Luis Romero | Universidad Autonoma de Baja California (original) (raw)
Papers by Luis Romero
Physiologia Plantarum, 1999
In view of the essential role of phenolic compounds in the with only carb, and six combinations o... more In view of the essential role of phenolic compounds in the with only carb, and six combinations of carb with each development of pathogen resistance in plants, and given the concentration of B. The results indicated that the foliar influence that fungicides and boron (B) exert over phenolic application with carb alone led to increases in phenylalanine metabolism, the aim of the present study was to determine the ammonia-lyase (PAL; EC 4.3.1.5) activity and a foliar accumulation of phenols. This effect of the carb alone could signify individual effect of the application of a fungicide, as well as to an additional tolerance mechanism to pathogenic infection, determine the joint effect of the fungicide and B on the given the participation of phenolic compounds in the lignifica-metabolism of phenolic compounds in tobacco plants (Nicotion of plant cell walls. The joint application of carb and B tiana tabacum L. cv. Tennessee 86). The fungicide applied was increased both the biosynthesis and the oxidation of the carbendazim (carb), a preventative fungicide, with a purity of phenolic compounds, especially in carb plus B 3 , while the 100% at a concentration of 2.6 mM. Boron was applied in the form of H 3 BO 3 at: 1.6 mM (B 1 ), 4 mM (B 2 ), 8 mM (B 3 ), 16
Physiologia Plantarum, 2003
Tmknvf 2 ) and grafted tomato plants (L. esculentum L. cv. Tmknvf 2 ¿ L. esculentum L. cv. RX-335... more Tmknvf 2 ) and grafted tomato plants (L. esculentum L. cv. Tmknvf 2 ¿ L. esculentum L. cv. RX-335) were grown for 30 days at three different temperatures (10aeC, 25aeC and 35aeC). In the leaves of these plants, the enzymatic activities of SOD, GPX, CAT, APX, DHAR and GR were analysed, as were the concentrations of total H 2 O 2 , ascorbate and glutathione as well as foliar DW. Regardless of whether the plant was grafted or not, our results indicate that the thermal stress occurred
Environmental and Experimental Botany, 2005
In the present work, in order to identify the most reliable nutritional and biochemical indicator... more In the present work, in order to identify the most reliable nutritional and biochemical indicators for improving salt tolerance in one of the most important horticultural crops worldwide tomato, 10 commercial cultivars were subjected to salinity stress. Here, we show that the most salt-resistant tomato cultivars (cv. Brillante and cv. Jaguar) are characterized by reduced uptake and foliar accumulation of Na + and Cl − , increased K + uptake, and greater synthesis of sucrose, carotenoids, and thiol groups, with the consequent reduction in lipid peroxidation and therefore, oxidative damage; all this translates as greater biomass production in the two cultivars with respect to the other tomato cultivars examined. In addition, our results reveal the validity and effectiveness of certain nutritional and biochemical indicators of salt stress, such as the K + :Na + ratio and sucrose, indicating the importance of lipid peroxidation as the determinant physiological process in the selection of salinity-tolerant tomato plants.
Plant Science, 2001
Tomato plants, Lycopersicon esculentum L. cv. Tmknvf 2 , and watermelon plants, Citrullus lanatus... more Tomato plants, Lycopersicon esculentum L. cv. Tmknvf 2 , and watermelon plants, Citrullus lanatus [Thomb.] Mansf. cv. Dulce maravilla, were grown for 30 days at different temperatures (15, 25 and 35°C). We analysed soluble phenolics, enzymatic activities (phenylalanine ammonia-lyase, polyphenol oxidase and peroxidase), and dry weight. The impact of the three temperatures was different in tomato and watermelon. Our results indicate that heat stress in tomato plants occurred at 35°C, while chilling stress occurred in watermelon plants at 15°C. Thermal stress in both plants caused: (1) decreased shoot weight; (2) accumulation of soluble phenolics; (3) highest phenylalanine ammonia-lyase activity; and (4) lowest peroxidase and polyphenol oxidase activity. These results indicate that thermal stress induces the accumulation of phenolics in the plant by activating their biosynthesis as well as inhibiting their oxidation. This could be considered an acclimation mechanism of the plant against thermal stress.
Journal of Agricultural and Food Chemistry, 1998
Twelve different tomato (Lycopersicum esculentum Mill.) genotypes were grown in a controlled gree... more Twelve different tomato (Lycopersicum esculentum Mill.) genotypes were grown in a controlled greenhouse to determine the influence of genotype variation on the efficiency of nitrogen utilization and fruit yield. The results showed that the variation of genotype in tomatoes influences the utilization and assimilation of foliar NO 3 -. The genotypes that proved highly efficient in this utilization were G7, G9, G11, and G12. These genotypes had the highest foliar NO 3concentrations, greatest nitrate reductase activities, and highest protein and organic nitrogen contents. Genotype also influenced marketable and nonmarketable yields. Genotypes G2, G3, G6, and G8, which ranked intermediate in the efficient utilization of N, had the highest marketable and lowest nonmarketable yields.
Phytochemistry, 1998
Key Word Index--Nictiana tabacum; Solanaceae; tobacco; boron; phenol content and metabolism.
Phytochemistry, 2002
The aim of the present work was to examine the relationship between proline metabolism and NAD ki... more The aim of the present work was to examine the relationship between proline metabolism and NAD kinase activity in greenbeans submitted to cold-shock. For this, 15-day-old greenbean plants were subjected to a temperature of 4 C (cold shock) for 180 min. Our results indicate that the plants showed foliar accumulation of proline, with the enzymes ornithine-d-aminotransferase (OAT) and proline dehydrogenase (PDH) appearing as determinant in this accumulation under cold-shock. Also, we found a close relationship between the Ca 2+ -CaM-dependent NAD kinase activity and proline metabolism, suggesting that the adaptive responses or acclimation of plants to cold stress are preceded by increased [Ca 2+ ] cyt . #
Journal of Agricultural and Food Chemistry, 1997
Physiologia Plantarum, 1999
In view of the essential role of phenolic compounds in the with only carb, and six combinations o... more In view of the essential role of phenolic compounds in the with only carb, and six combinations of carb with each development of pathogen resistance in plants, and given the concentration of B. The results indicated that the foliar influence that fungicides and boron (B) exert over phenolic application with carb alone led to increases in phenylalanine metabolism, the aim of the present study was to determine the ammonia-lyase (PAL; EC 4.3.1.5) activity and a foliar accumulation of phenols. This effect of the carb alone could signify individual effect of the application of a fungicide, as well as to an additional tolerance mechanism to pathogenic infection, determine the joint effect of the fungicide and B on the given the participation of phenolic compounds in the lignifica-metabolism of phenolic compounds in tobacco plants (Nicotion of plant cell walls. The joint application of carb and B tiana tabacum L. cv. Tennessee 86). The fungicide applied was increased both the biosynthesis and the oxidation of the carbendazim (carb), a preventative fungicide, with a purity of phenolic compounds, especially in carb plus B 3 , while the 100% at a concentration of 2.6 mM. Boron was applied in the form of H 3 BO 3 at: 1.6 mM (B 1 ), 4 mM (B 2 ), 8 mM (B 3 ), 16
Physiologia Plantarum, 2003
Tmknvf 2 ) and grafted tomato plants (L. esculentum L. cv. Tmknvf 2 ¿ L. esculentum L. cv. RX-335... more Tmknvf 2 ) and grafted tomato plants (L. esculentum L. cv. Tmknvf 2 ¿ L. esculentum L. cv. RX-335) were grown for 30 days at three different temperatures (10aeC, 25aeC and 35aeC). In the leaves of these plants, the enzymatic activities of SOD, GPX, CAT, APX, DHAR and GR were analysed, as were the concentrations of total H 2 O 2 , ascorbate and glutathione as well as foliar DW. Regardless of whether the plant was grafted or not, our results indicate that the thermal stress occurred
Environmental and Experimental Botany, 2005
In the present work, in order to identify the most reliable nutritional and biochemical indicator... more In the present work, in order to identify the most reliable nutritional and biochemical indicators for improving salt tolerance in one of the most important horticultural crops worldwide tomato, 10 commercial cultivars were subjected to salinity stress. Here, we show that the most salt-resistant tomato cultivars (cv. Brillante and cv. Jaguar) are characterized by reduced uptake and foliar accumulation of Na + and Cl − , increased K + uptake, and greater synthesis of sucrose, carotenoids, and thiol groups, with the consequent reduction in lipid peroxidation and therefore, oxidative damage; all this translates as greater biomass production in the two cultivars with respect to the other tomato cultivars examined. In addition, our results reveal the validity and effectiveness of certain nutritional and biochemical indicators of salt stress, such as the K + :Na + ratio and sucrose, indicating the importance of lipid peroxidation as the determinant physiological process in the selection of salinity-tolerant tomato plants.
Plant Science, 2001
Tomato plants, Lycopersicon esculentum L. cv. Tmknvf 2 , and watermelon plants, Citrullus lanatus... more Tomato plants, Lycopersicon esculentum L. cv. Tmknvf 2 , and watermelon plants, Citrullus lanatus [Thomb.] Mansf. cv. Dulce maravilla, were grown for 30 days at different temperatures (15, 25 and 35°C). We analysed soluble phenolics, enzymatic activities (phenylalanine ammonia-lyase, polyphenol oxidase and peroxidase), and dry weight. The impact of the three temperatures was different in tomato and watermelon. Our results indicate that heat stress in tomato plants occurred at 35°C, while chilling stress occurred in watermelon plants at 15°C. Thermal stress in both plants caused: (1) decreased shoot weight; (2) accumulation of soluble phenolics; (3) highest phenylalanine ammonia-lyase activity; and (4) lowest peroxidase and polyphenol oxidase activity. These results indicate that thermal stress induces the accumulation of phenolics in the plant by activating their biosynthesis as well as inhibiting their oxidation. This could be considered an acclimation mechanism of the plant against thermal stress.
Journal of Agricultural and Food Chemistry, 1998
Twelve different tomato (Lycopersicum esculentum Mill.) genotypes were grown in a controlled gree... more Twelve different tomato (Lycopersicum esculentum Mill.) genotypes were grown in a controlled greenhouse to determine the influence of genotype variation on the efficiency of nitrogen utilization and fruit yield. The results showed that the variation of genotype in tomatoes influences the utilization and assimilation of foliar NO 3 -. The genotypes that proved highly efficient in this utilization were G7, G9, G11, and G12. These genotypes had the highest foliar NO 3concentrations, greatest nitrate reductase activities, and highest protein and organic nitrogen contents. Genotype also influenced marketable and nonmarketable yields. Genotypes G2, G3, G6, and G8, which ranked intermediate in the efficient utilization of N, had the highest marketable and lowest nonmarketable yields.
Phytochemistry, 1998
Key Word Index--Nictiana tabacum; Solanaceae; tobacco; boron; phenol content and metabolism.
Phytochemistry, 2002
The aim of the present work was to examine the relationship between proline metabolism and NAD ki... more The aim of the present work was to examine the relationship between proline metabolism and NAD kinase activity in greenbeans submitted to cold-shock. For this, 15-day-old greenbean plants were subjected to a temperature of 4 C (cold shock) for 180 min. Our results indicate that the plants showed foliar accumulation of proline, with the enzymes ornithine-d-aminotransferase (OAT) and proline dehydrogenase (PDH) appearing as determinant in this accumulation under cold-shock. Also, we found a close relationship between the Ca 2+ -CaM-dependent NAD kinase activity and proline metabolism, suggesting that the adaptive responses or acclimation of plants to cold stress are preceded by increased [Ca 2+ ] cyt . #
Journal of Agricultural and Food Chemistry, 1997
Physiologia Plantarum, 1999
In view of the essential role of phenolic compounds in the with only carb, and six combinations o... more In view of the essential role of phenolic compounds in the with only carb, and six combinations of carb with each development of pathogen resistance in plants, and given the concentration of B. The results indicated that the foliar influence that fungicides and boron (B) exert over phenolic application with carb alone led to increases in phenylalanine metabolism, the aim of the present study was to determine the ammonia-lyase (PAL; EC 4.3.1.5) activity and a foliar accumulation of phenols. This effect of the carb alone could signify individual effect of the application of a fungicide, as well as to an additional tolerance mechanism to pathogenic infection, determine the joint effect of the fungicide and B on the given the participation of phenolic compounds in the lignifica-metabolism of phenolic compounds in tobacco plants (Nicotion of plant cell walls. The joint application of carb and B tiana tabacum L. cv. Tennessee 86). The fungicide applied was increased both the biosynthesis and the oxidation of the carbendazim (carb), a preventative fungicide, with a purity of phenolic compounds, especially in carb plus B 3 , while the 100% at a concentration of 2.6 mM. Boron was applied in the form of H 3 BO 3 at: 1.6 mM (B 1 ), 4 mM (B 2 ), 8 mM (B 3 ), 16
Physiologia Plantarum, 2003
Tmknvf 2 ) and grafted tomato plants (L. esculentum L. cv. Tmknvf 2 ¿ L. esculentum L. cv. RX-335... more Tmknvf 2 ) and grafted tomato plants (L. esculentum L. cv. Tmknvf 2 ¿ L. esculentum L. cv. RX-335) were grown for 30 days at three different temperatures (10aeC, 25aeC and 35aeC). In the leaves of these plants, the enzymatic activities of SOD, GPX, CAT, APX, DHAR and GR were analysed, as were the concentrations of total H 2 O 2 , ascorbate and glutathione as well as foliar DW. Regardless of whether the plant was grafted or not, our results indicate that the thermal stress occurred
Environmental and Experimental Botany, 2005
In the present work, in order to identify the most reliable nutritional and biochemical indicator... more In the present work, in order to identify the most reliable nutritional and biochemical indicators for improving salt tolerance in one of the most important horticultural crops worldwide tomato, 10 commercial cultivars were subjected to salinity stress. Here, we show that the most salt-resistant tomato cultivars (cv. Brillante and cv. Jaguar) are characterized by reduced uptake and foliar accumulation of Na + and Cl − , increased K + uptake, and greater synthesis of sucrose, carotenoids, and thiol groups, with the consequent reduction in lipid peroxidation and therefore, oxidative damage; all this translates as greater biomass production in the two cultivars with respect to the other tomato cultivars examined. In addition, our results reveal the validity and effectiveness of certain nutritional and biochemical indicators of salt stress, such as the K + :Na + ratio and sucrose, indicating the importance of lipid peroxidation as the determinant physiological process in the selection of salinity-tolerant tomato plants.
Plant Science, 2001
Tomato plants, Lycopersicon esculentum L. cv. Tmknvf 2 , and watermelon plants, Citrullus lanatus... more Tomato plants, Lycopersicon esculentum L. cv. Tmknvf 2 , and watermelon plants, Citrullus lanatus [Thomb.] Mansf. cv. Dulce maravilla, were grown for 30 days at different temperatures (15, 25 and 35°C). We analysed soluble phenolics, enzymatic activities (phenylalanine ammonia-lyase, polyphenol oxidase and peroxidase), and dry weight. The impact of the three temperatures was different in tomato and watermelon. Our results indicate that heat stress in tomato plants occurred at 35°C, while chilling stress occurred in watermelon plants at 15°C. Thermal stress in both plants caused: (1) decreased shoot weight; (2) accumulation of soluble phenolics; (3) highest phenylalanine ammonia-lyase activity; and (4) lowest peroxidase and polyphenol oxidase activity. These results indicate that thermal stress induces the accumulation of phenolics in the plant by activating their biosynthesis as well as inhibiting their oxidation. This could be considered an acclimation mechanism of the plant against thermal stress.
Journal of Agricultural and Food Chemistry, 1998
Twelve different tomato (Lycopersicum esculentum Mill.) genotypes were grown in a controlled gree... more Twelve different tomato (Lycopersicum esculentum Mill.) genotypes were grown in a controlled greenhouse to determine the influence of genotype variation on the efficiency of nitrogen utilization and fruit yield. The results showed that the variation of genotype in tomatoes influences the utilization and assimilation of foliar NO 3 -. The genotypes that proved highly efficient in this utilization were G7, G9, G11, and G12. These genotypes had the highest foliar NO 3concentrations, greatest nitrate reductase activities, and highest protein and organic nitrogen contents. Genotype also influenced marketable and nonmarketable yields. Genotypes G2, G3, G6, and G8, which ranked intermediate in the efficient utilization of N, had the highest marketable and lowest nonmarketable yields.
Phytochemistry, 1998
Key Word Index--Nictiana tabacum; Solanaceae; tobacco; boron; phenol content and metabolism.
Phytochemistry, 2002
The aim of the present work was to examine the relationship between proline metabolism and NAD ki... more The aim of the present work was to examine the relationship between proline metabolism and NAD kinase activity in greenbeans submitted to cold-shock. For this, 15-day-old greenbean plants were subjected to a temperature of 4 C (cold shock) for 180 min. Our results indicate that the plants showed foliar accumulation of proline, with the enzymes ornithine-d-aminotransferase (OAT) and proline dehydrogenase (PDH) appearing as determinant in this accumulation under cold-shock. Also, we found a close relationship between the Ca 2+ -CaM-dependent NAD kinase activity and proline metabolism, suggesting that the adaptive responses or acclimation of plants to cold stress are preceded by increased [Ca 2+ ] cyt . #
Journal of Agricultural and Food Chemistry, 1997
Physiologia Plantarum, 1999
In view of the essential role of phenolic compounds in the with only carb, and six combinations o... more In view of the essential role of phenolic compounds in the with only carb, and six combinations of carb with each development of pathogen resistance in plants, and given the concentration of B. The results indicated that the foliar influence that fungicides and boron (B) exert over phenolic application with carb alone led to increases in phenylalanine metabolism, the aim of the present study was to determine the ammonia-lyase (PAL; EC 4.3.1.5) activity and a foliar accumulation of phenols. This effect of the carb alone could signify individual effect of the application of a fungicide, as well as to an additional tolerance mechanism to pathogenic infection, determine the joint effect of the fungicide and B on the given the participation of phenolic compounds in the lignifica-metabolism of phenolic compounds in tobacco plants (Nicotion of plant cell walls. The joint application of carb and B tiana tabacum L. cv. Tennessee 86). The fungicide applied was increased both the biosynthesis and the oxidation of the carbendazim (carb), a preventative fungicide, with a purity of phenolic compounds, especially in carb plus B 3 , while the 100% at a concentration of 2.6 mM. Boron was applied in the form of H 3 BO 3 at: 1.6 mM (B 1 ), 4 mM (B 2 ), 8 mM (B 3 ), 16
Physiologia Plantarum, 2003
Tmknvf 2 ) and grafted tomato plants (L. esculentum L. cv. Tmknvf 2 ¿ L. esculentum L. cv. RX-335... more Tmknvf 2 ) and grafted tomato plants (L. esculentum L. cv. Tmknvf 2 ¿ L. esculentum L. cv. RX-335) were grown for 30 days at three different temperatures (10aeC, 25aeC and 35aeC). In the leaves of these plants, the enzymatic activities of SOD, GPX, CAT, APX, DHAR and GR were analysed, as were the concentrations of total H 2 O 2 , ascorbate and glutathione as well as foliar DW. Regardless of whether the plant was grafted or not, our results indicate that the thermal stress occurred
Environmental and Experimental Botany, 2005
In the present work, in order to identify the most reliable nutritional and biochemical indicator... more In the present work, in order to identify the most reliable nutritional and biochemical indicators for improving salt tolerance in one of the most important horticultural crops worldwide tomato, 10 commercial cultivars were subjected to salinity stress. Here, we show that the most salt-resistant tomato cultivars (cv. Brillante and cv. Jaguar) are characterized by reduced uptake and foliar accumulation of Na + and Cl − , increased K + uptake, and greater synthesis of sucrose, carotenoids, and thiol groups, with the consequent reduction in lipid peroxidation and therefore, oxidative damage; all this translates as greater biomass production in the two cultivars with respect to the other tomato cultivars examined. In addition, our results reveal the validity and effectiveness of certain nutritional and biochemical indicators of salt stress, such as the K + :Na + ratio and sucrose, indicating the importance of lipid peroxidation as the determinant physiological process in the selection of salinity-tolerant tomato plants.
Plant Science, 2001
Tomato plants, Lycopersicon esculentum L. cv. Tmknvf 2 , and watermelon plants, Citrullus lanatus... more Tomato plants, Lycopersicon esculentum L. cv. Tmknvf 2 , and watermelon plants, Citrullus lanatus [Thomb.] Mansf. cv. Dulce maravilla, were grown for 30 days at different temperatures (15, 25 and 35°C). We analysed soluble phenolics, enzymatic activities (phenylalanine ammonia-lyase, polyphenol oxidase and peroxidase), and dry weight. The impact of the three temperatures was different in tomato and watermelon. Our results indicate that heat stress in tomato plants occurred at 35°C, while chilling stress occurred in watermelon plants at 15°C. Thermal stress in both plants caused: (1) decreased shoot weight; (2) accumulation of soluble phenolics; (3) highest phenylalanine ammonia-lyase activity; and (4) lowest peroxidase and polyphenol oxidase activity. These results indicate that thermal stress induces the accumulation of phenolics in the plant by activating their biosynthesis as well as inhibiting their oxidation. This could be considered an acclimation mechanism of the plant against thermal stress.
Journal of Agricultural and Food Chemistry, 1998
Twelve different tomato (Lycopersicum esculentum Mill.) genotypes were grown in a controlled gree... more Twelve different tomato (Lycopersicum esculentum Mill.) genotypes were grown in a controlled greenhouse to determine the influence of genotype variation on the efficiency of nitrogen utilization and fruit yield. The results showed that the variation of genotype in tomatoes influences the utilization and assimilation of foliar NO 3 -. The genotypes that proved highly efficient in this utilization were G7, G9, G11, and G12. These genotypes had the highest foliar NO 3concentrations, greatest nitrate reductase activities, and highest protein and organic nitrogen contents. Genotype also influenced marketable and nonmarketable yields. Genotypes G2, G3, G6, and G8, which ranked intermediate in the efficient utilization of N, had the highest marketable and lowest nonmarketable yields.
Phytochemistry, 1998
Key Word Index--Nictiana tabacum; Solanaceae; tobacco; boron; phenol content and metabolism.
Phytochemistry, 2002
The aim of the present work was to examine the relationship between proline metabolism and NAD ki... more The aim of the present work was to examine the relationship between proline metabolism and NAD kinase activity in greenbeans submitted to cold-shock. For this, 15-day-old greenbean plants were subjected to a temperature of 4 C (cold shock) for 180 min. Our results indicate that the plants showed foliar accumulation of proline, with the enzymes ornithine-d-aminotransferase (OAT) and proline dehydrogenase (PDH) appearing as determinant in this accumulation under cold-shock. Also, we found a close relationship between the Ca 2+ -CaM-dependent NAD kinase activity and proline metabolism, suggesting that the adaptive responses or acclimation of plants to cold stress are preceded by increased [Ca 2+ ] cyt . #
Journal of Agricultural and Food Chemistry, 1997