Gurpreet Virk - Academia.edu (original) (raw)
Papers by Gurpreet Virk
Peanut Science, 2019
Selecting planting dates with optimal temperatures for plant growth and development is important ... more Selecting planting dates with optimal temperatures for plant growth and development is important for successful crop production. Photosynthetic rates of peanut leaves under adverse environmental conditions have been widely studied; however, characterization of photosynthetic efficiency of first true leaves as well as its contribution to plant growth is not well elucidated. The objectives of this research were to assess the influence of first true leaves of peanut cultivars on plant growth under different temperature conditions during early growth and at the onset of flowering and to identify the photosynthetic components more closely linked with photosynthetic efficiency of the first true leaves. Experiments were conducted with April (early), May (optimum), and June (late) planting dates in 2017 and 2018. Cultivars Georgia-06G, Georgia-14N, and TifNV-High O/L were evaluated. Measurements were taken at three and five wks after planting, early season and the onset of flowering, respec...
Crop Science, 2020
Rapid development of the first true leaf has been suggested as a key driver of seedling vigor in ... more Rapid development of the first true leaf has been suggested as a key driver of seedling vigor in cotton, yet studies demonstrating an association between first true leaf physiological processes and early season cotton growth are limited. It was hypothesized that both first true leaf area (FTLA) and photosynthetic rates would be positively associated with cotton (Gossypium hirsutum and G. barbadense) seedling vigor, and that photosynthetic component processes would differ in their contribution to net photosynthesis (A n) of the first true leaf. To test these hypotheses, three different cotton cultivars were planted in the 2017 and 2018 seasons on three selected dates each year to generate broad differences in seedling vigor. Growth analysis was conducted to assess seedling vigor at 3 and 5 wk after planting, and a combination of dark-and light-adapted gas exchange and fluorescence measurements were performed on the first true leaf, concurrent with growth assessments. Seedling vigor was much more strongly associated with FTLA than A n on a per unit leaf area basis, suggesting that FTLA was a stronger indicator of seedling vigor. Correlation analysis between A n and a number of component processes derived from combined gas exchange and fluorescence measurements indicated that A n was strongly correlated with electron transport rates and stomatal conductance. However, we suggest that most of the variability we observed in A n of the first true leaf was primarily driven by nonstomatal factors, since no significant correlations between A n and chloroplast CO 2 concentration or substomatal CO 2 concentration was apparent. Abbreviations: A g , gross photosynthesis; A n , net photosynthesis; C c , CO 2 concentration in the chloroplast; C i , intercellular CO 2 concentration inside the leaf; DW, total dry weight; ETR a , electron transport rate to carbon assimilation; ETR p , electron transport to photorespiration; F s , fluorescence; FTLA, first true leaf area; g m , mesophyll conductance; g s , stomatal conductance; PAR, photosynthetically active radiation; R d , midday dark respiration; SVI, seedling vigor index; T leaf , leaf temperature; WAP, weeks after planting.
Agronomy Journal, 2020
Whole-crop growth at early season in peanuts (Arachis hypogaea L.) can be influenced by genotype,... more Whole-crop growth at early season in peanuts (Arachis hypogaea L.) can be influenced by genotype, management, and environmental conditions such as soil and air temperatures. To determine the effect of different planting conditions on peanut growth and vigor in the early season, modern peanut cultivars were planted in two growing seasons on 17 April, 10 May, and 5 June in 2017 and 25 April, 14 May, and 11 June in 2018 season, targeted to generate differences in temperature during early growth. Field measurements included emergence assessments and destructive harvest at 21 and 35 days after planting to quantify plant density, height, leaf area, and dry matter accumulation. Additionally, crop growth indices were calculated. Results showed that planting date and cultivar significantly affected plant growth parameters and derived growth indices. Planting in June resulted in greater growth parameters, crop growth rate, and leaf area index compared to April and May for both seasons. However, net assimilation rate was highest for May in 2017 and for June in 2018. Comparing cultivars, Georgia-06G and TifNV-high O/L were more vigorous than Georgia-14N. Average soil and air temperatures were the highest with June planting and produced more vigorous seedling growth and greater crop growth rates than planting in April and May. Furthermore, our results suggest that the differences in the early season crop growth of modern peanut cultivars were more strongly and closely associated with leaf area development rather than specific leaf activity, that is, net assimilation rate of the canopy.
Industrial Crops and Products
Peanut Science, 2019
Selecting planting dates with optimal temperatures for plant growth and development is important ... more Selecting planting dates with optimal temperatures for plant growth and development is important for successful crop production. Photosynthetic rates of peanut leaves under adverse environmental conditions have been widely studied; however, characterization of photosynthetic efficiency of first true leaves as well as its contribution to plant growth is not well elucidated. The objectives of this research were to assess the influence of first true leaves of peanut cultivars on plant growth under different temperature conditions during early growth and at the onset of flowering and to identify the photosynthetic components more closely linked with photosynthetic efficiency of the first true leaves. Experiments were conducted with April (early), May (optimum), and June (late) planting dates in 2017 and 2018. Cultivars Georgia-06G, Georgia-14N, and TifNV-High O/L were evaluated. Measurements were taken at three and five wks after planting, early season and the onset of flowering, respec...
Crop Science, 2020
Rapid development of the first true leaf has been suggested as a key driver of seedling vigor in ... more Rapid development of the first true leaf has been suggested as a key driver of seedling vigor in cotton, yet studies demonstrating an association between first true leaf physiological processes and early season cotton growth are limited. It was hypothesized that both first true leaf area (FTLA) and photosynthetic rates would be positively associated with cotton (Gossypium hirsutum and G. barbadense) seedling vigor, and that photosynthetic component processes would differ in their contribution to net photosynthesis (A n) of the first true leaf. To test these hypotheses, three different cotton cultivars were planted in the 2017 and 2018 seasons on three selected dates each year to generate broad differences in seedling vigor. Growth analysis was conducted to assess seedling vigor at 3 and 5 wk after planting, and a combination of dark-and light-adapted gas exchange and fluorescence measurements were performed on the first true leaf, concurrent with growth assessments. Seedling vigor was much more strongly associated with FTLA than A n on a per unit leaf area basis, suggesting that FTLA was a stronger indicator of seedling vigor. Correlation analysis between A n and a number of component processes derived from combined gas exchange and fluorescence measurements indicated that A n was strongly correlated with electron transport rates and stomatal conductance. However, we suggest that most of the variability we observed in A n of the first true leaf was primarily driven by nonstomatal factors, since no significant correlations between A n and chloroplast CO 2 concentration or substomatal CO 2 concentration was apparent. Abbreviations: A g , gross photosynthesis; A n , net photosynthesis; C c , CO 2 concentration in the chloroplast; C i , intercellular CO 2 concentration inside the leaf; DW, total dry weight; ETR a , electron transport rate to carbon assimilation; ETR p , electron transport to photorespiration; F s , fluorescence; FTLA, first true leaf area; g m , mesophyll conductance; g s , stomatal conductance; PAR, photosynthetically active radiation; R d , midday dark respiration; SVI, seedling vigor index; T leaf , leaf temperature; WAP, weeks after planting.
Agronomy Journal, 2020
Whole-crop growth at early season in peanuts (Arachis hypogaea L.) can be influenced by genotype,... more Whole-crop growth at early season in peanuts (Arachis hypogaea L.) can be influenced by genotype, management, and environmental conditions such as soil and air temperatures. To determine the effect of different planting conditions on peanut growth and vigor in the early season, modern peanut cultivars were planted in two growing seasons on 17 April, 10 May, and 5 June in 2017 and 25 April, 14 May, and 11 June in 2018 season, targeted to generate differences in temperature during early growth. Field measurements included emergence assessments and destructive harvest at 21 and 35 days after planting to quantify plant density, height, leaf area, and dry matter accumulation. Additionally, crop growth indices were calculated. Results showed that planting date and cultivar significantly affected plant growth parameters and derived growth indices. Planting in June resulted in greater growth parameters, crop growth rate, and leaf area index compared to April and May for both seasons. However, net assimilation rate was highest for May in 2017 and for June in 2018. Comparing cultivars, Georgia-06G and TifNV-high O/L were more vigorous than Georgia-14N. Average soil and air temperatures were the highest with June planting and produced more vigorous seedling growth and greater crop growth rates than planting in April and May. Furthermore, our results suggest that the differences in the early season crop growth of modern peanut cultivars were more strongly and closely associated with leaf area development rather than specific leaf activity, that is, net assimilation rate of the canopy.
Industrial Crops and Products