Yaser Dewir | Kafrelsheikh University (original) (raw)
Papers by Yaser Dewir
Acta Horticulturae, 2007
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ABSTRACT Large-scale liquid cultures and automation have proven the potential to resolve manual h... more ABSTRACT Large-scale liquid cultures and automation have proven the potential to resolve manual handling of in vitro cultures at various stages and decreases production cost. However, hyperhydricity is a major problem during in vitro culture of many crops in liquid culture systems. The environment inside culture vessel normally used in plant micropropagation is characterized by high humidity, limited gaseous exchange between the internal atmosphere of the culture vessel and its surrounding environment, and the accumulation of ethylene, conditions that may induce physiological disorders. Hyperhydricity is a disorder of tissue-cultured plants where leaves become translucent and stems swollen, distorted and brittle. Although numerous hypotheses have been put forward to explain hyperhydricity but there is still a lack of knowledge about the nature of signals responsible for hyperhydricity and the metabolic processes which are affected by its development. The concept of stress in relation to hyperhydricity is not completely established. Therefore, it remains difficult to assume that hyperhydric tissues are stressed. Previous studies argued that abnormal morphology observed in hyperhydricity could be attributed to changes occurring at cellular level due to the modifications of membrane composition or DNA content. In order to understand stress and morphological responses in hyperhydric tissues, in the present article, we are reviewing different biochemical and physiological mechanisms of hyperhydricity in several plant species.
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Acta Biologica Szegediensis, 2007
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Horticulture Environment and Biotechnology, 2005
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Acta Horticulturae, 2007
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Acta Horticulturae, 2006
ABSTRACT
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Wonye kwahak kisulchi = Korean journal of horticultural science and technology /
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ABSTRACT
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Wonye kwahak kisulchi = Korean journal of horticultural science and technology /
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Australian Journal of Crop Science
Asparagus (Asparagus officinalis L) is considered as a vegetable rich in antioxidants. The presen... more Asparagus (Asparagus officinalis L) is considered as a vegetable rich in antioxidants. The present study investigated and compared the weight loss and degradation of antioxidants including ascorbic acid (ASC), glutathione (GSH) and cysteine (CYS) in spears of five asparagus cultivars (Bonlim, Eposs, Mars, Thielim and Vulkan). Spears were stored either under cold storage at 4 °C for 12 days or were deep frozen at - 20 °C for 12 months. The results showed that there are significant differences among asparagus cultivars with respect to their weight loss and antioxidants content of ASC, GSH and CYS. Weight loss and degradation of antioxidants were increased with increasing storage duration. At the end of 12 days period of cold storage, the cultivar Eposs showed the highest weight loss with 3.14%, while for the cultivar Vulkan, the lowest weight loss with 2.14% was recorded. When spears were deep frozen, the weight loss was lower than that recorded under cold storage. After 6 months of s...
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Floral transition is a complex biological event in the life cycle of flowering plants. In vitro c... more Floral transition is a complex biological event in the life cycle of flowering plants. In vitro culture techniques have important applications towards understanding the flowering process. A single parameter can be investigated to assess its effect on flowering. Investigations on this nature have focused upon the manipulation of media components and culture conditions. Approximately eight decades of in vitro flowering research has been conducted, however, it is difficult to predict how and when flower is to be initiated. This chapter describes various factors controlling in vitro flowering with emphasis on recent findings. The reviewed studies show that in vitro flowering can provide a model system for studying the “switch-on” flowering mechanism and provide means for conducting in vitro breeding. In addition, other applications include; production of early flowering pot plants for commercial market as well as test tube bouquets. The focus of this chapter highlights the relationship ...
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PROPAGATION OF ORNAMENTAL PLANTS
African violet (Saintpaulia ionantha H. Wendl) is one of the most easily and commonly tissue-cult... more African violet (Saintpaulia ionantha H. Wendl) is one of the most easily and commonly tissue-cultured ornamental plants. Despite this, there are limited reports on the direct adventitious shoots from any organ, most papers reporting on an indirect route through callus. In this study, adventitious shoots were induced directly from leaf and petiole explants from in vitro plantlets derived from shoot tip culture. Murashige and Skoog (MS) medium supplemented with 0.2 mg l-1 6-benzyladenine and 0.1 mg l-1 kinetin resulted in 91.65% direct shoot formation from leaf explants and 70% from petiole explants while 32.5 and 17.5 shoots formed per leaf and petiole explant, respectively. The origin of shoots was histologically demonstrated. The potential role of antioxidant enzymes in protecting hyperhydric plantlets from oxidative injury was examined by analyzing antioxidant enzyme activities of hyperhydric and normal tissues. Activities of catalase (CAT), peroxidase (POD), polyphenol oxidase (P...
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Production of Biomass and Bioactive Compounds Using Bioreactor Technology, 2014
ABSTRACT Large-scale liquid cultures and automation have proven the potential to resolve manual h... more ABSTRACT Large-scale liquid cultures and automation have proven the potential to resolve manual handling of in vitro cultures at various stages and decreases production cost. However, hyperhydricity is a major problem during in vitro culture of many crops in liquid culture systems. The environment inside culture vessel normally used in plant micropropagation is characterized by high humidity, limited gaseous exchange between the internal atmosphere of the culture vessel and its surrounding environment, and the accumulation of ethylene, conditions that may induce physiological disorders. Hyperhydricity is a disorder of tissue-cultured plants where leaves become translucent and stems swollen, distorted and brittle. Although numerous hypotheses have been put forward to explain hyperhydricity but there is still a lack of knowledge about the nature of signals responsible for hyperhydricity and the metabolic processes which are affected by its development. The concept of stress in relation to hyperhydricity is not completely established. Therefore, it remains difficult to assume that hyperhydric tissues are stressed. Previous studies argued that abnormal morphology observed in hyperhydricity could be attributed to changes occurring at cellular level due to the modifications of membrane composition or DNA content. In order to understand stress and morphological responses in hyperhydric tissues, in the present article, we are reviewing different biochemical and physiological mechanisms of hyperhydricity in several plant species.
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South African Journal of Botany, 2015
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Acta Horticulturae, 2007
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ABSTRACT Large-scale liquid cultures and automation have proven the potential to resolve manual h... more ABSTRACT Large-scale liquid cultures and automation have proven the potential to resolve manual handling of in vitro cultures at various stages and decreases production cost. However, hyperhydricity is a major problem during in vitro culture of many crops in liquid culture systems. The environment inside culture vessel normally used in plant micropropagation is characterized by high humidity, limited gaseous exchange between the internal atmosphere of the culture vessel and its surrounding environment, and the accumulation of ethylene, conditions that may induce physiological disorders. Hyperhydricity is a disorder of tissue-cultured plants where leaves become translucent and stems swollen, distorted and brittle. Although numerous hypotheses have been put forward to explain hyperhydricity but there is still a lack of knowledge about the nature of signals responsible for hyperhydricity and the metabolic processes which are affected by its development. The concept of stress in relation to hyperhydricity is not completely established. Therefore, it remains difficult to assume that hyperhydric tissues are stressed. Previous studies argued that abnormal morphology observed in hyperhydricity could be attributed to changes occurring at cellular level due to the modifications of membrane composition or DNA content. In order to understand stress and morphological responses in hyperhydric tissues, in the present article, we are reviewing different biochemical and physiological mechanisms of hyperhydricity in several plant species.
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Acta Biologica Szegediensis, 2007
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Horticulture Environment and Biotechnology, 2005
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
RefDoc Bienvenue - Welcome. Refdoc est un service / is powered by. ...
Bookmarks Related papers MentionsView impact
Acta Horticulturae, 2007
Bookmarks Related papers MentionsView impact
Acta Horticulturae, 2006
ABSTRACT
Bookmarks Related papers MentionsView impact
Wonye kwahak kisulchi = Korean journal of horticultural science and technology /
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
ABSTRACT
Bookmarks Related papers MentionsView impact
Wonye kwahak kisulchi = Korean journal of horticultural science and technology /
Bookmarks Related papers MentionsView impact
Australian Journal of Crop Science
Asparagus (Asparagus officinalis L) is considered as a vegetable rich in antioxidants. The presen... more Asparagus (Asparagus officinalis L) is considered as a vegetable rich in antioxidants. The present study investigated and compared the weight loss and degradation of antioxidants including ascorbic acid (ASC), glutathione (GSH) and cysteine (CYS) in spears of five asparagus cultivars (Bonlim, Eposs, Mars, Thielim and Vulkan). Spears were stored either under cold storage at 4 °C for 12 days or were deep frozen at - 20 °C for 12 months. The results showed that there are significant differences among asparagus cultivars with respect to their weight loss and antioxidants content of ASC, GSH and CYS. Weight loss and degradation of antioxidants were increased with increasing storage duration. At the end of 12 days period of cold storage, the cultivar Eposs showed the highest weight loss with 3.14%, while for the cultivar Vulkan, the lowest weight loss with 2.14% was recorded. When spears were deep frozen, the weight loss was lower than that recorded under cold storage. After 6 months of s...
Bookmarks Related papers MentionsView impact
Floral transition is a complex biological event in the life cycle of flowering plants. In vitro c... more Floral transition is a complex biological event in the life cycle of flowering plants. In vitro culture techniques have important applications towards understanding the flowering process. A single parameter can be investigated to assess its effect on flowering. Investigations on this nature have focused upon the manipulation of media components and culture conditions. Approximately eight decades of in vitro flowering research has been conducted, however, it is difficult to predict how and when flower is to be initiated. This chapter describes various factors controlling in vitro flowering with emphasis on recent findings. The reviewed studies show that in vitro flowering can provide a model system for studying the “switch-on” flowering mechanism and provide means for conducting in vitro breeding. In addition, other applications include; production of early flowering pot plants for commercial market as well as test tube bouquets. The focus of this chapter highlights the relationship ...
Bookmarks Related papers MentionsView impact
PROPAGATION OF ORNAMENTAL PLANTS
African violet (Saintpaulia ionantha H. Wendl) is one of the most easily and commonly tissue-cult... more African violet (Saintpaulia ionantha H. Wendl) is one of the most easily and commonly tissue-cultured ornamental plants. Despite this, there are limited reports on the direct adventitious shoots from any organ, most papers reporting on an indirect route through callus. In this study, adventitious shoots were induced directly from leaf and petiole explants from in vitro plantlets derived from shoot tip culture. Murashige and Skoog (MS) medium supplemented with 0.2 mg l-1 6-benzyladenine and 0.1 mg l-1 kinetin resulted in 91.65% direct shoot formation from leaf explants and 70% from petiole explants while 32.5 and 17.5 shoots formed per leaf and petiole explant, respectively. The origin of shoots was histologically demonstrated. The potential role of antioxidant enzymes in protecting hyperhydric plantlets from oxidative injury was examined by analyzing antioxidant enzyme activities of hyperhydric and normal tissues. Activities of catalase (CAT), peroxidase (POD), polyphenol oxidase (P...
Bookmarks Related papers MentionsView impact
Production of Biomass and Bioactive Compounds Using Bioreactor Technology, 2014
ABSTRACT Large-scale liquid cultures and automation have proven the potential to resolve manual h... more ABSTRACT Large-scale liquid cultures and automation have proven the potential to resolve manual handling of in vitro cultures at various stages and decreases production cost. However, hyperhydricity is a major problem during in vitro culture of many crops in liquid culture systems. The environment inside culture vessel normally used in plant micropropagation is characterized by high humidity, limited gaseous exchange between the internal atmosphere of the culture vessel and its surrounding environment, and the accumulation of ethylene, conditions that may induce physiological disorders. Hyperhydricity is a disorder of tissue-cultured plants where leaves become translucent and stems swollen, distorted and brittle. Although numerous hypotheses have been put forward to explain hyperhydricity but there is still a lack of knowledge about the nature of signals responsible for hyperhydricity and the metabolic processes which are affected by its development. The concept of stress in relation to hyperhydricity is not completely established. Therefore, it remains difficult to assume that hyperhydric tissues are stressed. Previous studies argued that abnormal morphology observed in hyperhydricity could be attributed to changes occurring at cellular level due to the modifications of membrane composition or DNA content. In order to understand stress and morphological responses in hyperhydric tissues, in the present article, we are reviewing different biochemical and physiological mechanisms of hyperhydricity in several plant species.
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South African Journal of Botany, 2015
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