Mamdouh M. Nemat Alla
Department of Botany, Faculty of Science at Damietta, Mansoura University, Damietta, Egypt
Mahmoud E. Younis
Department of Botany, Faculty of Science at Damietta, Mansoura University, Damietta, Egypt
Omar A. El-shihaby
Department of Botany, Faculty of Science at Damietta, Mansoura University, Damietta, Egypt
Zeinab M. El-Bastawisy
Department of Botany, Faculty of Science at Damietta, Mansoura University, Damietta, Egypt
ABSTRACT
Waterlogging decreased carotenoids content of Vigna sinensis and Zea mays whilst salinity provoked increases in former and decreases in later. Both treatments showed significant reductions in chlorophylls content and in photosynthetic activity (Hill reaction and 14CO2-light fixation). A significant decrease in the activity of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) was detected in both plants. These reductions could result in losses in photosynthetic activity with a drop in the net formation of carbohydrates. Waterlogging markedly increased glucose and sucrose in shoots and roots of both plants throughout the experimental period but greatly decreased polysaccharides, whilst salinity reduced all carbohydrate fractions. Foliar application of 50 ppm kinetin to treated plants mostly counterbalanced the observed changes in pigments as well as in Hill reaction and 14CO2 assimilation. Also kinetin rendered levels of carbohydrate fractions in shoots and roots of treated plants and activity of Rubisco most likely to reach control values. The increased levels of glucose and sucrose concomitant with decreased polysaccharides might point to a block in their transport rather than from an over production. Kinetin counterbalanced the effects of waterlogging or salinity on photosynthetic activity, probably through more production of enzyme and/or delay of senescence.
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How to cite this article
Mamdouh M. Nemat Alla, Mahmoud E. Younis, Omar A. El-shihaby and Zeinab M. El-Bastawisy, 2001. Effect of Kinetin on Photosynthetic Activity and Carbohydrate Content in
Waterlogged or Seawater Treated Vigna sinensis and Zea mays. Journal of Biological Sciences, 1: 918-924.
DOI: 10.3923/jbs.2001.918.924
URL: https://scialert.net/abstract/?doi=jbs.2001.918.924
DOI: 10.3923/jbs.2001.918.924
URL: https://scialert.net/abstract/?doi=jbs.2001.918.924
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