Desiccation Tolerance of Five Tropical Seedlings in Panama. Relationship to a Field Assessment of Drought perf ormancel (original) (raw)

Journal of Research in Plant Sciences

This is Volume 2 - Issue 2 of the Journal of Research in Plant Sciences. Plant Science or more appropriately referred to as Botanical science, is the branch of biological science that involves study of the morphology, anatomy, taxonomy and physiology of plants. It also includes study and analysis of molecular aspects of plant metabolic pathways, and the ecological relationships existing between various plants. In addition, plant sciences also include the study of basic concepts and applied aspects of experimental plant biology, genomics, proteomics, plant biochemistry, cell biology, evolutionary biology, functional plant breeding and systems biology. The current trends and future prospects of plant science research encompass the development of disease resistant plants through plant biotechnological innovations.

Effects of Water Stress on Respiration in Soybean Leaves

Plant Physiology, 2005

The effect of water stress on respiration and mitochondrial electron transport has been studied in soybean (Glycine max) leaves, using the oxygen-isotope-fractionation technique. Treatments with three levels of water stress were applied by irrigation to replace 100%, 50%, and 0% of daily water use by transpiration. The levels of water stress were characterized in terms of lightsaturated stomatal conductance (g s ): well irrigated (g s . 0.2 mol H 2 O m 22 s 21 ), mildly water stressed ( g s between 0.1 and 0.2 mol H 2 O m 22 s 21 ), and severely water stressed (g s , 0.1 mol H 2 O m 22 s 21 ). Although net photosynthesis decreased by 40% and 70% under mild and severe water stress, respectively, the total respiratory oxygen uptake (V t ) was not significantly different at any water-stress level. However, severe water stress caused a significant shift of electrons from the cytochrome to the alternative pathway. The electron partitioning through the alternative pathway increased from 10% to 12% under well-watered or mild water-stress conditions to near 40% under severe water stress. Consequently, the calculated rate of mitochondrial ATP synthesis decreased by 32% under severe water stress. Unlike many other stresses, water stress did not affect the levels of mitochondrial alternative oxidase protein. This suggests a biochemical regulation (other than protein synthesis) that causes this mitochondrial electron shift. fax 34-971-173184.

Journal of Research in Plant Sciences - Volume 3 Issue 1.pdf

This is Volume 3 - Issue 1 of the Journal of Research in Plant Sciences. Plant Science or more appropriately referred to as Botanical science, is the branch of biological science that involves study of the morphology, anatomy, taxonomy and physiology of plants. It also includes study and analysis of molecular aspects of plant metabolic pathways, and the ecological relationships existing between various plants. In addition, plant sciences also include the study of basic concepts and applied aspects of experimental plant biology, genomics, proteomics, plant biochemistry, cell biology, evolutionary biology, functional plant breeding and systems biology. The current trends and future prospects of plant science research encompass the development of disease resistant plants through plant biotechnological innovations.