Lec10TranspirationAndWaterStress

Water stress water stress effects on physiological

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Unformatted text preview: fects on physiological processes • Plant adaptations to water stress • Benefits Water Stress Water Stress • Effects on physiological processes – Cell growth (enlargement) • Reduced turgor pressure • Membrane disruption • Reduced cell wall synthesis Water Stress Water Stress • Effects on physiological processes Sunflower – Cell growth (enlargement) • Leaf expansion m = slope of these lines the leaf growht of some plant is high when the turgor pressure is high. Water Stress Water Stress • Effects on physiological processes – Cell growth (enlargement) • Leaf expansion as you increase the size of the tree, the leaves get smaller, bc the water potential is around negative, but for he 2 meter tree the water potential is bigger than one and higehr trugor pressure./ http://eebweb.arizona.edu/faculty/huxman/ Water Stress Water Stress • Effects on physiological processes Sunflower – Leaf expansion – Photosynthesis Water Stress Water Stress • Effects on physiological processes • Protein synthesis – Reduced membrane function • Reduced synthesis of chlorophyll • Reduced nitrate reductase – Reduced root functioning Water Stress Water Stress as the stomata closes it prevents photosynthesis, bc CO2 cannot get into leaf. • Effects on physiological processes – Stomatal closure • Indirectly affects photosynthesis • Role of Abscisic acid (ABA) – Solute loss from guard cell can be triggered by ABA – Reduced CO2 assimilation Water Stress Cav...
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This document was uploaded on 01/17/2014.

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