BIOLOGY 2D03 Lecture Notes - Lecture 7: Aerenchyma, Leaf, Stoma
2 Nov 2016
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Document Summary
Abiotic stress (some plants have adaptations: light, high temperature, water deficit, salt stress, cold, anaerobic stress, oxidative stress, can severely effect crops. Adaptations: constitutive mechanisms for tolerating or resisting stress, ex. cactus water deficit tolerant due to barrel-shaped stem, reduced surface area. Induced mechanisms for stress: ex. spinach tolerance to drought by accumulation of osmoprotective compounds, response to drought, saline soils, and cold/freezing are similar because each plant is exposed to a water deficit. K outward channel: increases out flow of k from cell, therefore water potential inside cell is greater than outside, therefore water flows out of guard cells, decreases turgor pressure guard cells close, stomata close. Found that transgenic rice grew well under water stress compared to wt. Osmolytes: accumulate compatible solutes = osmolytes to maintain water content, this lowers water potential in cells and allows for increased water uptake, called compatible solutes because they don"t interfere with cell structure and function, process, 1.
