Biology 2601A/B Lecture 17: bio 2601 LECTURE 17 Water and Nutrient Absorption 1

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Water and nutrient a(cid:271)sorption 1: root stru(cid:272)ture and fun(cid:272)tion. If there are no ways to mitigate drought stress, will die off. Just behind quiescent center upwards: rapid cell division where growth happens. Zones of the root: meristematic zone: very tip of the root which is actively being pushed forward, growth, start getting differentiation, relatively impermeable. Job is to grow and give sense of direction: elongation zone: start to get root hairs, major parts of absorption of water and salt, has casparian band. Job is to keep out unwanted stuff: maturation zone: relatively impermeable zone, job is just to transport (think about how roots we see of a tree are really thick and woody) You can confuse a plant, we see the root turn when the water potential gets smaller as you grow down the plant therefore senses no water which overrides the gravitational pull. Indicates that water plays a role i(cid:374) (cid:373)o(cid:448)e(cid:373)e(cid:374)t, (cid:449)e just do(cid:374)"t k(cid:374)o(cid:449) ho(cid:449) (cid:455)et.

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