BSCI 1511 Chapter Notes - Chapter 35: Stoma, Thigmotropism, Auxin
25 Apr 2016
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Morphogenesis: process that gives tissues shape and determines positions of cell types. Cell differentiation: process by which cells become different from one another. Short time to grow, produces lots of seeds, and has tiny genome. Reacts well with agrobacteria which serves as knock out mutant to see what a gene does. Etiolation, morphological adaptation for growing in darkness (potato in fridge, no leaves) De-etiolation, happens when exposed to light, leaves expand and stem grows (greening) Reception: phytochrome located in cytoplasm and receptive to de-etiolation. Transduction via secondary messengers: phytochrome activation causes ca2+ concentration to increase and activation of guanylyl cyclase which produces cgmp, both ca2+ and cgmp produce de- etiolation response. Gravity: gravitotropism roots display positive and shots display negative, roots always grow down regardless of orientation of seed: statoliths pool at the bottom and cause it to form downwards with calcium and auxin.
