BISC 101 Lecture Notes - Lecture 24: Cytokinin, Abscission, Arginine

• School: Simon Fraser University
• Department: Biological Sciences
• Course: BISC 101
• Professor: Onkar Bains

Document Summary

Topic 17 (plant responses to internal and external signals) For example, a potato left growing in darkness produces shoots that look unhealthy and lacks elo(cid:374)gated roots these are (cid:373)orphologi(cid:272)al adaptatio(cid:374)s for gro(cid:449)i(cid:374)g i(cid:374) dark(cid:374)ess, (cid:272)olle(cid:272)ti(cid:448)el(cid:455) called etiolation. A potato"s respo(cid:374)se to light is reception, transduction, and response. Si(cid:374)(cid:272)e (cid:272)(cid:455)toki(cid:374)es the actions of cytokines tend to be more specific than the actions of hormones. Si(cid:374)(cid:272)e so(cid:373)e hor(cid:373)o(cid:374)es (cid:272)a(cid:374) (cid:272)ross (cid:272)ell (cid:373)e(cid:373)(cid:271)ra(cid:374)es the actions of hormones tend to be more general and wide spread than the actions of cytokines. The role of auxin in cell elongation: a(cid:272)(cid:272)ordi(cid:374)g to acid growth hypothesis , the proton (h+) pu(cid:373)ps lo(cid:449)er the ph i(cid:374) the (cid:272)ell (cid:449)all expansins, which are enzymes that break hydrogen bonds between cellulose fibers thus loosening the cell wall. Control of cell division and differentiation: cytokinins work together with auxin . A(cid:271)s(cid:272)isi(cid:272) a(cid:272)id slows growth (so antagonistic to plant growth hormones like auxin) Seed dormancy: aba inhibits plant growth (including.