BIOLOGY 1B Lecture Notes - Lecture 14: Germination, Positive Feedback, Ethylene
26 Jan 2018
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Earl(cid:482) (cid:476)ood : (cid:476)ider openin(cid:322)s in tra(cid:283)heids. Girdlin(cid:322) : remo(cid:475)al o(cid:321) a (cid:283)omplete rin(cid:322) o(cid:321) (cid:282)ark, stops phloem transport and kills roots. Lateral root: emer(cid:322)es (cid:321)rom peri(cid:283)(cid:482)(cid:283)le and throu(cid:322)h (cid:283)orte(cid:481) o(cid:321) ori(cid:322)inal root. S(cid:482)mplasti(cid:283) : throu(cid:322)h li(cid:475)in(cid:322) (cid:283)(cid:482)toplasm and plasmodesmata, must (cid:322)o throu(cid:322)h (cid:283)ell mem(cid:282)ranes. Apoplasti(cid:283) : throu(cid:322)h dead (cid:283)ell (cid:476)alls or (cid:282)et(cid:476)een them, no dis(cid:283)rimination (cid:282)(cid:482) plant. Casparian strip : impermea(cid:282)le su(cid:282)erin in trans(cid:475)erse and lateral (cid:283)ell (cid:476)alls, makes. Me(cid:283)hanisms o(cid:321) mo(cid:475)ement: solutes (cid:283)ross the (cid:283)ell mem(cid:282)rane. Passi(cid:475)e and a(cid:283)ti(cid:475)e transport (cid:1827)(cid:476)ith and a(cid:322)ainst (cid:322)radient(cid:1828) Water potential: potential ener(cid:322)(cid:482) o(cid:321) (cid:476)ater, its (cid:321)reedom to mo(cid:475)e. Plasmol(cid:482)sis : (cid:283)ellular wp > en(cid:475) wp. Tur(cid:322)idit(cid:482) : (cid:283)ellular wp < en(cid:475) wp. Bulk (cid:500)lo(cid:476) : due to di(cid:498)(cid:321)eren(cid:283)e in pressure. Pull (cid:321)rom lea(cid:475)es: throu(cid:322)h stomata, ne(cid:322)ati(cid:475)e pressure (cid:322)enerated (cid:282)(cid:482) transpiration-(cid:283)ohesion-tension me(cid:283)h. Stomata are tur(cid:322)id (cid:476)hen open, mi(cid:283)rotu(cid:282)ules in arra(cid:482) Ca(cid:475)itation : ne(cid:322)ati(cid:475)e pressure in (cid:481)(cid:482)lem is too (cid:322)reat, air (cid:282)u(cid:282)(cid:282)le (cid:321)orms and (cid:282)reaks (cid:283)ohesi(cid:475)e (cid:283)ontinuit(cid:482)
