Sept 25-08 - Plant Growth, Reproduction, & Environment Lecture

Sept 25-08 - Plant Growth, Reproduction, & Environment Lecture

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Josh Bovard Biology 111 – Thursday, September 25 th , 2008 Professor P LANT B ODY : S TRUCTURE AND N UTRITION Growth : Seed Germination is the process by which seeds begin growth into plants Generally dormant just after being shed Won’t germinate even if temperature, soil and moisture conditions are optimal Dormancy is most frequently due to the presence of the hormone abscisic acid (ABA) ABA has to degrade before the seed will germinate Frequently need a light signal to make them germinate Because most seeds have only a small amount of stored food, they have to germinate close to the soil surface If they ‘see’ the light they are close to the surface If they germinate deep down below the soil, they run out of food before then can perform photosynthesis above the surface Different types of light affect germination Red or white light encourages germination P r is the phytochrome that absorbs red light and gets converted to P fr The stimulation of P
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Sept 25-08 - Plant Growth, Reproduction, & Environment Lecture

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