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Lecture 17 - Seed germination and dormancy

Lecture 17 - Seed germination and dormancy - SEED...

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SEED GERMINATION AND DORMANCY Lecture 17
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Seed germination
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RECYCLE!
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Seed germination: Activation of the ______________________ of  the  embryo leading to the development of a new seedling plant Initiation requires 3 conditions be fulfilled: 1) Seed must be _______________ 1) Seed must be subjected to appropriate environmental  conditions  (H 2 0, temp., gases, light) 1) Any primary _______________ in the seed must be  overcome
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Seed germination: Steps: 1.     2.     3.      
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Step 1. ___________ –  active ________ uptake - Water activates the biochemical process   leading  to germination (secretory cells ) Seed Germination- (monocots) Dry Seeds Imbibed Seeds
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Seed Germination- (monocots) ________ –  period of active metabolic  activity Initial growth of the embryo dependent on  stored reserves 1) ____________          2) __________________(starches) 3) _____________ (oils) ___________ required to catabolize stored  reserves to make reserves available
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Step 2. _________- ____________  transport  Water carries GA 3  from the embryo  to the aleurone  layer Seed Germination- (monocots) During stratification- [GA] rise to promote germination [Hormone] Stratification Period AB A CYT GA Fig. 7-36
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Step 2. ___________-  _______________________ GA 3  activates genes in aleurone (mRNA) - Protein______  digest storage proteins into amino acids - Alpha amyl______  break down starch into simple sugars - Lip______  break down lipids Seed Germination- (monocots) proteases (lipase)
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Step 2. __________–  _________________________ - ___________ transferred to embryo and induces       expansion of the seedling structures Seed Germination- (monocots)
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