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Plant Growth & Development: Seed Germination

Bio12 presentation
by

Luisa Paula Lioanag

on 21 February 2012

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Transcript of Plant Growth & Development: Seed Germination

SEED GERMINATION mung bean seeds cotton & other suitable materials transparent containers water corn seeds materials procedure 1
Surface-sterilized 12 corn grains and 12 mung beans in chlorox for 10 mins. Rinse with water. OR....
Simply soak corn grains and mung beans in water for 10 mins. 2
Position the grains and beans alongside glass jars using cotton and other suitable materials
Add a little amount of water. 3
Observe for 10-12 days. Place 5 of the 12-day-old seedlings on tissue and have their weight contaminates by day 2-3 day 3-4 day 5-6 day 6-7 day 8-10 day 1-3 day 4-5 day 5-6 day 7-8 day 8-9 day 9-10 day 10-12 Introduction The seed is a dispersal unit highly adapted, structurally and physiologically, to assure the continuation of a new generation of plants.

Dormancy may be regarded as the failure of an intact viable seed to complete germination, sometimes even when conditions are favorable. (Bewley and Black, 1994; Vleeshouwers et al., 1995; Lange, 1996)

Germination, on the other hand, refers to the events occuring after the absorption of water by the dormant, dry seed and ends with the elongation of the embryonic axis. (Bewley and Black, 1994)
Factors that affect SEED GERMINATION INTERNAL FACTORS seed vitality and maturation (age, seed coat condition, moisture content, etc
genetic potential for germination
seed dormancy EXTERNAL FACTORS light
temperature
oxygen availability
water
Which part of the embryo emerged first during seed germination for the corn grains? Is this also true for the bean seeds? Corn (monocot) radicle is protected by coleorhiza, which grows out of the seed first before the radicle emerges. For the mung bean (dicot) the radicle is the first to emerge. What is the term used for water intake by a germinating seed? Imbibition. This is the process by which water permeable seeds absorb or lose water until they come into equilibrium with their surroundings and happens when there is suitable temperature and adequate amount of water. What plant hormone is involved in the breakage of seed dormancy? Explain the mechanism of its activity Gibberellin. Seed dormancy is maintained by the balance of the plant hormones Gibberellin (GA) and Abscisic Acid (ABA). ABA is more abundant when the seed is dormant, but when water penetrates the seed, a shift occurs and the seed begins GA production. Once GA amount reaches a certain level, seed dormancy breaks and germination begins. Name some other factors that may prolong the dormancy of the seeds. Moisture content (with lower moisture content, the longer dormancy period), hormones (GA & ABA), light, temperature, nitrate Break from dormancy and germinate! Thank you! results ADDITIONAL OBSERVATIONS
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