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The effect of inhibitors on the germination and growth of cress seeds Introduction Germination process Before seeds can mature into plants, they need to germinate. When the seed's internal and external conditions are favourable (specific for different seed species), their natural dormancy period brakes and germination begins. The limiting factors for germination are: Temperature (within a specific range limit) Light (Some seeds e.g. lettuce require differing wavelengths of light to germinate; others require specific intensities) Oxygen Water (An adequate supply) When given the right conditions, imbibition occurs as seeds take in water through the testa via osmosis and they enlarge in size. Water dissolves the hormone gibbellerinic acid in the cotyledon which diffuses across the aleurone layer and activates the gene coding for amylase. Amylase is then synthesised by the aleurone layer and diffuses into the endosperm and hydrolyses the starch store present which produces maltose. This is then hydrolysed to glucose which diffuses into the embryo and...

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