What are gibberellins?
Gibberellins are plant growth regulators that stimulate seed germination and regulate plant height via stem growth.
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How do gibberellins promote cell extension in stems?
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How do gibberellins regulate genes involved in the synthesis of amylase?
Gibberellins cause an increase in the transcription of mRNA coding for amylase.
They do this by promoting the destruction of DELLA proteins that would otherwise inhibit factors that promote transcription.
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What is the endosperm?
The endosperm is an energy store within the seed, containing the polysaccharide starch. It is located around the embryo.
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What is the aleurone layer?
The aleurone layer is a protein-rich layer on the outer edge of the endosperm in a seed.
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Outline the stages of germination and the role of plant hormones in this process.
There is evidence that the level of the plant hormone abscisic acid (ABA) also helps to determine when germination occurs.
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