BIOL10004 Lecture Notes - Lecture 10: Gravitropism, Vernalization, Ethylene
30 Jul 2018
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Document Summary
Light acts as a stimulus- the bending/turning of a stem towards the light. May be primarily synthesised from amino acid tryptophan. Auxins are affect in many aspects of plant development by regulating gene expression. Gravitropic bending of a root or shoot results from differential growth on upper and lower sides of the root or shoot. Detection of gravity may involve the sedimentation of plastids (statoliths), often amyloplasts, which contain starch granules. Arf"s- transcription factors that bind to auxin regulatory elements in promoters of auxin inducible genes. Maintenance of apical dominance by inhibiting growth of lateral buds. Used to make seedless fruit from unfertilised ovaries. Occur in low concentrations in vegetable tissues. Seed food reserves must be mobilised & transported to embryo. Ga- stimulates range of enzymes break down endosperm starches & proteins into sugars & amino acids. Regulate senescence (yellowing of leaves on intact plant) Regulation of growth of axillary buds bud growth is promoted by direct.
