Which of the following statement for Gibberellins is NOT CORRECT ?
Gibberellins can regulate cell cycle
Gibberellins (GAs) are tetracyclic diterpenoid plant hormones. They are made from geranylgeranyl diphosphate via ent-kaurene, i.e. through the terpenoid (isoprenoid) pathway, so the statement on their synthesis is correct.
GAs control phase change: applied GA alters the transition between juvenile and adult phases (for example in ivy and in conifers), so that statement is correct.
GAs promote seed germination: GA released by the embryo breaks dormancy and induces α-amylase and other hydrolases in the aleurone layer of cereal grains, mobilising the stored food. This statement is also correct.
Regulation of the cell cycle (activation of cyclin-dependent kinases and cyclins at the G1/S and G2/M checkpoints) is the classical role of cytokinins acting together with auxin. Gibberellins promote growth mainly by cell elongation – loosening the cell wall and enlarging cells – and are not counted among the cell-cycle regulating hormones; any effect they have on division is indirect.
So, among the given statements, the one that does not describe a recognised function of gibberellins is that they can regulate the cell cycle.
Hence, Gibberellins can regulate cell cycle.
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