Add time:08/30/2019         Source:sciencedirect.com

SummaryAMO-1618 and ancymidol, inhibitors of gibberellin biosynthesis, retarded germination of Amaranthus caudatus L. seeds, ancymidol being more active than AMO-1618. Transfer of seeds to ancymidol after imbibition in water for 12 h caused inhibition of germination. Longer imbibition in water led to reduced sensitivity of seeds to subsequently applied ancymidol. The germinating capacity of seeds preincubated in ancymidol for 3–17 h was restored markedly following transfer to water. Gibberellic acid (GA3) greatly reduced or reversed the germination inhibitory effect of either AMO-1618 or ancymidol. It is suggested that endogenous GAs are required for induction and/or stimulation of early growth of the radicle.

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