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Some physiological effects of podolactone‐type inhibitors
Author(s) -
Sasse Jenneth M.,
Wardrop Jennifer J.,
Rowan Kingsley S.,
Aspinall Donald,
Coombe Bryan G.,
Paleg Leslie G.,
Buta J. George
Publication year - 1982
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1982.tb00284.x
Subject(s) - coleoptile , abscisic acid , bioassay , gibberellic acid , zeatin , endosperm , biology , auxin , gibberellin , germination , botany , biochemistry , cytokinin , genetics , gene
Podolactone‐type inhibitors, including harringtonolide and lycoricidinol, affect several bioassays at 1 to 10 μ M. Although these compounds were less active than abscisic acid in inhibiting growth of coleoptiles of wheat embryos, podolactone A significantly decreased the number of mature spikelets of Lolium temulentum at a lower concentration than abscisic acid. Lycoricidinol was more active than podolactone E, the most active of the podolactones, in three bioassays. Inhibition of growth induced by gibberellic acid or zeatin with podolactone‐type compounds was not competitive. Harringtonolide was a strong inhibitor of growth at higher concentrations but did not affect auxin transport, while podolactone E and lycoricidinol inhibited it. Lycoricidinol, podolactone E and harringtonolide did not retard senescence of leaf‐discs. The promotive effects of gibberellic acid in the barley endosperm bioassay were counteracted by podolactone A.