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Regulation of senescence by benzylaminopurine and uniconazole in intact and excised soybean cotyledons

, : Regulation of senescence by benzylaminopurine and uniconazole in intact and excised soybean cotyledons. Plant Physiology & Biochemistry (Paris) 31(6): 827-834

The influence of benzylaminopurine (BA) and uniconazole (UCZ) on the senescence of 14-day-old soybean (Glycine max) was examined by treating cotyledons on intact plants or excised cotyledon discs. Senescence of the cotyledons, measured as the loss of chlorophylls (Chl) a and b, carotenoids, protein and increased membrane leakiness, was more rapid in the excised system. In both systems there were high positive correlations among the conversion of exogenous ACC (1-aminocyclopropane-1-carboxylic acid) to ethylene, lipoxygenase (EC (LOX) activity and Chl a levels which declined as the cotyledons senesced. However, these correlations were not evident in the BA-treated cotyledons which had relatively high Chl levels. Therefore the results of this study do not support the contention that LOX activity, ACC conversion and senescence are interrelated. In both systems BA was more effective in delaying senescence compared to the control and UCZ-treated cotyledons. In the excised system UCZ tended to hasten while in the intact system UCZ delayed senescence. This study demonstrates that UCZ acts as an anti-senescence agent when applied to intact plants and the implications of this in postharvest physiology warrants further investigation.

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