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Exogenous polyamines stimulate ethylene synthesis by soybean leaf tissues



Exogenous polyamines stimulate ethylene synthesis by soybean leaf tissues



Annals of Botany (London) 65(1): 45-50



Exogenous supply of spermine (Spm) markedly stimulated ethylene evolution from intact soybean [Glycine max] leaves of leaf discs, strongly increased the level of free 1-aminocyclopropane-1-carboxylic acid (ACC), and slightly stimulated ethylene forming-enzyme (EFE) activity. Spm treatment also resulted in leaf epinasty and accelerated leaf senescence. Ethylene stimulation was depressed, but not abolished, by light, and was suppressed by inhibitors of ACC synthase and EFE activity. Spermidine had a less pronounced stimulatory effect on ethylene production whereas the diamines putrescine and diaminopropane were without effect. These results contrast with other reports indicating that di- and polyamines inhibit ethylene biosynthesis in plants, and extend our previous results on detached tobacco leaves exogenously treated with polyamines.

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Accession: 001831251

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