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Polyamine anabolism in germinating Glycine max (L.) seeds: dynamics of cadaverine and putrescine formation in the embryonic axis
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Active polyamine biosynthesis occurs in the embryonic axis, but not in the cotyledons, during germination of soybean [Glycine max (L.) cv. Williams] seeds and subsequent growth of the young seedlings. The hypocotyl and radicle synthesize and accumulate considerable amounts of cadaverine (Cad) and putrescine (Put) during the early stages of growth. Most of the amino acid precursors for the diamines are supplied from breakdown of the cotyledonary protein. About 40-50% of the lysine resulting from breakdown of the cotyledonary protein ends up in Cad in the hypocotyl and radicle. Cad represents about 3.5% of the axis nitrogen derived from the cotyledons, which is equivalent to about 50% of the lysine content (~7%) of the seed protein. The synthesis and accumulation of Put, the changes in the content of spermidine (Spd) and spermine (Spm) are discussed. The hypocotyl and radicle contain millimolar concentrations of Cad and Put which are primarily associated with the elongated zones. In contrast, Spd level or the molar ratio of Spd:Put appears to decrease as cell differentiation or elongation progresses. [AS/SS]
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 Record created 1985-05-31, last modified 2019-03-04

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