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. 1992 Sep;100(1):509–517. doi: 10.1104/pp.100.1.509

Auxin Biosynthesis during Seed Germination in Phaseolus vulgaris1

Krystyna Bialek 1,2, Lech Michalczuk 1,2,2, Jerry D Cohen 1,2
PMCID: PMC1075579  PMID: 16652991

Abstract

The relative roles of de novo biosynthesis of indoleacetic acid (IAA) and IAA conjugates stored in mature seeds (Phaseolus vulgaris L.) in supplying auxin to germinating bean seedlings were studied. Using 2H oxide and 2,4,5,6,7-[2H]l-tryptophan as tracers of IAA synthesis, we have shown that de novo biosynthesis of IAA, primarily from tryptophan, is an important source of auxin for young bean seedlings. New synthesis of IAA was detected as early as the second day of germination, at which time the seedlings began to accumulate fresh weight intensively and the total content of free IAA began to increase steadily. IAA conjugates that accumulate in large amounts in cotyledons of mature seeds may thus be considered to be only one of the possible sources of IAA required for the growth of bean seedlings.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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