Auxin biosynthesis during seed germination in Phaseolus vulgaris

Krystyna Bialek, Lech Michalczuk, Jerry D. Cohen

Research output: Contribution to journalArticlepeer-review

66 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)509-517
Number of pages9
JournalPlant physiology
Issue number1
StatePublished - 1992


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