Abstract
The mature nodules ofPhaseolus aureus Roxb. var.mungo possessed, in comparison with young and old nodules, higher activities of nitrogenase (N2ase), and indol-3-ylacetic acid (IAA) metabolic enzymes like IAA oxidase, methylene oxindole reductase and peroxidase; higher levels of IAA-like, gibberellic acid-like (GA), and cytokinin-like (CK) substances and tryptophan, and lower level of phenol. The abscisic acid-like (ABA) substance level was higher in the old nodules.
The N2ase activity in the mature nodules changed parallelly with IAA and OK. butoppositely with GA and ABA. The changes in tryptophan level, IAA oxidizing enzymes, and phenol metabolism controlled the IAA level in the nodules.
The nodules developed similarly throughout the year, but they had variable hormone levels in different seasons. This indicated that the formation and growth of the nodules was controlled not only by the nodular hormones.
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Abbreviations
- N2ase:
-
nitrogenase
- IAA:
-
indol-3-ylacetic acid
- Meox:
-
methylene oxrndole
- GA:
-
gibberellie acid
- CK:
-
cytokinin
- ABA:
-
abscisic acid
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Dangar, T.K., Basu, P.S. Studies on plant growth substances, IAA metabolism and nitrogenase activity in root nodules of phaseolus aureus Roxb. var.mungo . Biol Plant 29, 350–354 (1987). https://doi.org/10.1007/BF02886613
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DOI: https://doi.org/10.1007/BF02886613