Phytohormones, Rhizobium mutants, and nodulation in legumes. III: Auxin metabolism in effective and ineffective pea root nodules
TLDR
The data suggest that metabolism of auxins may be important for the persistence of a functional root nodule and the identity of these compounds was obtained by chromatography in other systems.Abstract:
[(3)H]Zeatin riboside was supplied to intact pea (Pisum sativum) plants either onto the leaves or onto the root nodules. When applied directly to nodules, approximately 70% of recovered radioactivity remained in the nodules, approximately 15% was detected in the root system, and 15% was in the shoot. However, when supplied to the leaves, little (3)H was transported, with approximately 0.05% of recovered radioactivity being found in the root system and nodules. On a fresh weight basis, nodules accumulated more (3)H than the parent root. In both types of studies, metabolites with an intact zeatin moiety were detected in root nodules.In all experiments, two-dimensional thin layer chromatography revealed that little (3)H remained as zeatin riboside in root or nodule tissue at the end of the labeling period. Nodules metabolized [(3)H]zeatin riboside to the following cytokinins/cytokinin metabolites: zeatin, adenosine, adenine, the O-glucosides of zeatin and zeatin riboside, lupinic acid, nucleotides of adenine and zeatin, and the dihydro derivatives of many of these compounds.Although a few small differences were observed, there were no major differences between root and nodule tissue in their metabolism of [(3)H] zeatin riboside. Furthermore, any differences between effective and ineffective nodules were generally minor.read more
Citations
More filters
Journal ArticleDOI
Plant Growth-Promoting Bacteria: Mechanisms and Applications
TL;DR: It is envisioned that in the not too distant future, plant growth-promoting bacteria (PGPB) will begin to replace the use of chemicals in agriculture, horticulture, silviculture, and environmental cleanup strategies.
Journal ArticleDOI
Indole-3-acetic acid in microbial and microorganism-plant signaling.
TL;DR: The fact that bacteria use this phytohormone to interact with plants as part of their colonization strategy, including phyto-stimulation and circumvention of basal plant defense mechanisms, is highlighted.
Journal ArticleDOI
Auxin and Plant-Microbe Interactions
Stijn Spaepen,Jozef Vanderleyden +1 more
TL;DR: There is increasing evidence that indole-3-acetic acid (IAA), the major naturally occurring auxin, is a signaling molecule in microorganisms because IAA affects gene expression in some microorganisms, therefore, IAA can act as a reciprocal signaling molecules in microbe-plant interactions.
Book ChapterDOI
Plant growth-regulating substances in the rhizosphere: microbial production and functions
TL;DR: This chapter provides a better understanding of the mechanisms of actions of microbially derived PGRs and their interactions with plants and can aid in the utilization of microbial P GRs for the betterment and benefit of sustainable agriculture.
Journal ArticleDOI
Auxin biosynthesis and storage forms
TL;DR: The many ways auxin levels are regulated through biosynthesis, storage forms, and inactivation are discussed, and the potential roles modified auxins play in regulating the bioactive pool of auxin to affect plant growth and development are discussed.
References
More filters
Journal Article
Chemical regulation of growth and organ formation in plant tissues cultured in vitro.
F Skoog,C O Miller +1 more
Journal ArticleDOI
The Polar Transport of Auxin
TL;DR: In this paper, anion permeability-simple diffusion usion or carrier-mediated diff usion was used to detect the path of auxin transport in a micro-autoradiography.
Journal ArticleDOI
Chemistry and Physiology of the Bound Auxins
and J D Cohen,R S Bandurski +1 more
TL;DR: In this paper, the discovery of bound auxins was discussed and the natural conjugates of bounded auxins were investigated. But the main focus of the paper was on the production of conjugate formation.
Journal ArticleDOI
Concentration of Indole-3-acetic Acid and Its Derivatives in Plants.
Robert S. Bandurski,Aga Schulze +1 more
TL;DR: All plant tissues examined contained most of their IAA as derivatives, either esterified or as a peptide; the cereal grains examined contained mainly ester IAA; and the legume seeds examined contain mainly peptidyl IAA.