Journalartikel

Jahr der Veröffentlichung: 1997

Seiten: 31-36

Zeitschrift: Journal of Plant Physiology

Bandnummer: 150

Heftnummer: 1-2

ISSN: 0176-1617

DOI Link: https://doi.org/10.1016/S0176-1617(97)80177-0

Verlag: Elsevier

Abstract: 
In this study possible reasons for unreliable N-2 fixation during the pod filling of common bean were examined. The experiment was conducted in water culture without mineral N under natural light conditions in the greenhouse. A supernodulating mutant of common bean Phaseolus vulgaris L. R32BS15 and its wild type cv. OAC Rico were used. Plants were inoculated with Rhizobium leguminosarum by. phaseoli during germination. The plants were cultivated until maturity. Four harvests were taken at several stages of plant development. N concentrations, N contents, amounts of total amino acids, ureides and sucrose were determined in roots, shoots, and nodules.Although the number of nodules of the mutant was higher there were no differences in Nz fixation during the experiment: between the wild type and the mutant. While the supply of the host planes with N was sufficient in the vegetative growth phase the performance of bacteroids to fix N-2 decreased markedly in the generative growth phase. A lack of carbohydrates in nodules as a result of sink competition among nodules and fruits was nor responsible for this decline since sucrose in the nodules was not limited. However, amino acids that accumulated in the nodules at the end of the experimental phase and a disturbance of ureide synthesis are discussed as possible inhibit ors of nitrogenase activity.

Harvard-Zitierstil: Becher, M., Schepl, U. and Schubert, S. (1997) N-2 fixation during different physiological stages of Phaseolus vulgaris OAC Rico and its supernodulating mutant R32BS15: The role of assimilate supply to and export from nodules, Journal of Plant Physiology, 150(1-2), pp. 31-36. https://doi.org/10.1016/S0176-1617(97)80177-0

APA-Zitierstil: Becher, M., Schepl, U., & Schubert, S. (1997). N-2 fixation during different physiological stages of Phaseolus vulgaris OAC Rico and its supernodulating mutant R32BS15: The role of assimilate supply to and export from nodules. Journal of Plant Physiology. 150(1-2), 31-36. https://doi.org/10.1016/S0176-1617(97)80177-0