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Cultivar and Rhizobium strain effect on nitrogen fixation and transport in Phaseolus vulgaris L.

MARIANGELA HUNGRIA and MARIA C. P. NEVES
Plant and Soil
Vol. 103, No. 1 (1987), pp. 111-121
Published by: Springer
Stable URL: http://www.jstor.org/stable/42936806
Page Count: 11
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Cultivar and Rhizobium strain effect on nitrogen fixation and transport in Phaseolus vulgaris L.
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Abstract

The effects of Rhizobium strain and its interaction with plant cultivar were examined in glasshouse-grown Phaseolus vulgaris in two experiments where the physiological attributes defining the symbiotic efficiency were determined. Strains of Rhizobium significantly affected nodulation, rates of N accumulation, partitioning of N within the mature shoot and remobilizaton of the N stored in the vegetative organs to the seeds. The most efficient symbiosis (strain CO5 with Negro Argel), in comparison with the least efficient symbiosis (strain 127 K-17 with Venezuela-350) showed higher rates of C₂H₂ reduction from flowering to mid pod fill stage, evolved less hydrogen from nodules and showed higher rates of N transport as well as higher percentages of ureide-N in the xylem sap. At maturity, the best cultivar/strain association exceeded the total N accumulated in the seed and the harvest index of the poorest symbiosis in 88% and 20%, respectively. The other symbiotic combinations were intermediate in all characteristics. Nitrogen accumulation in plant shoot showed highly significant correlation with acetylene reduction rates, nodule relative efficiency, total N transport in the xylem sap and percentage of N transported as ureides.

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