Cultivar and Rhizobium strain effect on nitrogen fixation and transport inPhaseolus vulgaris L. |
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Authors: | Mariangela Hungria Maria C P Neves |
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Affiliation: | (1) EMBRAPA-Programa Nacional de Pesquísa em Biologia do Solo Km47, Seropédica, 23851 Rio de Jameiro, Brazil |
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Abstract: | The effects of Rhizobium strain and its interaction with plant cultivar were examined in glasshouse-grownPhaseolus 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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Keywords: | dry beans harvest index hydrogen evolution nitrogenase rhizobium ureides |
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