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The use of soybean plantlets to study root nodule senescence

, : The use of soybean plantlets to study root nodule senescence. Journal of Plant Physiology 141(2): 206-209

Two types of soybean (Glycine max (L.) Merr) plantlets were prepared by rooting cuttings of trifoliates and stem pieces with apical buds. These were termed trifoliates and multifoliates, respectively. The trifoliates did not increase in size or undergo visible signs of development including flowering or senescence. The multifoliates increased in height by 4 to 5 time, flowered, set seed and senesced. Both plantlet types were nodulated by four strains of Bradyrhizobium japonicum. The timing of nodulation and the nodule phenotype were indistinguishable from those observed when seed-grown plants were nodulated by the same strains. As in seed-grown plants, nitrogen fixation in multifoliates declined just prior to flowering. Since the same decline was observed in non-flowering trifoliates, it is unlikely that flowering and seed set, alone, are responsible for the observed decline in nitrogen fixation.

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Accession: 002530619

DOI: 10.1016/S0176-1617(11)80761-3

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