Contribution of basal portion of shoot to nitrogen fixation associated with wetland rice oryza sativa

Watanabe, I.; Cabrera, D.; Barraquio, W.L.

Plant and Soil 59(3): 391-398


ISSN/ISBN: 0032-079X
Accession: 005045139

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O. sativa grown in flooded soil were transferred to water culture solution, and acetylene reduction activities (ARA) of intact plants and rootless plants were measured for 5 h. Relative rate of ARA associated with the rootless wetland rice plant as compared with an intact plant varied from 8-100%, depending on the growth stage and varieties of rice and was highest at the early stage (3 wk after transplanting) for all cultivars tested (IR26, Latisail, Khao Low and JBS 236). ARA of shoots was associated with basal parts of the shoots .apprx. 3 cm from the base of wetland cultivated rice and O. australiensis. Phyllospheric ARA was negligible except for senescent outer leaf sheaths. Microaerophilic N2-fixing bacteria also inhabited basal parts of shoots (outer leaf sheaths and stems) of wetland rice. Apparently, N2-fixation is partly associated with the shoots of wetland rice plants.