Abstract
Summary By measuring of natural 15N abundances, the nodules of sword bean, Adzuki bean, mungbean, cowpea, and soybean were found to be highly enriched in 15N whereas those of peanut were not. The bacteroid fractions of these six legumes were more enriched in 15N than the residue or plant cytosol fractions in nodules. The 80% ethanol soluble fraction of mungbean and soybean bacteroids was more enriched in 15N than the whole bacteroids. The 15N abundance of the neutral + acidic fraction of nodule cytosol was low, comparable to the value of the leaf. The Azolla-Anabaena symbiosis discriminated nitrogen isotopes slightly during N2 fixation. Anabaena had higher 15N abundance than the host Azolla plants. Comparison of soil-grown Azolla and Lemna gave estimation of contribution of N2-fixation to the N nutrition of Azolla as high as 59-99%. The mechanisms of 15N discrimination in nodule and Azolla symbiosis are discussed.
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