Grafting experiments have been used to gain further understanding of the control of root and shoot systems in soybean plants. For example, Carver et al. (1987) demonstrated that root stock significantly influenced seed fatty acid composition of grafted scions. Caldwell and Hanson (1968) reported that seed protein and oil accumulation were governed by the above ground portion of the plant. Cho and Harper (1991) used reciprocal grafting experiments to study the response of nodulation mutants in soybean. They found that the nonnodulating mutant NN5 was strictly root controlled, whereas the hypernodulating mutant NOD 1-3 was shoot controlled.
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