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Effect of Root Genotype on Shoot Water Relations in Soybeans¹

The maintenance of adequate water relations in the above ground portions of plants is partially determined by the effectiveness of water absorption by the root system. The object of this study was to determine if reportedly different soybean [Glycine max (L.) Merr.] root types differ in ability to maintain leaf water potential, stomatal opening, the photosynthesis in a genetically common top. ‘Chippewa 64’ tops were grafted to rootstocks of four different genotypes (‘Aoda,’ PI 79648, ‘Chippewa 64,’ and ‘Harosoy 63‘) when in the seedling stage. Grafted plants were subjected to water stress at three stages of development. Symptoms of water stress were more severe in Chippewa 64 scions grafted on Aoda and PI 79648 rootstocks than in those grafted on Harosoy 63 and Chippewa 64 root stocks. These effects become increasingly evident during flowering and pod filling. When stressed during pod filling, Chippewa 64 tops grafted on Aoda and PI 79648 rootstocks snowed significantly higher stomatal resistances and lower leaf water potentials andphotosynthetic rates than did Chippewa 64 tops grafted on Harosoy 63 and Chippewa 64 rootstocks.

Key Words: Glycine max (L.) Merr. • Water absorption • Grafting • Photosynthesis • Leaf water potential • Stomatal resistance • Yield components

² Assistant professor, Dep. of Biol., West Chester State College, West Chester, PA 19380, and associate professor, Dep. of Agron. and Plant Genet., U. Minn., St. Paul, MN 55108, respectively.

Received for publication October 7, 1974.

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