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The Journal of Heredity 1992:83(5):330-334
© 1992 The American Genetic Association 83:330-334

research-article

Interrelationship of Brown and Purple Testa Genes with Pericarp and Other Testa Genes in Sorghum bicolor

A. M. Golmirzaie, and J. O. York

Department of Agronomy, University of Arkansas, and the Arkansas Agricultural Experiment Station Fayetteville, AR 72701

Abstract

A study was conducted to determine the pericarp and testa genotypes of the two purple testa sorghum [Sorghum bicolor (L.) Moench] lines, AR3009 and TAM2566, and to determine the effect of the testa color gene on the pericarp and other testa genes. Five sorghum lines were used as testers: AK3001R (white-pearly pericarp with no testa), AK3002 (red-starchy pericarp with no testa), AK3003 (pink-brown and starchy pericarp with a brown testa), TX385 (white-starchy pericarp with no testa), and TX399 (pink-starchy pericarp with no testa). The two sorghum lines AR3009 and TAM2566 were mated to each other and to all the tester lines, and their segregation ratios were studied. The F2 and F3 generations were classified for the characters under study. Observed segregations were tested by the chi-square method for goodness of fit against theoretical ratios. The testa color inheritance was controlled by a single gene: Tp- produced a brown testa color, and tptp produced a purple testa color. The results obtained from these tests did not indicate linkage of testa color genes with the genes controlling pericarp colors or with the presence of the testa (B1 and B2), spreader (S), or mesocarp (Z) genes. They also indicate that testa color genes Tp and tp do not affect the inheritance of pericarp and other testa genes.


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