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Inheritance of Rosette-Raceme in Guar

Cropping Systems Research Laboratory, Route 3, Box 215, Lubbock, TX 79401

^* Corresponding author.

Abnormal plants occur from time to time in cultivated fields of guar [Cyamopsis tetragonoloba (L.) Taub]. Abnormalities due to genetic change have potential for use as genetic markers in a breeding program. A mutant having a rosette-raceme and reduced fertility was found in a released breeding line, TX76-328S, growing near Hluwe in Natal, South Africa. Inheritance of the rosette-raceme trait was investigated. Rosette-raceme was found to be inherited as a monogenic recessive and is expressed on every raceme. The name rosette-raceme and the gene symbol, ros, are proposed for the new mutant trait. This trait should be useful in genetic studies as an easily identifiable phenotype.

Key Words: Cyamopsis tetragonoloba (L.) Taub. • Clusterbean • Heritability • Gene symbol • Sterility

Received for publication November 7, 1987.