Observations on the Genetics of the Red Anther Trait

James McD. Stewart and Richard W. Miles


 
ABSTRACT

The red anther trait is characterized by the production of red pigment in the wall of the anther beginning when the floral bud is between 3 and 4 mm in length. The production of pigment in the anther wall is independent of pigmentation in the filament or petal spot. The gene for the trait originated from an interspecific hybrid between G. herbaceum and G. armourianum, with the latter being the contributing parent. The synthetic allotetraploid was backcrossed twice with white-anthered G. hirsutum and then self-pollinated. Red-anthered plants were selected for crossing with Stoneville 506 to obtain F1s and F2 populations. Degree of pigmentation in the F2 population was continuous, indicating multiple factors controlling level of expression. When scored on the basis of pigment no pigment, the segregation ratio fit 3:1 single dominant gene. Red-anther parents were crossed with TM-1 genetic standard, T-582 multiple recessive marker line, and T-586 multiple dominant line, and F2 and BC populations were developed. Analysis of these populations revealed that the red anther trait was not coinherited with R(1) in 715 plants. Segregation and recombination ratios with cl(1) and red anther indicated strong repulsion with apparent linkage of approximately 6 cM between the two loci. This compares to 17 reported for cl(1) and R(1). From this study we conclude that expression of the red anther trait is controlled by one gene but the intensity of expression is controlled by multiple alleles. Further, the locus is allelic to R(1).



Reprinted from 1993 Proceedings Beltwide Cotton Conferences pg. 613
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998