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A progress report on the breeding of caducous bract cotton.

Muramoto-H; Sherman-R; Ledbetter-C

Proceedings of the Fifth Cotton Dust Research Conference, beltwide cotton production research conferences, January 6-8, 1981, New Orleans, Louisiana. Wakelyn PJ, ed. Memphis, TN: The National Cotton Council of America, 1981 Jan; :23-23

00172347

Steps achieved thus far in the program to develop caducous bract cotton were reviewed. A type of cotton that drops its bracts before the bolls open was obtained, and development of a commercially viable crop was begun. Crossing Gossypium-hirsutum with G- armourianum and treating the hybrid with colchicine to double the chromosome number resulted in hexaploid cotton plants containing 78 chromosomes instead of the 52 chromosomes present in commercial cultivars. Three different methods of back cross breeding were undertaken in attempts to transfer the caducous bract from the hexaploid plants to tetraploid commercial cultivars. One method involved crossing the caducous bract hexaploid with tetraploid commercial cultivars. The second involved crossing caducous bract hexaploid cotton with another hexaploid derived from crossing G- hirsutum with G-sturtianum, with the resulting hybrid hexaploid back crossed to G-hirsutum. The third method involved crossing caducous bract hexaploid with a diploid, G-herbaceum, to arrive at an instant tetraploid. Attempts were also undertaken to develop a commercial variety of caducous bract hexaploid cotton. Fertility and yield had both shown improvement.

NIOSH-Grant; Cotton-industry; Dust-control; Cotton-dust; Cotton-fibers; Genetics; Agricultural-products; Plant-cells; Plant-substances;

19810108

Conference/Symposia Proceedings;

Wakelyn-PJ;

130527.00

Grant;

1981

Grant-Number-R01-OH-00860

Proceedings of the Fifth Cotton Dust Research Conference, beltwide cotton production research conferences, January 6-8, 1981, New Orleans, Louisiana.

AZ;

Plant Sciences University of Arizona Plant Science Department Tucson, Ariz 85721