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Registration of Eight Bacterial Blight Resistant Cotton Germplasm Lines
Author(s) -
Shepherd Raymond L.,
Kappelman A. J.
Publication year - 1987
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1987.0011183x002700010043x
Subject(s) - germplasm , crop , blight , library science , citation , bacterial blight , biology , horticulture , microbiology and biotechnology , agricultural science , agronomy , computer science , gene , biochemistry
by Xanthomonas malvacearum (E. F. Sm) Dows.]. The okraleaf trait reduces boll rot by opening up the plant canopy and confers resistance to white fly [Trialeurodes abutilonea (Haldeman)] (1), and to pink bollworm [Pectinophora gossypiella (Saunders)] (4). Okra-leaf plants also mature earlier (1). These germplasm lines should be useful in cotton improvement programs to reduce leaf and boll diseases, and to control insects. The four germplasm lines were designated Aub Br Ok4 (GP-288), Aub BR Ok5 (GP-289), Aub BR Ok6 (GP-290), and Aub BR Ok7 (GP-291). The lines originated from the cross (Auburn BR1 with B2B3 genes X Auburn 56 Okra Leaf) X (Auburn BR1 X 79N with B2B3B7 genes). The origin of okra leaf in Auburn 56 Okra Leaf is unknown. The origins of 79N (3) and Auburn BR1 (2) were reported previously. Selections were made for okra leaf and bacterial blight resistance in the F2 through F4 generations after plants were inoculated with a mixture of races 1, 2, 6, 7, 10, and 18 of the bacterium in the field. In F4, self-pollinated seed of 40 to 50 bacterial blight resistant-okra leaf plants of each line were bulked for increase and release. The germplasm lines, along with the check 'Auburn 56', were field tested in 1984. Lint yield of Aub BR Ok4 was not significantly different than that of Auburn 56, but the other three lines had lower yields. Each of the lines had lower lint percentages [(lint/ seed cotton) X 100], fiber elongation (E,), and micronaire than that of the check. Boll weights of the lines were similar to the check. All of the lines had longer and stronger fiber than the check. Small amounts of seed of these four lines are available for distribution to cotton breeders, geneticists, and other research workers. Written requests should be addressed to R. L. Shepherd, USDA-ARS, Crop Science Research Laboratory, P.O. Box 5367, Mississippi State, MS 39762-5367.