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Unexpected Segregation Involving a Texas Marker Stock

Claude Rhyne


 
ABSTRACT

A gene for tolerance to herbicide was assigned to chromosome 1 using a Texas marker stock having the morphological markers L 1 L , lp1 and Lcx. This dominant marker was independent of the leaf shape marker on the short arm and 33.5 ± 9.2 cM from cotyledonary marker Lp 1 that is on the long arm. The lc x for white lint was associated with Lp1 of the tolerant parent such that lc x lcx was common to plants unharmed by herbicide. The Lc x for brown lint was independent of dominant leaf shape, but circa 30 ± 10 cM from the gene for tolerance. The undisturbed Lp 1 - L1 L segregation for normal chromosome 1 reported in Endrizzi and Stein (1975) became a disturbed one in the present study. This disturbance could be attributed to foreign DNA. Since Lc x has not been assigned in a formal manner to chromosome 1 and the three other brown linked markers have been placed on separate chromosomes, the Lc 4 is deduced for presence on chromosome
1. The lp 2 of chromosome 15 is part of a linkage group with multiple alleles for the green lint. The symbol for the dominant tolerance is pending instructions.





Reprinted from Proceedings of the 2001 Beltwide Cotton Conferences pp. 426 - 429
©National Cotton Council, Memphis TN

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Document last modified XXXXXX, XXX XX 2001