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Imazamox Tolerance in Mutation‐Derived Lines of Upland Cotton
Author(s) -
Bechere Efrem,
Auld Dick L.,
Dotray Peter A.,
Gilbert Lyndell V.,
Kebede Hirut
Publication year - 2009
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/cropsci2008.09.0528
Subject(s) - biology , ethyl methanesulfonate , gossypium hirsutum , mutant , locus (genetics) , cultivar , gossypium , mutagenesis , gene , fiber crop , allele , agronomy , botany , horticulture , genetics
Induction of genes conferring herbicide resistance by mutagenesis could facilitate use of imidazolinone herbicides in upland cotton ( Gossypium hirsutum L.). In 1997 and 1998, seeds of eight High Plains cotton cultivars were treated with 2.45% v/v ethyl methanesulfonate. The resulting M 3 and M 4 generations were sprayed with imazethapyr, and the M 5 and M 6 generations were sprayed with imazamox. Four stable M 6 to M 7 lines with tolerance to imazamox were identified in 2004. During 2005 and 2006, tolerant mutants and their nonmutated parents were treated at the four‐leaf stage with topical applications of imazamox applied at five rates (0, 88, 175, 350, and 700 g a.i. ha −1 ). Elevated levels of tolerance to imazamox were observed in all mutants. Imazamox did not impact fiber length. Preliminary investigation indicated that tolerance to imazamox was controlled by a partially dominant single gene. An allelism test revealed that the tolerance genes in the four mutants are either alleles in the same locus or are very tightly linked.