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- Title
Inheritance of resistance to fenoxaprop-p-ethyl in sprangletop ( Leptochloa chinensis L. Nees).
- Authors
Phongphitak, Ekkasit; Maneechote, Chanya; Rerkasem, Benjavan; Jamjod, Sansanee
- Abstract
Sprangletop ( Leptochloa chinensis L. Nees) is a serious grass weed in direct-seeded rice cropping systems in Thailand. One population of sprangletop, BLC1, was found to be resistant to fenoxaprop-p-ethyl at 62-fold the concentration of a susceptible biotype, SLC1. This study elucidated the inheritance of resistance to fenoxaprop-p-ethyl in this sprangletop BLC1 genotype. The reaction to the herbicide at 0.12-2.4 mg ai L−1 was determined in the seedlings of self-pollinated resistant BLC1, susceptible SLC1 and SLC1 that had been allowed to cross-pollinate with BLC1. At 0.24 mg ai L−1, all the seedlings of SLC1 were killed, while 99% of BLC1 survived, along with 5% of the cross-pollinated SLC1 seedlings, which were considered to be putative F1 hybrids. The root and shoot lengths of the F1 hybrids in 0.24 mg ai L−1 of fenoxaprop-p-ethyl, relative to those in the absence of the herbicide, were close to or the same as the resistant parent, indicating that the resistance is a nearly complete to complete dominant trait. One-hundred-and-forty-one of the F2-derived F3 families were classified by their response to the herbicide at 0.24 and 0.48 mg ai L−1 into 39 homozygous susceptible : 72 segregating : 30 homozygous resistant, fitted with a 1:2:1 ratio at χ2 = 1.21 and P = 0.56, indicating that the resistance to fenoxaprop-p-ethyl in the sprangletop BLC1 genotype is controlled by a single gene.
- Subjects
THAILAND; LEPTOCHLOA; CROPPING systems; HEREDITY; FENOXAPROP
- Publication
Weed Biology & Management, 2014, Vol 14, Issue 3, p159
- ISSN
1444-6162
- Publication type
Article
- DOI
10.1111/wbm.12043