Inheritance and stacking effect of mutant ALS genes in Schoenoplectiella juncoides (Roxb.) Lye (Cyperaceae).

Autor: Ohta K; Health and Crop Sciences Laboratory, Sumitomo Chemical Co., Ltd., Hyogo, Japan; Graduate School of Agriculture, Kyoto University, Kyoto, Japan. Electronic address: ohtak4@sc.sumitomo-chem.co.jp., Sada Y; Health and Crop Sciences Laboratory, Sumitomo Chemical Co., Ltd., Hyogo, Japan.
Jazyk: angličtina
Zdroj: Pesticide biochemistry and physiology [Pestic Biochem Physiol] 2024 Jan; Vol. 198, pp. 105745. Date of Electronic Publication: 2023 Dec 13.
DOI: 10.1016/j.pestbp.2023.105745
Abstrakt: Schoenoplectiella juncoides, a noxious sedge weed in Japanese rice paddy, has two ALS genes, and ALS-inhibitor-resistant plants have a mutation in one of the ALS genes. The authors aimed (a) to quantitate the effect of the number of mutant alleles of ALS genes on whole-plant resistance of S. juncoides and (b) to clarify a mode of inheritance of the resistance by investigating resistance levels of the progenies of a hybrid between two S. juncoides plants with Trp 574 Leu substitution in different ALS. A dose-response analysis on the parental lines and the F 1 population suggested that the two ALS genes contribute equally to whole-plant resistant levels. A dose-response study on the F 2 population indicated that it could be classified into five groups based on the sensitivities to metsulfuron-methyl. The five groups (in ascending order of resistance levels) were considered to have zero, one, two, three, and four mutant alleles. The stacking effect of mutant alleles on resistance enhancement was more significant when the number of mutant alleles was low than when it was high; in other words, each additional mutant allele stacking increases plant resistance, but the effect saturates as the number of mutant alleles increases. A chi-square test supported that the segregation ratio of the five groups corresponds to 1:4:6:4:1 of Mendelian independence for the two ALS loci.
(Copyright © 2023 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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