IFEVA 02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
artículos
Título:
Genetic control of cytochrome P450-based herbicide metabolism in Lolium rigidum.
Autor/es:
BUSI, R.; VILA AIUB, MM; POWLES, SB
Revista:
HEREDITY
Editorial:
NATURE PUBLISHING GROUP
Referencias:
Año: 2011 p. 817 - 824
ISSN:
0018-067X
Resumen:
The dynamics of herbicide resistance evolution in plants areinfluenced by many factors, especially the biochemicaland genetic basis of resistance. Herbicide resistance canbe endowed by enhanced rates of herbicide metabolismbecause of the activity of cytochrome P450 enzymes,although in weedy plants the genetic control of cytochromeP450-endowed herbicide resistance is poorly understood. Inthis study we have examined the genetic control of P450metabolism-based herbicide resistance in a well-characterizedLolium rigidum biotype. The phenotypic resistancesegregation in herbicide resistant and susceptible parents,F1, F2 and backcross (BC) families was analyzed as plantsurvival following treatment with the chemically unrelatedherbicides diclofop-methyl or chlorsulfuron. Dominance andnuclear gene inheritance was observed in F1 families whentreated at the recommended field doses of both herbicides.The segregation values of P450 herbicide resistancephenotypic traits observed in F2 and BC families wasconsistent with resistance endowed by two additive genesin most cases. In obligate out-crossing species such asL. rigidum, herbicide selection can easily result in accumulationof resistance genes within individuals.
