Different mutations endowing resistance to Acetyl-CoA carboxylase inhibitors results in changes in ecological fitness of lolium rigidum populations

Maor Matzrafi, Ofri Gerson, Baruch Rubin, Zvi Peleg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Various mutations altering the herbicide target site (TS), can lead to structural modifications that decrease binding efficiency and results in herbicide resistant weed. In most cases, such a mutation will be associated with ecological fitness penalty under herbicide free environmental conditions. Here we describe the effect of various mutations, endowing resistance to acetyl-CoA carboxylase (ACCase) inhibitors, on the ecological fitness penalty of Lolium rigidum populations. The TS resistant populations, MH (substitution of isoleucine 1781 to leucine) and NO (cysteine 2088 to arginine), were examined and compared to a sensitive population (AL). Grain weight (GW) characterization of individual plants from both MH and NO populations, showed that resistant individuals had significantly lower GW compared with sensitive ones. Under high temperatures, both TS resistant populations exhibited lower germination rate as compared with the sensitive (AL) population. Likewise, early vigor of plants from both TS resistant populations was significantly lower than the one measured in plants of the sensitive population. Under crop-weed intra-species competition, we found an opposite trend in the response of plants from different populations. Relatively to inter-population competition conditions, plants of MH population were less affected and presented higher reproduction abilities compared to plants from both AL and NO populations. On the basis of our results, a non-chemical approach can be taken to favor the sensitive individuals, eventually leading to a decline in resistant individuals in the population.

Original languageAmerican English
Article number1078
JournalFrontiers in Plant Science
Volume8
DOIs
StatePublished - 22 Jun 2017

Bibliographical note

Publisher Copyright:
© 2017 Matzrafi, Gerson, Rubin and Peleg.

Keywords

  • ACCase inhibitors
  • Competition
  • Ecological fitness penalty
  • Germination
  • Lolium rigidum
  • Target-site resistance

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