Location: Adaptive Cropping Systems LaboratoryTitle: Climate change can accelerate Echinochloa colona resistance evolution to ACCase-inhibitor herbicide
|REFATTI, JOAO - Federal University Of Pelotas|
|DE AVILA, LUIS - Federal University Of Pelotas|
|CARMARGO, EDNALVO - Federal University Of Pelotas|
|OLIVEIRA, CLAUDIA - Federal University Of Pelotas|
|SALA-PEREZ, REIOFELI - University Of Arkansas|
|ROMA-BURGOS, NILDA - University Of Arkansas|
Submitted to: Frontiers in Plant Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/23/2019
Publication Date: N/A
Interpretive Summary: Environmental change, including rising temperature and increasing carbon dioxide concentration [CO2], can change weed biology. However, it is unclear how these changes, in turn, can alter our ability to control the weeds through chemical (herbicide) use. The current research was to assess how rising CO2 and temperature could alter jungle rice, (Echinochloa colona), an important weed in rice, (rice being an important global crop). Two different biotypes of the weed were used, one being sensitive to herbicides, the other resistant to multiple herbicides. The results indicated that CO2 and/or temperature did not affect the ability of the herbicide to control susceptible jungle rice, but reduced the ability of the herbicide to control multiple resistant jungle rice. These data suggest that climate change, especially CO2 and temperature, will make control of weeds that are already resistant to herbicides much more difficult. The information will be of interest to growers, herbicide manufacturers, the scientific community and consumers.
Technical Abstract: Environmental change, including rising temperature and increasing carbon dioxide concentration [CO2], can alter the growth and physiology of weedy plants. These changes could, potentially, alter herbicide efficacy, crop-weed interaction, and weed management. The objectives of the current research were to quantify the effects of increased atmospheric [CO2] and temperature on absorption, translocation and efficacy of cyhalofop-butyl on multiple-resistant (MR) and susceptible Echinochloa colona ecotypes. E. colona, or junglerice, is a troublesome weed in rice and in agronomic and horticultural crops worldwide. Maximum 14C-cyhalofop-butyl absorption occurred at 120 h after herbicide treatment with >97% of cyhalofop-butyl retained in the treated leaf regardless of [CO2], temperature, or ecotype. Neither temperature nor [CO2] affected herbicide absorption into the leaf. The mobility of herbicide was slightly reduced in the MR plants vs. S plants either under elevated [CO2] or temperature. Although plants grown under high [CO2] or high temperature were taller than those in ambient conditions, neither high [CO2] nor high temperature affected the herbicide efficacy on susceptible plants. However, herbicide efficacy was reduced on MR plants grown under high [CO2] or high temperature compared to MR plants at ambient conditions. High [CO2] and high temperature increased the resistance level of multiple-resistant Echinochloa colona to cyhalofop-butyl.