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22 October 2019 Growth, Fecundity, and Competition between Aryloxyphenoxypropionate-Resistant and -Susceptible Asia Minor Bluegrass (Polypogon fugax)
Wei Tang, Jie Chen, Xiaoyue Yu, Jianping Zhang, Yongliang Lu
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Abstract

Asia Minor bluegrass (Polypogon fugax Nees ex Steud.) is a problem grass weed of winter crops in China, where a population has become resistant to aryloxyphenoxypropionate (APP) herbicides. The mechanism of resistance is due to an Ile-2041-Asn mutation of the ACCase gene. Screen house experiments were conducted to study the growth, fecundity characteristics, and competitive ability of this aryloxyphenoxypropionate-resistant (APP-R) biotype compared with a susceptible (APP-S) biotype. When grown under noncompetitive conditions, the APP-R P. fugax developed more rapidly than the APP-S plants, with earlier tiller and panicle emergence and seed shedding; the APP-R P. fugax set seeds nearly 12 d earlier than the APP-S biotype. APP-R and APP-S biotypes had similar aboveground dry weight before the flowering stage. Fecundity of the APP-R biotype was similar to the APP-S biotype (8.57 g seeds plant–1 and 0.17 g seeds panicle–1 versus 8.22 g seeds plant–1 and 0.13 g seeds panicle–1, respectively). Ultimately, the relatively slower-developing APP-S P. fugax had 50% more shoot dry weight than the APP-R plants. Relative competitiveness among the APP-R and APP-S P. fugax biotypes was investigated through replacement series experiments. No difference in competitive ability was measured between APP-R and APP-S biotypes on the basis of shoot dry weight before the tillering stage. These results indicate that there is no apparent fitness penalty for the APP-R P. fugax. The shorter growth cycle of APP-R with no apparent fitness penalty suggests that growers will need begin weed control earlier and possibly include vegetative crops with an even shorter growth cycle in their rotations.

© Weed Science Society of America, 2019.
Wei Tang, Jie Chen, Xiaoyue Yu, Jianping Zhang, and Yongliang Lu "Growth, Fecundity, and Competition between Aryloxyphenoxypropionate-Resistant and -Susceptible Asia Minor Bluegrass (Polypogon fugax)," Weed Science 67(5), 546-551, (22 October 2019). https://doi.org/10.1017/wsc.2019.36
Received: 27 February 2019; Accepted: 25 June 2019; Published: 22 October 2019
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KEYWORDS
ACCase mutation
fitness
Herbicide resistance
relative competitiveness
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