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28 March 2024 Echinochloa crus-galli seedlings surviving florpyrauxifen-benzyl applications have a greater potential to produce resistant seeds
Guoqi Chen, Xiangxin Zhuang, Aatiqa Masoom, Yang Chen, Yunhua Gu, Jiahao Zhang
Author Affiliations +
Abstract

Florpyrauxifen-benzyl (FPB) is an important postemergence rice herbicide. This study tested the potential for seed production in an FPB-resistant barnyardgrass population. A barnyardgrass population (NL) collected from a rice field in eastern China was highly resistant to FPB with a GR50 dose (the FPB dose causing a 50% reduction in fresh weight of aboveground parts) of 50.2 g ai ha–1. No significant differences in the percentages of surviving seedlings after treatment with different doses of the herbicide were found between F1 lines collected from F0 plants surviving a 36 g ai ha–1 FPB treatment and those collected from nontreated control F0 plants. Additionally, no significant differences were found in the rate of surviving seedlings after treatment with varying doses of FPB among the F2 lines collected from F1 plants that survived varying doses of FPB. At a constant temperature of 30 C, seeds from different F1 and F2 lines showed germination percentages of 85% to 92.0% and 68.3% to 89.0%, respectively. In the absence of competition, plants from the NL population surviving 0–144 g ai ha–1 FPB showed no significant differences in plant height, dry weight of aboveground parts, effective accumulated temperature (EAT) from sowing to seed maturation, seed production per plant, or 1,000-seed weight. In the susceptible population (HJ), plants surviving 18 g ai ha–1 FPB showed no significant differences compared to the nontreated control plants of the same population for the above variables. This is the first report of FPB-resistant barnyardgrass in China. Barnyardgrass seedlings that survived FPB application showed a higher potential for accumulating in the soil seedbank and negatively affecting rice.

Nomenclature: Florpyrauxifen-benzyl (FPB); barnyardgrass, Echinochloa crus-galli (L.) P. Beauv.; rice, Oryza sativa L.

Guoqi Chen, Xiangxin Zhuang, Aatiqa Masoom, Yang Chen, Yunhua Gu, and Jiahao Zhang "Echinochloa crus-galli seedlings surviving florpyrauxifen-benzyl applications have a greater potential to produce resistant seeds," Weed Technology 38(1), 1-7, (28 March 2024). https://doi.org/10.1017/wet.2023.87
Received: 22 February 2023; Accepted: 21 November 2023; Published: 28 March 2024
KEYWORDS
F1 line
F2 line
Herbicide resistance
seed production
seed-setting course
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