Effects of elevated CO2 on the response of glyphosate resistant and susceptible Palmer amaranth (Amaranthus palmeri S. Wats.) to varying rates of glyphosate

IF 2.3 4区农林科学 Q1 AGRONOMY

Archives of Agronomy and Soil Science Pub Date : 2023-03-09 DOI:10.1080/03650340.2023.2173741

G. Runion, S. Prior, Mary K. Durstock, A. Sanz‐Saez, A. Price

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引用次数: 0

Abstract

ABSTRACT Repeated application of herbicides has led to herbicide-resistant weed populations. Elevated CO2 often increases weed growth, exacerbating problems including impacts on crop yield and weed control. How rising CO2 affects herbicide-resistant weeds remains largely unknown. Palmer amaranth (Amaranthus palmeri) populations resistant to or susceptible to glyphosate were exposed to ambient or elevated (ambient +200 μmol mol−1) concentrations of CO2 in open-top chambers. Two weeks after CO2 exposure, each population was sprayed with glyphosate at 0, 0.5×, 1.0×, or 1.5× the label rate. Afterwards, CO2 exposure continued for an additional two weeks when visual herbicide injury and leaf gas exchange were assessed. Plants were harvested for determination of treatment effects on growth. Elevated CO2 had little effect on most variables except for decreasing stomatal conductance (~25.5%) and increasing water use efficiency (~49.2%). Glyphosate resistant plants showed decreased height (9.8%) and damage (~56.4%) and increased root dry weight (12.1%), photosynthesis (~41.2%), stomatal conductance (~63.3%), and water use efficiency (~32.0%). In general, increasing rates of glyphosate decreased growth and gas exchange variables, which was frequently only seen in the susceptible ecotype. Data suggest that rising atmospheric CO2 is unlikely to affect Palmer amaranth, including control of glyphosate-resistant populations.

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CO2升高对抗草甘膦和敏感的苋菜(Amaranthus palmeri S. Wats.)对不同浓度草甘膦的反应的影响

摘要除草剂的反复使用导致了杂草种群的抗除草剂性。二氧化碳含量升高通常会增加杂草的生长，加剧问题，包括对作物产量和杂草控制的影响。不断上升的二氧化碳对抗除草剂杂草的影响在很大程度上仍然未知。抗草甘膦或易感草甘膦的Palmer amaranth（Amaranthus palmeri）种群在开放式室中暴露于环境或升高（环境+200μmol−1）浓度的CO2。暴露于二氧化碳两周后，每个群体以0、0.5倍、1.0倍或1.5倍的标记率喷洒草甘膦。之后，当评估视觉除草剂损伤和叶片气体交换时，CO2暴露又持续了两周。收获植物以测定处理对生长的影响。除降低气孔导度（~25.5%）和提高水分利用效率（~49.2%）外，CO2浓度升高对大多数变量的影响不大。草甘膦抗性植物的高度（9.8%）和危害（~56.4%）降低，根干重（12.1%）、光合作用（~41.2%）、气孔导度，草甘膦用量的增加降低了生长和气体交换变量，这通常只在易感生态型中出现。数据表明，大气中二氧化碳含量的上升不太可能影响帕尔默苋，包括对草甘膦抗性种群的控制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Archives of Agronomy and Soil Science AGRONOMY-SOIL SCIENCE

CiteScore

5.50

自引率

4.20%

发文量

107

期刊介绍： rchives of Agronomy and Soil Science is a well-established journal that has been in publication for over fifty years. The Journal publishes papers over the entire range of agronomy and soil science. Manuscripts involved in developing and testing hypotheses to understand casual relationships in the following areas: plant nutrition fertilizers manure soil tillage soil biotechnology and ecophysiology amelioration irrigation and drainage plant production on arable and grass land agroclimatology landscape formation and environmental management in rural regions management of natural and created wetland ecosystems bio-geochemical processes soil-plant-microbe interactions and rhizosphere processes soil morphology, classification, monitoring, heterogeneity and scales reuse of waste waters and biosolids of agri-industrial origin in soil are especially encouraged. As well as original contributions, the Journal also publishes current reviews.