Comparison of WeatherMax<sup>®</sup>and Engame<sup>TM</sup>Formulations of Glyphosate on Cotyledon Surface Structure, Chlorophyll A Fluorescence and Shikimate Levels in Isogenic Cotton Cultivars Differing in Roundup Resistance

• 作者: Kevin C. Vaughn
• 来源期刊: 美国植物学期刊(英文)
• 学科: 数学
• 关键词: GLYPHOSATE Engame^TM WeatherMax^® Cuticle Damage SHIKIMATE Uptake
• 年，卷（期）: mgzwxqkyw_2020,（8）
• 页码范围: 1193-1205
• 页数: 13页
• 分类号: O17

摘要

The effects of Roundup </span><span><span style="font-family:Verdana;">WeatherMax</span>^{<span style="font-family:Verdana;">^&reg;</span>}</span></span><span><span><span style="font-family:Verdana;"> and </span><span style="font-family:Verdana;">Engame^TM</span></span></span><span><span><span style="font-family:Verdana;"> formulations of glyphosate were investigated on the cotyledons of glyphosate resistant (GR) and glyphosate sensitive (GS) isogenic cotton cultivars. </span><span style="font-family:Verdana;">Engame^TM</span></span></span><span><span><span style="font-family:Verdana;"> is a mixture of glyphosate and 1-aminomethanamide dihydrogen tetraoxosulfate (AMADS). Fully expanded cotton cotyledons treated with </span><span style="font-family:Verdana;">Engame^TM</span></span></span><span><span><span style="font-family:Verdana;"> or AMADS developed surface lesions within 2 hours after treatment whereas surfactant-treated control or </span><span><span style="font-family:Verdana;">WeatherMax</span>^{<span style="font-family:Verdana;">^&reg;</span>}</span></span></span><span><span><span style="font-family:Verdana;">-treated tissues did not develop lesions. The </span><span style="font-family:Verdana;">Engame^TM</span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;"> and AMADS damage appeared as depressions which were confirmed </span><span style="font-family:Verdana;">by scanning electron microscopy. Light micrographs of cross sections</span><span style="font-family:Verdana;"> through the depressions revealed collapsed and compressed epidermal and mesophyll cells with congealed cytoplasmic contents in the palisade and spongy mesophyll cells. Changes to photosynthetic electron transport were evident at 4 hours after treatment (HAT) in all treatments as revealed by chlorophyll A fluorescence. In GR cotton, the fluorescence perturbations decreased with time such that at 72 HAT </span></span><span styl