In order to understand the physiological effects of ripeners in sensitive crops, the objective of this work was to evaluate the effect of subdoses of the ripeners glyphosate, trinexapac-ethyl and sulfometuron methyl commonly used in sugarcane, in the growth of lettuce cultivar ‘Lucy Brown’ and ‘Vanda’. To address the effects of the products in the lettuce physiology, analyses of fresh weight, dry weight, number of leaves, chlorophyll content, quantum efficiency of photosystem II, lipid peroxidation (MDA), hydrogen peroxide (H₂O₂), glutathione reductase (GR), guaiacol peroxidase (GPOX) were performed. We observed that among the products tested, glyphosate had minor impact on plant growth, compared to trinexapac-ethyl and sulfometuron methyl. All products induced a decrease in chlorophyll content for both cultivars. Chlorophyll A fluorescence suffered a major reduction with trinexapac-ethyl and sulfometuron methyl in ‘Vanda’ and no differences were observed for ‘Lucy Brown’. MDA content and enzyme quantification varied by cultivar and the sugarcane ripener tested. By disturbing chlorophyll content and quantum efficiency of photosystem II, through these sugarcane ripeners did not have direct mode of action affecting photosystem II, they can cause some level of damage and activate different mechanisms and at different times, in response to stress. In this sense, it is possible to observe that reduced doses of glyphosate, trinexapac ethyl, and sulfometuron methyl affect the development of lettuce at different levels and trigger an oxidative response that was cultivar dependent.

为了了解催熟剂对敏感作物的生理影响，本工作的目的是评估甘蔗中常用的催熟剂草甘膦、抗倒酯和甲磺隆的亚剂量对生菜品种“Lucy Brown”生长的影响。 ”和“万代”。为了解决产品对生菜生理学的影响，分析了鲜重、干重、叶片数量、叶绿素含量、光系统 II 的量子效率、脂质过氧化 (MDA)、过氧化氢 (H ₂ O ₂ )、谷胱甘肽还原酶(GR)、愈创木酚过氧化物酶( GPOX)进行。我们观察到，在测试的产品中，与抗倒酯和甲磺隆相比，草甘膦对植物生长的影响较小。所有产品都会导致两个品种的叶绿素含量下降。 '万代兰' 中叶绿素 A 荧光因抗倒酯和甲磺隆而显着降低，而'露西布朗' 中未观察到差异。 MDA 含量和酶定量因品种和测试的甘蔗催熟剂而异。通过干扰光系统 II 的叶绿素含量和量子效率，这些甘蔗催熟剂没有直接影响光系统 II 的作用方式，但它们可以造成一定程度的损害，并在不同时间激活不同的机制，以应对胁迫。从这个意义上说，可以观察到草甘膦、抗倒酯和甲磺隆剂量的减少会不同程度地影响生菜的发育，并引发品种依赖性的氧化反应。