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.

为了了解成熟剂在敏感作物中的生理作用，这项工作的目的是评估常用在甘蔗中的草甘膦，三苯甲酰胺-乙基和磺草胺甲基化剂的亚剂量对生菜栽培品种'露西•布朗（Lucy Brown）的影响。 ”和“ Vanda”。为了解决产品对生菜生理的影响，分析鲜重，干重，叶数，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（执行GPOX）。我们观察到，与抗倒酯和甲基磺草隆相比，在测试的产品中，草甘膦对植物的生长影响较小。所有产品均导致两个品种的叶绿素含量降低。叶绿素A荧光在“ Vanda”中被抗倒酯和甲基磺胺嘧啶甲基所抑制，并且未观察到“ Lucy Brown”的差异。MDA含量和酶定量随品种和甘蔗成熟度的变化而变化。通过扰乱光系统II的叶绿素含量和量子效率，通过这些甘蔗成熟剂没有直接作用于光系统II的作用方式，它们可以造成一定程度的破坏，并在不同的时间和响应压力下激活不同的机制。从这个意义上讲，有可能观察到草甘膦的剂量减少了，