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首页> 外文期刊>Turkish Journal of Botany >Impact of soil drought stress on photochemical efficiency of photosystem II and antioxidant enzyme activities of Phaseolus vulgaris cultivars
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Impact of soil drought stress on photochemical efficiency of photosystem II and antioxidant enzyme activities of Phaseolus vulgaris cultivars

机译：土壤干旱胁迫对菜豆光化学系统II光化学效率和抗氧化酶活性的影响

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摘要

Common bean (Phaseolus vulgaris L.) cultivars (cvs) (G?ynük 98, Karaca?ehir 90, ?ehirali 90, ES 855, and Yunus 90) were subjected to drought stress in order to assess the levels of drought tolerance through the analysis of growth parameters, leaf water potential (psi_{leaf}), stomatal conductance (g_s), chlorophyll (chl) content, and lipid peroxidation. Significant differences were recorded among cultivars in most traits. Yunus 90 was identified as the most tolerant, and Karaca?ehir 90 was the most sensitive. Furthermore, the changes in antioxidant enzyme activities, H_2O_2 content, and Photosystem II were investigated under drought stress, where Antioxidant enzyme activities increased while H_2O_2 contents decreased. In Yunus 90, increases in catalase (CAT) and ascorbate peroxidase (APX) activities were higher than those of the other cvs. Increase in GPX activity was higher in Karaca?ehir 90 compared to Yunus 90. Drought stress reduced quantum yield of PS II photochemistry (phi_{PSII}) and photochemical quenching (qP) in all cultivars. The reduction was more pronounced in Karaca?ehir 90. These results showed that different common bean cvs had different photochemical efficiencies and used different antioxidant enzymes in order to scavenge reactive oxygen species.
机译：对普通豆（Phaseolus vulgaris L.）品种（cvs）（G？ynük98，Karaca？ehir 90，？ehirali 90，ES 855和Yunus 90）进行干旱胁迫，以评估其耐旱水平。生长参数，叶水势（ psi_ {leaf}），气孔导度（g_s），叶绿素（chl）含量和脂质过氧化的分析。在大多数性状的品种之间记录到显着差异。尤努斯90被认为是最宽容的，而卡拉卡瑟希尔90是最敏感的。此外，研究了干旱胁迫下抗氧化酶活性，H_2O_2含量和光系统II的变化，其中抗氧化酶活性增加而H_2O_2含量减少。在Yunus 90中，过氧化氢酶（CAT）和抗坏血酸过氧化物酶（APX）活性的增加高于其他cvs。与Yunus 90相比，Karacafehir 90中GPX活性的增加更高。干旱胁迫降低了所有品种PS II光化学（ phi_ {PSII}）和光化学猝灭（qP）的量子产率。在Karaca？ehir 90中，这种降低更为明显。这些结果表明，不同的普通豆类cvs具有不同的光化学效率，并且使用不同的抗氧化剂来清除活性氧。

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