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首页> 美国卫生研究院文献>Antioxidants >Physiological and Biochemical Dissection Reveals a Trade-Off between Antioxidant Capacity and Heat Tolerance in Bread Wheat (
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Physiological and Biochemical Dissection Reveals a Trade-Off between Antioxidant Capacity and Heat Tolerance in Bread Wheat (

机译：生理和生化解剖揭示抗氧化能力和面包小麦耐热性之间的权衡（

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Heat stress alters photosynthetic components and the antioxidant scavenging system, negatively affecting plant growth and development. Plants overcome heat stress damage through an integrated network involving enzymatic and non-enzymatic antioxidants. This study aimed to assess physiological and biochemical responses in contrasting thermo-tolerant wheat varieties exposed to 25 °C (control) and 35 °C (heat stress), during the seedling stage. Our results revealed a substantial decrease in the photosynthetic pigments, carotenoids, anthocyanin content, and increased membrane injury index, malondialdehyde, methylglyoxal (MG), H2O2 contents and lipoxygenase activity compared to non-stress wheat seedlings. The heat-tolerant variety BARI Gom 26 (“BG26”) maintained higher cellular homeostasis compared to the heat susceptible variety Pavon 76 (“Pavon”), perpetuated by higher accumulation of proline, glycine betaine, ascorbate-glutathione cycle associated enzymes, reduced glutathione and ascorbate concentration in plant cells. Significantly lower levels of MG detoxification and antioxidant activities and ascorbate-glutathione cycle-related enzymatic activities lead to increased susceptibility in variety “Pavon”. Hierarchical clustering and principal component analysis revealed that variety “BG26” possess a combination of biochemical responses tailoring antioxidant activities that induced a higher level of tolerance. Taken together, our results provide a pipeline for establishing a trade-off between antioxidant capacity and heat tolerance to facilitate functional genomics and translational research to unravel underlying mechanisms to better adapt wheat to heat stress.
机译：热应力改变光合成分和抗氧化清除系统，对植物生长和发育负面影响。植物通过涉及酶和非酶促抗氧化剂的综合网络克服热应激损伤。本研究旨在评估在幼苗阶段期间暴露于25℃（对照）和35℃（热应激）的热耐受小麦品种的生理生化反应。我们的研究结果显示，与非应力小麦幼苗相比，光合色素，类胡萝卜素，花青素含量和增加的膜损伤指数，丙二醛，甲基甘油（Mg），H 2 O 2含量和脂氧合酶活性的显着降低。与热易感品种PAVON 76（“PAVON”）相比，耐热性多种Bari GOM 26（“BG26”）保持更高的细胞稳态，通过脯氨酸，甘氨酸甜菜碱，抗坏血液 - 谷胱甘肽循环相关酶，降低谷胱甘肽植物细胞中的抗坏血酸浓度。显着较低较低的Mg解毒和抗氧化活性和抗坏血酸 - 谷胱甘肽循环相关的酶活性导致品种“PACON”的易感性增加。分层聚类和主要成分分析显示，各种“BG26”具有剪裁抗氧化活性的生化反应的组合，诱导较高水平的耐受性。我们的结果占用，我们的结果提供了一种管道，用于在抗氧化能力和耐热性之间建立权衡，以促进功能性基因组学和翻译研究，以更好地适应小麦来热应激。

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