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Exogenous application of β-sitosterol mediated growth and yield improvement in water-stressed wheat (Triticum aestivum) involves up-regulated antioxidant system.
Journal of Plant Research ( IF 2.8 ) Pub Date : 2019-10-12 , DOI: 10.1007/s10265-019-01143-5
Amr Elkeilsh 1 , Yasser M Awad 2 , Mona H Soliman 3, 4 , Abdelghafar Abu-Elsaoud 1 , Magdi T Abdelhamid 5 , Ibrahim M El-Metwally 5
Affiliation  

Water stress reduces crop production significantly, and climate change has further aggravated the problem mainly in arid and semi-arid regions. This was the first study on the possible effects of β-sitosterol application in ameliorating the deleterious changes in wheat induced by water stress under field condition and drip irrigation regimes. A field experiment with the split-plot design was conducted, and wheat plants were foliar sprayed with four β-sitosterol (BBS) concentrations (0, 25, 75, and 100 mg L-1) and two irrigation regimes [50 and 100% of crop evapotranspiration (ETc)]. Water stress without BBS treatment reduced biological yield, grain yield, harvest index, and photosynthetic efficiency significantly by 28.9%, 42.8%, 19.6%, and 20.5% compared with the well-watered plants, respectively. Proline content increased in water-stressed and BSS-treated plants, owing to a significant role in cellular osmotic adjustment. Application of BSS was effective in reducing the generation of hydrogen peroxide (H2O2) and hence the malondialdehyde content significantly in water-stressed and well-watered wheat plants. Application of BSS up-regulated the activity of antioxidant enzymes (SOD, CAT, POD, and APX) significantly and increased the content of tocopherol, ascorbic acid, and carotene thereby reducing the levels of reactive oxygen species. The increased antioxidant system in BSS treated plants was further supported by the expression level of SOD and dehydrin genes in both water-stressed and well-watered plants. In the present study, the application of BBS at 100 mg L-1 was beneficial and can be recommended for improving the growth and yield of the wheat crop under water stress.

中文翻译:

在水分紧缺的小麦(Triticum aestivum)中外源应用β-谷甾醇介导的生长和产量提高涉及抗氧化系统的上调。

水分胁迫极大地降低了作物产量,气候变化进一步加剧了主要在干旱和半干旱地区的问题。这是首次研究β-谷甾醇对缓解田间条件和滴灌条件下水分胁迫引起的小麦有害变化的可能影响。进行了采用分区设计的田间试验,并向小麦植株的叶面喷洒了4种β-谷甾醇(BBS)浓度(0、25、75和100 mg L-1)和两种灌溉方式[50和100%蒸散量(ETc)]。与水分充足的植物相比,未经BBS处理的水分胁迫分别使生物产量,谷物产量,收获指数和光合效率分别降低了28.9%,42.8%,19.6%和20.5%。水分胁迫和BSS处理的植物中脯氨酸含量增加,这归因于细胞渗透调节的重要作用。BSS的应用可有效减少过氧化氢(H2O2)的产生,因此在水分紧缺和水分充足的小麦植株中丙二醛含量显着降低。BSS的应用显着上调了抗氧化酶(SOD,CAT,POD和APX)的活性,并增加了生育酚,抗坏血酸和胡萝卜素的含量,从而降低了活性氧的含量。BSS处理过的植物中抗氧化系统的增强得到了水分胁迫和水分充足植物中SOD和脱水素基因表达水平的进一步支持。在目前的研究中,
更新日期:2019-11-01
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