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Substrate Application of 5-Aminolevulinic Acid Enhanced Low-temperature and Weak-light Stress Tolerance in Cucumber (Cucumis sativus L.)
Agronomy ( IF 3.949 ) Pub Date : 2020-03-29 , DOI: 10.3390/agronomy10040472
Ali Anwar , Jun Wang , Xianchang Yu , Chaoxing He , Yansu Li

5-Aminolevulinic acid (ALA) is a type of nonprotein amino acid that promotes plant stress tolerance. However, the underlying physiological and biochemical mechanisms are not fully understood. We investigated the role of ALA in low-temperature and weak-light stress tolerance in cucumber seedlings. Seedlings grown in different ALA treatments (0, 10, 20, or 30 mg ALA·kg−1 added to substrate) were exposed to low temperature (16/8 ˚C light/dark) and weak light (180 μmol·m−2·s−1 photosynthetically active radiation) for two weeks. Treatment with ALA significantly alleviated the inhibition of plant growth, and enhanced leaf area, and fresh and dry weight of the seedlings under low-temperature and weak-light stress. Moreover, ALA increased chlorophyll (Chl) a, Chl b, and Chl a+b contents. Net photosynthesis rate, stomatal conductance, transpiration rate, photochemical quenching, non-photochemical quenching, actual photochemical efficiency of photosystem II, and electron transport rate were significantly increased in ALA-treated seedlings. In addition, ALA increased root activity and antioxidant enzyme (superoxide dismutase, peroxidase, and catalase) activities, and reduced reactive oxygen species (hydrogen peroxide and superoxide radical) and malondialdehyde accumulation in the root and leaf of cucumber seedlings. These findings suggested that ALA incorporation in the substrate alleviated the adverse effects of low-temperature and weak-light stress, and improved Chl contents, photosynthetic capacity, and antioxidant enzyme activities, and thus enhanced cucumber seedling growth.

中文翻译:

5-氨基乙酰丙酸增强黄瓜的低温和弱光胁迫耐受性的底物应用

5-氨基乙酰丙酸(ALA)是一种非蛋白质氨基酸,可促进植物耐逆性。但是,尚未完全了解潜在的生理和生化机制。我们调查了ALA在黄瓜幼苗的低温和弱光胁迫耐受性中的作用。将在不同ALA处理下生长的幼苗(向基质中添加0、10、20或30 mg ALA·kg -1)暴露于低温(16/8˚C光照/黑暗)和弱光(180μmol·m -2)下·s -1光合有效辐射)持续两周。在低温和弱光胁迫下,ALA处理显着减轻了对植物生长的抑制作用,增强了叶面积,并增强了幼苗的鲜重和干重。此外,ALA增加了叶绿素(Chl)a,Chl b和Chl a + b内容。在ALA处理的幼苗中,净光合速率,气孔导度,蒸腾速率,光化学猝灭,非光化学猝灭,光系统II的实际光化学效率和电子传输速率均显着增加。此外,ALA增加了黄瓜幼苗根和叶的根系活性和抗氧化酶(超氧化物歧化酶,过氧化物酶和过氧化氢酶)活性,并减少了活性氧(过氧化氢和超氧化物基)和丙二醛的积累。这些发现表明,在基质中掺入ALA减轻了低温和弱光胁迫的不利影响,并改善了Chl含量,光合能力和抗氧化酶活性,从而增强了黄瓜幼苗的生长。
更新日期:2020-03-29
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