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首页> 外文期刊>Crop & Pasture Science >Exogenous application of 5-aminolevulinic acid improves low- temperature stress tolerance of maize seedlings
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Exogenous application of 5-aminolevulinic acid improves low- temperature stress tolerance of maize seedlings

机译：5-氨基乙酰丙酸的外源性应用提高了玉米幼苗的低温胁迫耐受性

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The important plant growth regulator 5-aminolevulinic acid (ALA) could promote low-temperature stress tolerance of many plants; however, the underlying mechanisms remain to be elucidated. We investigated the effects of exogenously applied ALA on seedling morphology, antioxidant enzyme activity and photosynthetic capacity of maize (Zea mays L.) seedlings under low-temperature stress. Two cultivars, low-temperature-sensitive cv. Suiyu 13 (SY13) and low-temperature-tolerant cv. Zhengdan 958 (ZD958), were subjected to four treatments: low-temperature without ALA treatment, low-temperature after ALA treatment, normal temperature without ALA treatment, and normal temperature after ALA treatment. Plant morphological growth, proline content, antioxidant enzyme activity and photosynthetic capacity were determined. ALA treatment significantly decreased the inhibitory effects of low-temperature stress on seedling dry weight and increased proline accumulation under low temperatures in ZD958. Pre-application of ALA significantly improved superoxide dismutase and catalase activities in SY13 under low-temperature stress. Furthermore, treating maize seedlings with ALA resulted in significant enhancement of ribulose-1,5-bisphosphate (RuBP) carboxylase activity under low-temperature stress in both cultivars. Pre-treatment with ALA relieved the damage caused by low-temperature stress to maize seedlings, particularly in the low-temperature-sensitive cultivar. Therefore, ALA at appropriate concentrations may be used to prevent reductions in maize crop yield due to low-temperature stress.
机译：重要的植物生长调节剂5-氨基纤维素酸（ALA）可以促进许多植物的低温胁迫耐受性;但是，潜在的机制仍有待阐明。我们调查了外源应用ALA在低温胁迫下对玉米（Zea mays L.）幼苗的幼苗形态，抗氧化酶活性和光合作用的影响。两种品种，低温敏感的CV。 Suiyu 13（SY13）和低温耐受性CV。郑丹958（ZD958）进行了四种治疗方法：低温无ALA处理，低温后ALA处理后，常温无ALA处理，ALA处理后常温。确定植物形态生长，脯氨酸含量，抗氧化酶活性和光合容量。 ALA治疗显着降低了低温应激对幼苗干重的抑制作用，ZD958低温下的脯氨酸积累增加。在低温胁迫下，ALA的预施用显着改善了SY13中的超氧化物歧化酶和过氧化氢酶活性。此外，用ALA处理玉米幼苗导致在两种品种的低温胁迫下显着提高核糖糖-1,5-双磷酸盐（RUBP）羧基酶活性。用ALA预处理缓解了低温胁迫对玉米幼苗引起的损伤，特别是在低温敏感的品种中。因此，在适当浓度下ALA可用于防止由于低温胁迫导致的玉米作物产量的降低。

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