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首页> 外文期刊>Acta Physiologiae Plantarum >Growth, proline accumulation and peroxidase activity in maize seedlings under osmotic stress
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Growth, proline accumulation and peroxidase activity in maize seedlings under osmotic stress

机译：渗透胁迫下玉米幼苗的生长，脯氨酸积累和过氧化物酶活性

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摘要

The influence of osmotic stress induced by polyethylene glycol (PEG) on plant growth, proline content and activities of soluble peroxidases was studied on 12 maize inbred lines at seedling stage. Reduction of plant growth, fresh weight and length of roots and shoots occurred in all of the studied genotypes and was followed by increase in free proline content of shoots and especially in roots of the majority of genotypes. Correlation analysis of changes in root proline content with growth parameters revealed direct positive correlation. Changes in root peroxidase activities ranged from approximately 40 % reduction to 20 % stimulation, depending on the genotype. It was shown that genotypes with higher proline changes under drought treatment exhibitedlower peroxidase activities. In addition, genotypes with less pronounced root growth reduction under stress conditions exhibited increased peroxidase activities, as well as lower proline content. In the field experiments, grain yield was positively correlated with root proline content and negatively with root length changes in drought-treated seedlings grown in laboratory conditions.
机译：在12个玉米自交系的苗期，研究了聚乙二醇（PEG）诱导的渗透胁迫对植物生长，脯氨酸含量和可溶性过氧化物酶活性的影响。在所有研究的基因型中，植物的生长，鲜重以及根和芽的长度均出现减少，随后芽中游离脯氨酸的含量增加，尤其是在大多数基因型的根中。根脯氨酸含量变化与生长参数的相关分析显示出直接正相关。根系过氧化物酶活性的变化范围从大约40％减少到20％刺激，具体取决于基因型。结果表明，干旱处理下脯氨酸变化较高的基因型表现出较低的过氧化物酶活性。此外，在胁迫条件下根系生长减少不明显的基因型表现出增加的过氧化物酶活性以及较低的脯氨酸含量。在田间试验中，在实验室条件下经过干旱处理的幼苗中，谷物产量与根脯氨酸含量呈正相关，与根长变化呈负相关。

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