PQQ对低温胁迫下早稻幼苗生理特性的影响Effects of PQQ on Physiological Characteristics of Early Rice Seedlings Under Low Temperature Stress
何曙光;李华平;戴力;刘洋;匡炜;方宝华;赵杨;
摘要(Abstract):
以早稻品种湘早籼42号为材料,研究不同浓度的PQQ溶液对低温胁迫下早稻幼苗生理特性的影响。结果表明:低温胁迫前叶面喷施0.5和1 μmol/L PQQ溶液,活苗率较对照大幅提高,分别达到40.23%和43.14%,与对照差异显著;而PQQ溶液浓度≥25 μmol/L时活苗率反而降低;低温胁迫前喷施0.5 μmol/L的PQQ,对株高、鲜重、干重和含水量的影响与对照差异不显著;而低温胁迫5 d时,PQQ处理过的幼苗电导率降低了7.19个百分点、MDA含量减少了5.23 nmol/g、脯氨酸和可溶性糖含量分别增加了8.02 μg/g和23.4 mg/g、SOD和POD酶活性分别提升了9.19%和11.45%,与对照的差异均达显著水平。这表明PQQ可通过提高抗氧化酶活性和调节非酶促防御系统同时减轻低温胁迫对水稻幼苗造成的伤害,提高水稻幼苗耐冷能力。
关键词(KeyWords): 水稻幼苗;低温胁迫;PQQ;生理指标
基金项目(Foundation): 湖南省农业科技创新资金项目(2018QN07)
作者(Author): 何曙光;李华平;戴力;刘洋;匡炜;方宝华;赵杨;
Email:
DOI: 10.16498/j.cnki.hnnykx.2020.005.006
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