摘要
为合理利用现有玉米种质资源,培养干旱耐性玉米品系提供理论基础。通过对生长15天的‘郑58’和‘PH4CV’进行干旱、正常浇水和干旱后复水3种处理,观察其表型差异及测定与抗旱性相关的生理指标。结果显示,干旱条件下‘PH4CV’苗期叶温较低、离体叶片失水较快。干旱处理5天后,‘PH4CV’幼苗表现出较‘郑58’更为严重的萎蔫表型,其组织相对含水量较低,积累了较多的H2O2和丙二醛(MDA),具有更高的电解质渗出率。干旱处理后‘郑58’与‘PH4CV’根冠比均有所增加,而‘郑58’的增加幅度更大。综上所述,‘郑58’苗期干旱处理下各项生理生化指标均显著优于‘PH4CV’,干旱耐性相对较强。
The aims are to rationally use the maize germplasm resource and provide basis for breeding maizevarieties with drought tolerance. The 15-day-old seedlings‘Zheng58＇and‘PH4 CV＇were used as materialsfor three treatments, drought, normal irrigation, and re-water after drought. The phenotypic difference anddrought-relevant physiological indexes were observed. The results showed that, under the drought treatment,leaf temperature of‘PH4 CV＇seedlings was lower, and water loss was faster in detached leaves of‘PH4 CV＇.After drought treatment for 5 days, seedlings of‘PH4 CV＇showed more severe wilting than‘Zheng58＇,accompanied with lower relative water content, accumulated more H2 O2 and MDA, and had higher ionicleakage level. The root/shoot ratio increased in both‘PH4 CV＇and‘Zheng58＇after drought treatment, and theratio was much higher in‘Zheng58＇. In conclusion, the drought-relevant physiological indexes of‘Zheng58＇are better than that of‘PH4 CV＇, indicating that the variety has more tolerance to drought stress at seedlingsstage.
出处
《中国农学通报》
2017年第35期18-24,共7页
Chinese Agricultural Science Bulletin
基金
国家自然科学基金重点研究项目"气孔发育及其调控玉米逆境适应的分子机制"(31430061)
河南省教育厅科学技术研究重点项目"玉米ETI1基因的克隆及功能分析"(14A180032)
河南大学科研基金项目"HS07调节拟南芥重金属汞胁迫的机制研究"(zzjj20140055)
