摘要： 为了提高小麦抗旱性,本试验选用6个肥水类型不同的小麦品种,在聚乙二醇-6000(PEG-6000)水分胁迫条件下考察了不同小麦品种种子的萌发状况和小麦幼苗的生理生化变化,并在防雨旱棚池栽条件下对品种的抗旱性进行了鉴定。结果表明,不同肥水类型小麦品种随着水分胁迫时间的延长胚芽鞘长度、相对发芽率和硝酸还原酶活性均降低,可溶性糖含量和丙二醛含量均升高,根系活力呈现先略微升高再下降的趋势。与水浇地品种相比,旱地品种青麦6号、济旱5034和鲁麦21的胚芽鞘长度较长,相对发芽率、硝酸还原酶活性和根系活力相对较高且下降缓慢,可溶性糖含量较高且随胁迫时间延长增加的幅度大,丙二醛含量积累的速度较为缓慢。其中,胚芽鞘长度、相对发芽率、硝酸还原酶活性和根系活力与抗旱性鉴定指标抗旱指数存在极显著相关性,可以作为小麦抗旱性鉴定的早期指标。

关键词: 小麦, 水分胁迫, 抗旱特性, 肥水类型

Abstract: The seed germination status and physiological and biochemical changes of wheat seedlings of six different fertilizer and water types of wheat were studied under the water stress of PEG-6000, and the drought resistance was identified under the condition of trough cultivation with rain-proof shelter.The results showed that the length of cole· optiles, relative germination rate and nitrate reductase activity decreased, the soluble sugar content and MDA content increased, the root activity revealed a appreciably increasing tendency and then declined with the water stress time. Compared with irrigated field cuhivars, the length of coleoptiles, relative germination rate, nitrate reduetase activity and the root activity of dry land cuhivam Qingmai 6, Jihan 5034 and Lumai 21 were relatively higher and decreased more slowly, the soluble sugar content was higher and its growth range was larger along with the stress time, MDA con— tent increased comparatively slowly.The length of coleoptiles, relative germination rate, nitrate reductase activity and root activity had a extremely significant relation with drought—resistance index, which could be considered as early.

Key words: heat, Water stress, Drought—resistance characteristics, Fertilizer and water types

中图分类号: 

• S512.1