关键词: 小麦, 萌发期, 盐碱胁迫

Abstract: Salt and alkali stress tests were carried out on 283 wheat germplasm resources at germination stage by using 150 mmol·L-1NaCl and 100 mmol·L-1 NaHCO3/ Na2CO3 mixture （1∶1） solutions to simulate salt and alkali stress, respectively. Saline-alkali tolerance characteristics of wheat germplasm resources were comprehensively analyzed based on 11 trait indexes. The results showed that there were significant differences between the 11 indexes for 283 wheat germplasm resources under salt and alkali stress. Under NaCl stress, the variations of germ length, germ fresh weight and germ dry weight were larger. Under alkali stress, radicle length, radicle fresh weight and radicle dry weight varied greatly. The correlation analysis of membership function values showed that there were different degrees of correlations among the different traits, and there were differences among the traits under saline-alkali stress. Eight traits with large coefficient of variation were selected for principal component analysis, which were summarized into four principal components. The cumulative contribution rates of salt and alkali stress were 76.2% and 83.59%, respectively. After cluster analysis, 283 wheat materials under salt and alkali stress were divided into 3 categories, and 10 saline-alkali resistant materials were selected, which were Baimangmai, f106, Heshangtou, Sifangmai, Zhoubao, Zhongliang22, f78, Youzi, Heshangmai and Ailiduo. The results provided a reference for the cultivation of salt-alkali tolerant wheat during germination and research on the mechanism of saline-alkali stress in wheat.

Key words: wheat, germination period, saline alkali stress