Salt-Tolerance Evaluation and Physiological Response of Salt Stress of Broomcorn Millet (Panicum miliaceum L.)
YUAN YuHao1, YANG QingHua1, DANG Ke1, YANG Pu1, GAO JinFeng1, GAO XiaoLi1, WANG PengKe1, LU Ping2, LIU MinXuan2, FENG BaiLi,11 College of Agronomy, Northwest A&F University/State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling 712100, Shaanxi; 2 Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081
Abstract 【Objective】 To evaluate the tolerance of broomcorn millet cultivars to salt stress, explore the physiological responses of different salt-tolerant broomcorn millet to salt stress, and establish the salt tolerance identification index system of broomcorn millet, the salt tolerance of broomcorn millet was studied. 【Method】 The growth parameters of 100 genotypes of broomcorn millet at germination stage and the physiological parameters of different salt-tolerant broomcorn millet at seedling stage were measured under salt stress. The tolerance of each variety to salt stress was evaluated by correlation analysis, principal component analysis, cluster analysis and physiological responses to salt stress. 【Result】 the results showed that the measured values of each shoot in the germination stage under 1% NaCl solution stress were lower than that of the control. Correlation analysis showed that there was a significant correlation in the different germination indexes, and there was a significant negative correlation with the relative salt damage rate. The principal component analysis results showed root fresh weight, germination index and germination rate were the larger load in germination factors and these indexes were considered as the main indexes to identify salt tolerance of broomcorn millet germination. The 100 broomcorn millet cultivars were sorted four groups according to the cluster analysis. The cluster analysis results showed eleven cultivars such as Yixuandahongmi, Wujushu, Baishu etc. were classified into salt-tolerant cultivar group, four cultivars including Humengheinianmi, Xiaoheishu, Linheshuanglishu, and Shaan78 were classified into salt sensitive group. There were great differences between salt tolerant cultivars and salt sensitive cultivars in morphological structure and physiological indexes. The scanning electron microscope results showed salt bladders appeared on the surface of salt-tolerant cultivars, the stomatal aperture size was barely changed. The salt-sensitive cultivar showed the stomata were closed in salt-sensitive broomcorn millet cultivar, and the surface of the leaf become rough, and the guard cells death occurred. With the increase of treatment time, the salt tolerant cultivar chloroplast changed from ellipsoid to spherical and starch granules increase, membrane disrupted, grana lamella arranged loosely, the thylakoids swollen and even disintegrate. With the days of salt stress increasing, the relative conductivity were increased. However, the relative conductivity in salt-tolerant broomcorn millet cultivar were lower than salt-sensitive broomcorn millet cultivar. The decreasing of Fv/Fm、Y(Ⅱ) and NPQ in salt-tolerant broomcorn millet cultivar were less than salt-sensitive broomcorn millet cultivar. 【Conclusion】 1% NaCl solution could be used as the suitable concentration of salt tolerance in broomcorn millet. The results showed that salt tolerance evaluation of broomcorn millet was affected with multiple indexes, and root fresh weight, germination index and germination rate could be used as the evaluation indexes of salt tolerance in germination stage. Stomatal state and chloroplast structures could be used as the cytology indexes of salt tolerance evaluation. The relative conductivity and chlorophyll fluorescence coefficient could be used as the physiology indexes of salt tolerance evaluation. Keywords:broomcorn millet;NaCl stress;salt tolerance screening;physiological response
PDF (5899KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 袁雨豪, 杨清华, 党科, 杨璞, 高金锋, 高小丽, 王鹏科, 陆平, 刘敏轩, 冯佰利. 糜子资源耐盐性评价与盐胁迫生理响应[J]. 中国农业科学, 2019, 52(22): 4066-4078 doi:10.3864/j.issn.0578-1752.2019.22.011 YUAN YuHao, YANG QingHua, DANG Ke, YANG Pu, GAO JinFeng, GAO XiaoLi, WANG PengKe, LU Ping, LIU MinXuan, FENG BaiLi. Salt-Tolerance Evaluation and Physiological Response of Salt Stress of Broomcorn Millet (Panicum miliaceum L.)[J]. Scientia Acricultura Sinica, 2019, 52(22): 4066-4078 doi:10.3864/j.issn.0578-1752.2019.22.011
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