孕穗期甜高粱耐盐性综合评价

袁闯; 陆安桥; 朱林; 许兴

Comprehensive evaluation of salt tolerance of sweet sorghum at booting stage

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DOI：10.7606/j.issn.1000-7601.2019.06.08

Key Words: sweet sorghum booting stage salt tolerance comprehensive evaluation

Author Name	Affiliation
YUAN Chuang	College of Agronomy, Ningxia University, Yinchuan, Ningxia 750021, China
LU Anqiao	College of Agronomy, Ningxia University, Yinchuan, Ningxia 750021, China
ZHU Lin	Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest, Ministry of Education China of Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021, China State Key Laboratory Breeding Base of Land Degradation and Ecological Restoration of Northwest China,Ningxia University, Yinchuan, Ningxia 750021, China
XU Xing	College of Agronomy, Ningxia University, Yinchuan, Ningxia 750021, China Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest, Ministry of Education China of Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021, China

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Abstract:

Twenty two of sweet sorghum varieties were selected as test materials, and two soils, mild saline\|alkali soil (0.589 g·kg^-1 salt content, pH 8.42) and heavy saline\|alkali soil (5.448 g·kg^-1 salt content, pH 9.23), were used in this experiment. Fifteen indicators including plant height (PH), stem diameter (SD), leaf area (LA), relative chlorophyll content (SPAD), net photosynthetic rate (Pn) and yield (Y) were determined at booting stage. Based on the salt tolerance coefficient of each index, correlation analysis, principal component analysis, membership function and cluster analysis were used to comprehensively evaluate and classify the salt tolerance of different sweet sorghum varieties at booting stage. The results showed that compared with mild saline\|alkali stress, the indexes of PH, CD, LA and SPAD were significantly decreased under severe saline\|alkali stress. Correlation analysis indicated that PH was significantly and negatively correlated with Tr but positively correlated with Pn and Gs, respectively. There were significant positive correlations between CD and Pn，PWC and Fv/Fm， and Fv/F0 and Y. The LA had extremely significant positive correlation with Fv/Fm、Fv/F0 and Fm. The Fv/Fm had extremely significant positive correlation with Fv/F0 and Fm. There were extremely significant positive correlations between Pn and Gs, and Fv/F0 and Fm. There was significant negative correlation between Pn and Tr. Cluster analysis categorized 22 sweet sorghum varieties into 5 categories: Class I (2 highly salt\|tolerant varieties), Class II (5 moderate salt\|tolerant varieties), Class III (5 salt\|tolerant varieties), Class IV (7 sensitive varieties), and Class V (3 highly sensitive varieties). The study selected two highly salt\|tolerant varieties including F6059 and F6043, and selected three highly sensitive varieties including F6372, F6229 and F6271.