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《Journal of Nuclear Agricultural Sciences》 2018-02
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Correlation and Path Analysis of the Yield Folium Isatidis and Radix Isatidis Yield Per Plant and Main Agronomic Traits in Isatis indigotica Fort.

WANG Enjun;CHEN Yuan;HAN Duohong;CAI Ziping;ZHANG Fenqin;ZHANG Yong;Gansu Provincial Engineering Research Center for Medical Plant Cultivation and Breeding/Gansu Provincial Key Laboratory of Good Agricultural Production for Traditional Chinese Medicines/College of Agronomy,Gansu Agricultural University;Agriculture and Biology College,Hexi University;Gansu Cultivated Engineering and Technology Research Center of Standardization and Traceability for Characteristic Chinese Medicine , Gansu Engineering Laboratory of Resource Reservation and Utilization for Characteristic Medical Plants , Gansu Tasly Zhongtian Pharmaceutical Co.,Ltd;  
The purpose of this study was to analyze the variation of agronomic traits and to explore the traits controlling the yielding of medical Isatis indigotica Fort. in anticipation of to provide important information for germplasm evaluation and innovation to select the high yielding Isatis indigotica varieties. In this study,11 agronomic traits of 18 Isatis indigotica varieties were analyzed. The correlation,multiple linear regression analysis and path analysis were conducted,whilst integrated the growth status of Isatis indigotica and applied critical-path analysis,to identify the primary indexes of Folium Isatidis and Radix Isatidis yield. The results showed that the variation coefficient of agronomic traits of Isatis indigotica reached 9. 83% to 69. 22% . Among the main agronomic traits,the weight of fresh root( RFW),the weight of fresh leaf( LFW) and the leaf area( LAF) had the most variation in related traits that there were more than 60% of all,the yield of Folium Isatidis and Radix Isatidis had less variation that there were more than 50% of all,taking the second place while the root diam( RD),the root length( RL),leaf and root dry matter content( LDM and RDM) traits had the least variation ratio. The yield of Folium Isatidis was positively correlated with other agronomic traits significantly,in which leaf and root dry matter content were not included. The yield of Radix Isatidis was positively correlated with other agronomic traits significantly,while was negative correlated with the dry matter content of leaf and root. Regression models,which successfully forecasted the relationships not only between agronomic traits but also between the yield of Folium Isatidis and Radix Isatidis were established by step wise regression analysis. Statistical test was performed and the results showed that the correlation coefficient was significant,the coefficients of the yield of Folium Isatidis and Radix Isatidis were 0. 989 and 0. 982,respectively. Furthermore,path analysis indicated that the main factors that influenced Folium Isatidis yield were leaf number( 0. 715),leaf FW( 0. 594),root FW( 0. 140) and number of branch root( 0. 131). On the other hand,the main factors that influenced Radix Isatidis yield were root length( 0. 837) and root FW( 0. 592). Isatis indigotica germplasm had high-level genetic diversity. In addition,the extremely significant correlation between agronomic traits was clearly indicated. The major determining factors of Folium Isatidisr yield were leaf number,leaf FW,root FW and number of branch root. The high Folium Isatidisr yield varieties had more leaves,higher weight of leaf and root and more branch root numbers. The major determining factors of Radix Isatidis yield were root length and root FW. The high Radix Isatidis yield varieties had more longer root and higher weight of root FW. This research provides a theoretical basis for the germplasm resources identification and new variety breeding of Isatis indigotica Fort.
【Fund】: 国家中药标准化研究项目(ZYBZH-Y-GS-11);; 甘肃省高等学校科研项目(2015A-0142);; 河西学院青年基金项目(QN201409);; 校企合作项目(YLQT201605010)
【CateGory Index】: S567.239
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