Screening of Key Drought Tolerance Indices for Cotton at the Flowering and Boll Setting Stage Using the Dimension Reduction Method

• DOI: 10.3389/fpls.2021.619926
• Publication Date: 2021-07-09T09:40:30Z
• Authors: FengLei Sun; Qin Chen; QuanJia Chen; Menghui Jiang; Wenwei Gao; YanYing Qu
• Keywords: Drought Tolerance; Drought stress

Drought is one of the main abiotic stresses that seriously influences cotton production. Many indicators can be used to evaluate drought tolerance, but key remain determined. The objective this study was identify effective tolerance from 19 indices, including morphology, photosynthesis, physiology, and yield-related yield potential 104 varieties under both normal drought-stress field conditions. Combined with principal component analysis (PCA) a regression method, results showed top five PCs among 19, eigenvalues > 1, contributed 65.52, 63.59, 65.90% total variability during 2016 2018, respectively, which included plant height (PH), fruit branch number (EFBN), single boll weight (SBW), transpiration rate (Tr) chlorophyll (Chl). Therefore, indicator dimension decreased 5. A comparison 5 identified through PCA combined found final cluster on were basically consistent. indicated these traits could in combination screen or lines for breeding programs, Zhong R2016 Xin lu zao 45 exhibited high selected as superior parents good performance stress.