| Identification of drought tolerance in foxtail millet during its entire growth period based on principal component analysis and membership function |
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| DOI：10.7606/j.issn.1000-7601.2022.06.04 |
| Key Words: foxtail millet drought stress principal component analysis discriminant analysis drought tolerance identification |
| Author Name | Affiliation | | XIAO Jibing | Liaoning Institute of Agriculture and Forestry in Arid Areas, Chaoyang, Liaoning 122000, China | | LIU Zhi | Liaoning Institute of Agriculture and Forestry in Arid Areas, Chaoyang, Liaoning 122000, China | | XIN Zongxu | Liaoning Institute of Agriculture and Forestry in Arid Areas, Chaoyang, Liaoning 122000, China | | LI Junzhi | Liaoning Institute of Agriculture and Forestry in Arid Areas, Chaoyang, Liaoning 122000, China | | CHEN Guoqiu | Liaoning Institute of Agriculture and Forestry in Arid Areas, Chaoyang, Liaoning 122000, China | | ZHU Xiaodong | Liaoning Institute of Agriculture and Forestry in Arid Areas, Chaoyang, Liaoning 122000, China | | SUN Zhanxiang | Liaoning Academy of Agricultural Science, Shenyang, Liaoning 110161, China |
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| Abstract: |
| This study aimed to screen drought tolerance materials and indices in foxtail millet germplasm resources to explore drought tolerance genes and improve the efficiency of drought tolerance breeding. A field experiment was conducted using a randomized incomplete block design (alpha\|lattice design) and repeated thrice in 2019-2020. Each experiment was consisted of 30 foxtail millet genotypes treated under drought stress (DS) and normal water supply (CK). The agronomic traits and drought tolerance coefficient of the genotypes were assessed during the entire growth period. The drought tolerance of foxtail millet was identified by the comprehensive evaluation index D. Combined analysis of variance showed that soil water environment and genotype significantly affected the indices. Besides, the interaction between genotype and soil water environment significantly affected the growth traits of foxtail millet，but not yield traits (except 1000-grain weight). The results of t\|test showed that the effect of drought stress was significant (except 1000-grain weight). Principal component analysis transformed eleven single drought tolerance evaluation indices into three independent comprehensive indices, and the cumulative contribution rate of variance reached 81.27%. The first principal component was equivalent to 5.866 original indices, which explained 53.327% variance, in which the absolute values of load coefficients of plant height, top second leaf area, dry weight of stem and leaf, spike length, spike weight and grain weight per spike were larger. The second principal component mainly reflected the top node length and kernels per spike. Stem node number, 1000-grain weight and yield played major role in the third principal component. According to the cluster analysis of the D-value unweighted pair\|group method with arithmetic means, the drought tolerance of foxtail millet was divided into five categories. Discriminant analysis showed that plant height and spike weight per plant should be used as indices for drought tolerance identification in foxtail millet. Based on principal component analysis and membership function, the comprehensive evaluation index D of drought tolerance of several agronomic traits should be used to identify drought tolerance during the entire growth period in foxtail millet. |
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