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Peanut is a calcium-preferring crop,and calcium deficiency is common in acidic soils,which severely affects the yield and quality of peanut.Breeding low-calcium-tolerant peanut varieties is an economic and efficient solution.In this study,170 peanut germplasms from domestic and foreign sources were used as experimental materials.A field experiment was conducted using a randomized complete block design with three replications in acidic low-calcium soil(pH 5.6,exchangeable calcium 3.9 cmol/kg) located in Liuyang City,Hunan Province,and the calcium oxide(CaO) was adopted as the calcium source.Two treatments were set up as:low calcium treatment(0 kg/ha) and normal calcium treatment(750 kg/ha).Twenty-five key traits,including plant morphology,physiological characteristics,yield components,and nutritional quality were determined from the seedling stage to the mature stage.Through correlation analysis,principal component analysis(PCA),cluster analysis,and comprehensive evaluation,it was aimed in this study to provide high-quality germplasm resources for the improvement of low-calcium-tolerant peanut varieties.The results are summarized as follows:(1)Correlation analysis showed that the low-calcium tolerance coefficient of pod yield per plant was extremely significantly and positively correlated with the low-calcium tolerance coefficients of full pod number per plant and total pod number per plant.(2)Principal component analysis revealed that 16 evaluation indices of low-calcium tolerance coefficients were reduced to 5 principal components,with a cumulative contribution rate of 77.21%.Based on the analysis of the contribution rate and eigenvector of each principal component,it was found that full kernel mass ratio,kernel-fruit ratio,100-pod mass,and total pod number per plant are the core factors influencing yield formation,while oil content is the key trait determining the quality.(3)The results of cluster analysis and comprehensive evaluation indicated that the 170 peanut germplasm resources were divided to 5 categories by 16 indicators through cluster analysis,and 20 peanut germplasm resources with excellent comprehensive traits were screened out.According to the D value,the resources were classified into 5 grades,resulting in the selection of 12 peanut germplasm resources with better low-calcium tolerance.
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Basic Information:
DOI：10.14001/j.issn.1002-4093.2026.03.010
China Classification Code:S565.2
Citation Information:
[1]LIANG Qi,WU Gongming,GAO Sheng ,et al.Screening of Peanut Germplasms Tolerant to Low Calcium[J].Journal of Peanut Science().DOI:10.14001/j.issn.1002-4093.2026.03.010.
Fund Information:
国家重点研发计划（2024YFD2301000）; 岳麓山实验室种业专项（YLS-2025-ZY02038）; 国家现代农业产业技术体系（CARS-13）; 湖南省油料产业技术体系（HNYL-2）
2026-05-26
2026-05-26
2026-05-26