Screening of disease-resistant germplasm resources of Pinus massoniana and preliminary SNP analysis based on liquid chip

ZHU Jingyi, LIU Qinghua, ZHOU Zhichun, WANG Yangdong, LUO Dinghui

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2025, Vol. 49 ›› Issue (5) : 1-10.

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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2025, Vol. 49 ›› Issue (5) : 1-10. DOI: 10.12302/j.issn.1000-2006.202412002

Screening of disease-resistant germplasm resources of Pinus massoniana and preliminary SNP analysis based on liquid chip

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Abstract

【Objective】Pinus massoniana (masson pine), a native conifer species endemic to southern China’s mountainous regions, holds significant economic and ecological value. However, the spread of pine wood nematode disease (PWD) has necessitated breeding programs to enhance its resistance, and to provide critical germplasm for PWD-resistant breeding. 【Method】A total of 725 half-sib progenies (from 51 families) derived from PWD-resistant P. massoniana trees were collected across five provinces (cautonomous region). Resistance was assessed via artificial inoculation with 5 000 pine wood nematodes per seedling. Genome-wide association studies (GWAS) were performed by integrating phenotypic data from inoculation assays with targeted sequencing data generated using a 101.6 K liquid-phase probe panel. 【Result】Four highly resistant and ten resistant families were identified as valuable germplasm resources. Statistical analyses revealed that mixed linear model (MLM) obtained five significant SNPs (phenotypic variance explained, PVE 7.69%-11.24%). General linear model (GLM) obtained four significant SNPs (total PVE 5.96%). BLINK model obtained eleven significant SNPs (PVE 12.86%-26.43%). Nine candidate genes were functionally annotated, including P450 family proteins, pectin methylesterase inhibitors (PMEIs), and others. These genes likely regulate post-invasion immune responses by modulating cell wall structure and membrane protein recognition. 【Conclusion】Fourteen P. massoniana resistant families can serve as valuable breeding materials for disease-resistant varieties. Nine candidate disease-resistant genes identified through GWAS will contribute to elucidating the disease resistance mechanisms of P. massoniana and facilitating early selection of disease-resistant varieties.

Key words

masson pine(Pinus massoniana) / pine wilt disease (PWD) / genome-wide association study / resistance genes

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ZHU Jingyi , LIU Qinghua , ZHOU Zhichun , et al . Screening of disease-resistant germplasm resources of Pinus massoniana and preliminary SNP analysis based on liquid chip[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2025, 49(5): 1-10 https://doi.org/10.12302/j.issn.1000-2006.202412002

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