中国农业科学 ›› 2025, Vol. 58 ›› Issue (20): 4085-4099.doi: 10.3864/j.issn.0578-1752.2025.20.005

• 耐盐碱品种选育 • 上一篇    下一篇

玉米自然群体苗期耐盐性鉴定及耐盐相关基因分析

武书羽1(), 衡燕芳1,2(), 于太飞1(), 王世佳3, 于思佳3, 李园2, 胡正1, 张辉1, 孙现军1,3(), 黎亮1,2(), 姜奇彦1,4()   

  1. 1 中国农业科学院作物科学研究所/作物基因资源与育种全国重点实验室,北京 100081
    2 中国农业科学院作物科学研究所/作物分子育种国家工程研究中心,北京 100081
    3 中国农业科学院作物科学研究所/农业农村部粮食作物基因资源评价利用重点实验室,北京 100081
    4 国家盐碱地综合利用技术创新中心,山东东营 257347
  • 收稿日期:2025-07-16 接受日期:2025-09-23 出版日期:2025-10-16 发布日期:2025-10-14
  • 通信作者:
    姜奇彦,E-mail:
    黎亮,E-mail:
    孙现军,E-mail:
  • 联系方式: 武书羽,E-mail:vv01296@163.com。衡燕芳,E-mail:hengyanfang@caas.cn。于太飞,E-mail:yutaifei@caas.cn。武书羽、衡燕芳和于太飞为同等贡献作者。
  • 基金资助:
    中国农业科学院科技创新创新工程项目(CAAS ZDRW202201); 中国农业科学院科技创新创新工程项目(01-ICS-02); 中国农业科学院科技创新创新工程项目(Y2025YC08); 山东省重点研发计划(ZDYF2023LZGC001); 山东省重点研发计划(2024SFGC0404); 中央级公益性科研院所基本科研业务费专项(Y2025JC23); 江苏省现代作物生产协同创新中心和现代作物生产省部共建协同创新中心项目(CIC-MCP)

Identification of Salt Tolerance in Maize Natural Populations at the Seedling Stage and Analysis of Salt Tolerance-Associated Genes

WU ShuYu1(), HENG YanFang1,2(), YU TaiFei1(), WANG ShiJia3, YU SiJia3, LI Yuan2, HU Zheng1, ZHANG Hui1, SUN XianJun1,3(), LI Liang1,2(), JIANG QiYan1,4()   

  1. 1 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/State Key Laboratory of Crop Gene Resources and Breeding, Beijing 100081
    2 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/The National Engineering Center for Crop Molecular Breeding, Beijing 100081
    3 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/Key Laboratory of Grain Crop Genetic Resources Evaluation and Utilization, Ministry of Agriculture and Rural Affairs, Beijing 100081
    4 National Center of Technology Innovation for Comprehensive Utilization of Saline-Alkali Land, Dongying 257347, Shandong
  • Received:2025-07-16 Accepted:2025-09-23 Published:2025-10-16 Online:2025-10-14

摘要:

【目的】土壤盐渍化严重影响玉米生长发育,导致其产量下降。研究不同玉米自交系材料耐盐性,挖掘玉米耐盐相关优异等位变异,为玉米耐盐性遗传改良提供重要的SNP位点信息及候选基因资源。【方法】以包含238份自交系的自然群体为材料,对生长20 d的玉米自交系幼苗(三叶期)进行300 mmol·L-1 NaCl溶液处理,盐胁迫处理40 d后调查其生物量、水分含量和盐害表型。通过全基因组关联分析(genome-wide association study,GWAS)挖掘玉米耐盐相关优异等位变异。【结果】通过对该玉米自然群体苗期进行耐盐性鉴定,依据盐害率将材料划分为5个耐盐等级:高耐盐材料(1级)22份、耐盐材料(2级)93份、中耐材料(3级)62份、盐敏感材料(4级)41份、高敏感材料(5级)20份。不同耐盐等级材料份数呈正态分布特征,高耐与高敏材料合计占比17.6%,中间等级材料占比82.4%。经统计分析,盐害率与盐胁迫条件下植株的鲜重、干重、水分含量呈显著负相关性,各调查指标离散程度大,材料间差异显著。通过全基因组关联分析,共鉴定出40个与玉米耐盐性相关的SNP位点。进一步分析发现,在第1和第10染色体中各存在一个与玉米耐盐性显著相关的SNP位点,分析这两个位点上下游100 kb置信区间的候选基因,在该区间含有18个功能基因,其中有9个具有功能注释的功能基因和9个未知基因。【结论】从238份玉米自交系自然群体材料中鉴选获得高耐盐材料(1级)22份。挖掘出40个与玉米苗期耐盐性相关的SNP位点,筛选出2个与玉米苗期耐盐性显著相关的关键SNP位点,获得2个耐盐相关的候选基因ZmSTYK46和Zm00001eb004810,ZmSTYK46编码丝氨酸/苏氨酸蛋白激酶,Zm00001eb004810功能未知。

关键词: 玉米, 自交系, 耐盐性鉴定, 全基因组关联分析, 耐盐功能基因

Abstract:

【Objective】Soil salinization significantly impairs the growth and development of maize, resulting in reduced yields. Investigating the salt tolerance of various maize inbred lines and identifying favorable allelic variants associated with salt tolerance can provide valuable SNP markers and candidate gene resources for salt-tolerant maize varieties.【Method】This study utilized a natural population comprising 238 inbred maize lines as experimental materials. Twenty-day-old maize seedlings at the three-leaf stage were subjected to treatment with a 300 mmol·L-1 NaCl solution, and changes in biomass, moisture contents as well as salt damage phenotypes were evaluated after 40 days of salt stress. A genome-wide association study (GWAS) was subsequently performed to identify favorable allelic variants associated with salt tolerance in maize.【Result】Through salt tolerance assessment of a maize natural population at the seedling stage, the materials were categorized into five distinct salt tolerance grades based on the salt damage rate: 22 highly tolerant materials (Grade 1), 93 tolerant materials (Grade 2), 62 moderately tolerant materials (Grade 3), 41 salt-sensitive materials (Grade 4), and 20 highly sensitive materials (Grade 5). The number of materials with different salt tolerance levels shows a normal distribution characteristic, with high-tolerance and highly sensitive materials comprising 17.6% of the total, while intermediate-grade materials accounted for 82.4%. Statistical analysis revealed that the salt damage rate was significantly and negatively correlated with the fresh weight, dry weight, and moisture content of plants under salt stress. The investigated traits exhibited considerable variability, indicating substantial differences among the genotypes. Genome-wide association analysis identified a total of 40 SNP loci associated with maize salt tolerance. Further investigation revealed one significantly associated SNP locus on chromosome 1 and another on chromosome 10. Analysis of the candidate genes within the 100 Kb confidence interval upstream and downstream of these two loci identified a total of 18 functional genes, including 9 genes with functional annotations and 9 genes with unknown functions.【Conclusion】22 first-class salt-tolerant maize inbred line materials were selected from a natural population consisting of 238 lines. 40 SNP loci associated with salt tolerance in maize seedlings were identified, among which two key SNPs showed significant association with the trait. Two salt tolerance-related candidate genes, ZmSTYK46 and Zm00001eb004810, were identified. ZmSTYK46 encodes a serine/threonine protein kinase, while the function of Zm00001eb004810 remains unknown.

Key words: Zea mays L., inbred lines, salt tolerance identification, genome-wide association analysis, salt tolerance functional genes