武汉市农业科学院蔬菜研究所,武汉 430207
研究方向为水生蔬菜种质资源与育种利用,E-mail: watc1989@163.com
朱红莲,研究方向为水生蔬菜种质资源与育种利用,E-mail: zhuhonglian2014@163.com
国家现代农业产业技术体系(CARS-24);国家园艺种质资源库(NHGRC)
Institute of Vegetables, Wuhan Academy of Agricultural Sciences, Wuhan 430207
Foundation projects: National Modern Agricultural Industry Technology System (CARS-24); National Horticultural Germplasm Resource Center (NHGRC)
芋[Colocasia esculenta (L.) Schott]是世界第五大根茎类作物,其种质资源以地方品种为主。由于不同地区间引种频繁,以及长期依赖球茎进行无性繁殖,芋品种类型多且存在大量表型相似的材料,仅依赖表型性状鉴定已难以满足准确鉴别和高效管理的需求。为提升芋种质资源管理的精准度与数字化水平,基于前期重测序数据开发了覆盖全基因组的695对特异性引物。利用该引物体系对193份芋种质资源进行靶向测序,共检测到2317个高可信度SNP位点。基于遗传聚类分析,193份种质被清晰地划分为6个类群。计算样品间SNP差异位点所反映的遗传相似度,结果显示79.57%的样品对的遗传相似度集中在0.45~0.65区间;同时发现8对样品的遗传相似度高达0.98以上,可能为同物异名或遗传背景高度相近的材料。此外,还进一步筛选出17个核心SNP位点,构建了芋种质资源的分子指纹图谱,并结合其地理来源和品种类型信息,建立了每份材料唯一的分子身份证。本研究建立的方法体系为芋种质资源的精准区分、鉴定及基因型数据的数字化管理提供了有力的技术支撑,对种质资源的保护和高效利用具有重要的理论意义和应用价值。
Taro [Colocasia esculenta (L.) Schott] ranks as the fifth most important cultivated tuber crop worldwide. Its germplasm resources consist predominantly of local landraces, which are frequently exchanged across regions and primarily propagated through clonal reproduction via cormels. These practices have resulted in high degree of genetic diversity coupled with often minimal morphological differentiation. Accurate identification and efficient management using conventional phenotypic descriptors alone remain challenging. To improve the precision and efficiency of germplasm management, we developed a molecular system based on genome-wide SNP markers. Based on previous resequencing data, we designed 695 primer pairs covering the entire genome for targeted resequencing. Using the primer set, 2317 high-confidence SNPs were identified across 193 taro germplasm accessions. Genetic clustering analysis grouped the accessions into six distinct clusters. Pairwise comparisons of SNP differences revealed that 79.57% of accession pairs exhibited genetic similarity values between 0.45 and 0.65, whereas eight pairs exhibited very high similarity (0.98), suggesting the presence of putative duplicates or materials with highly similar genetic backgrounds. Furthermore, a core set of 17 informative SNP markers was selected to generate molecular fingerprints for all 193 accessions. These fingerprints, integrated with geographical origin and varietal type, were used to create unique molecular IDs for each accession. This study provides a robust and efficient approach for the accurate discrimination, precise identification, and digital management of taro germplasm, offering significant theoretical insights and practical applications for its conservation and utilization.
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