中国农业科学院烟草研究所
中国农业科学院科技创新工程(ASTIP-TRIC01);农作物种质资源保护与利用专项(2020NWB038);国家作物种质资源库(NCGRC-2020-18); 山东省自然科学基金(ZR2017BC022);中央级公益性科研院所基本科研业务费专项(1610232019008)
Institute of Tobacco Research of CAAS
为了提高野生烟种质资源的开发利用效率,本研究利用表型性状和SSR 分子标记技术对30 份野生烟种质资源进行了遗传多样性分析。结果表明,30 份种质资源表型性状具有丰富的变异类型,遗传多样性指数(H')的变幅为0.831~1.955,其中节距的多样性指数最高,叶长和叶宽次之。16 对SSR 引物共检测到98 个等位基因,平均为6.125,Shannon 信息指数(I)、期望杂合度(He)、观测杂合度(Ho)、多态信息含量(PIC)的均值分别为1.5425、0.7596、0.2404、0.8668。聚类分析和群体结构分析显示供试材料可分为4 个类群,分类结果大致相同,各类群聚集的地域性规律较明显。利用这16 对引物构建了30 个野生烟种质的指纹图谱,为野生烟种质资源鉴定体系的研究奠定理论基础。抗病性鉴定发现,N. exigua 等7 份种质表现为抗病;N. nesophila 高抗青枯病,N. debneyi 和N. stocktonii 抗青枯病;N. alata 等5 份种质对TMV 免疫;N. alata 等9 份种质抗CMV;N. debneyi 等15 份种质抗PVY。本研究可为野生烟种质资源的鉴定评价、种质创新和优异基因发掘奠定基础。
In order to improve the exploration and utilization efficiency of wild tobacco germplasm resource, the genetic diversity of 30 wild tobacco accessions was accessed by phenotypic variations and SSR molecular markers. The results revealed abundant phenotypic variations at each of traits, with the genetic diversity index of 0.831 to 1.955. Among them, the diversity index of node distance was the highest, followed by leaf length and width. The marker analysis using 30 pairs of SSR primers detected 98 alleles with an average of 6.125. The mean value of Shannon information index (I), expected heterozygosity (He), observed heterozygosity (Ho) and Polymorphic information content (PIC) were 1.5425, 0.7596, 0.2404 and 0.8668, respectively. The cluster analysis and population structure analysis roughly suggested four groups, likely coincidence with the geographical collection sites. Sixteen SSR markers were used to construct the fingerprints of 30 wild tobacco accessions, which laid a theoretical foundation for the research on the identification system of wild tobacco accessions. Moreover, tests for disease resistance suggested seven accessions including N.exigua were resistant to black shank disease. The species N. nesophila were highly resistance to bacterial wilt, while N. debneyi and N.stocktonii were resistant. Five accessions including N. alata were immune to TMV. Nine accessions including N.alata were resistant to CMV, and 15 accessions including N. debneyi were resistant to PVY. This study established foundation for the identification and evaluation, germplasm resources innovation and explored excellent gene of wild tobacco resources.
刘国祥,李媛,王俊,等.野生烟种质资源的遗传多样性分析及抗病性鉴定[J].植物遗传资源学报,2020,21(6):1549-1560.
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