Genetic diversity and development of core collection in tobacco (Nicotiana tabacum L.) resources
Plant germplasm is an important gene resource for plant breeding and genetic improvement of traits. Core collection, as a representative subset of germplasm, provides an effective entry to investigate genetic diversity and screen potential breeding material. Most agronomic traits of tobacco often ex...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2014-07-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2014.04.091 |
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| Summary: | Plant germplasm is an important gene resource for plant breeding and genetic improvement of traits. Core collection, as a representative subset of germplasm, provides an effective entry to investigate genetic diversity and screen potential breeding material. Most agronomic traits of tobacco often exhibit strong genetic variation which can be decomposed into genotypic and genotype × environment interaction variations. A tobacco collection of 805 accessions were evaluated in two locations, Fuquan and Jinsha City of Guizhou Province, China. The genetic variations of 12 agronomic traits were analyzed and the genotypic values of each accession were predicted by a mixed linear model approach. Significant genotypic variations were detected for 11 traits, as well as genotype × environment interaction for 10 traits. Based on the predicted genotypic values, the combination strategies of sampling and clustering methods in the procedure of stepwise clustering for constructing core collection were screened in terms of magnitude of genetic variation captured by sampled subsets. Finally, the subset (S1C3_10), sampled by a centroid method combined with preferred sampling at 10% proportion, was determined to be a core collection of the tobacco germplasm. The representative and validation of the core collection was examined visually by the accession distribution pattern in the plot established by first two principal components, as well as by the correlation coefficients in terms of magnitude and significance between the core and the initial collections. The results showed that the initial collection was well represented by the core collection, and some potential breeding materials for high yield breeding program of tobacco, such as Y 177 and Y178, were included in the core collection. In sum, the constructed core collection will facilitate tobacco breeder to access to whole resources and promote the utilization of genetic diversity in future breeding program of tobacco in China. |
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| ISSN: | 1008-9209 2097-5155 |