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United States Department of Agriculture

Agricultural Research Service

Research Project: GENETIC AND GENOMIC APPROACHES TO IMPROVE PEANUT AND CORN RESISTANCE TO DISEASE AND AFLATOXIN CONTAMINATION

Location: Crop Protection and Management Research

Title: Phenotypic evaluation of the Chinese mini-mini core collection of peanut (Arachis hypogaea L.) and assessment for resistance to bacterial wilt disease caused by Ralstonia solanacearum

Authors
item Jiang, Huifang -
item Ren, Xiaoping -
item Chen, Yuning -
item Huang, Li -
item Zhou, Xiaojing -
item Huang, Jiaquan -
item Froenicke, Lutz -
item YU, JIUJIANG
item GUO, BAOZHU
item Liao, Boshou -

Submitted to: Plant Genetic Resources
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: October 29, 2012
Publication Date: March 11, 2013
Citation: Jiang, H., Ren, X., Chen, Y., Huang, L., Zhou, X., Huang, J., Froenicke, L., Yu, J., Guo, B., Liao, B. 2013. Phenotypic evaluation of the Chinese mini-mini core collection of peanut (Arachis hypogaea L.) and assessment for resistance to bacterial wilt disease caused by Ralstonia solanacearum. Plant Genetic Resources: Characterization and Utilization. 11(1):77-83.

Interpretive Summary: Peanut is an important oil crop in many developing countries. Remarkable progress has been achieved in peanut genetic improvement. In order to utilize the peanut collection more efficiently, the core collection and mini core collection concepts were developed to capture the genetic diversity and variation of the entire collection by studying in an even smaller number of accessions. The objective of this study was to develop a mini-mini core collection for capturing the variations in the core and the entire collection for efficient evaluation and characterization of the most useful agronomic and disease resistant traits. For this reason, a mini-mini core collection with 99 accessions from the core accessions was developed based on the analysis of 21 morphological traits. It was demonstrated that there were no significant differences between the core and the mini-mini core collections in 20 out of the 21 morphological traits studied. The newly developed mini-mini core collection was assessed for resistance to bacterial wilt disease caused by Ralstonia solanacearum. Two accessions showing high level of resistance to bacterial wilt were identified demonstrating the usefulness of the mini-mini core collection, which will be re-sequenced as part of International Peanut Genome Consortium sequencing project at the UC-Davis Genome Center.

Technical Abstract: In order to utilize the germplasm more efficiently for peanut (Arachis hypogaea L.) genetic improvement, a core collection of 576 accessions and a primary mini core collection of 298 accessions was developed previously from a collection of 6,839 cultivated peanut lines stored at the Oil Crops Research Institute of Chinese Academy of Agricultural Sciences at Wuhan. For efficient evaluation and characterization of the most useful agronomic and disease resistant traits an even smaller collection of peanut accessions that represent a spectrum of phenotypes could be more desirable. For this reason, a mini-mini core collection with 99 accessions from the core accessions was developed based on the analysis of 21 morphological traits. It was demonstrated that there were no significant differences between the core and the mini-mini core collections in 20 out of the 21 morphological traits studied. Further, the mini-mini core collection captured the ranges of all of the 21 traits displayed in the core collection. The newly developed mini-mini core collection was assessed for resistance to bacterial wilt disease caused by Ralstonia solanacearum. Two accessions showing high level of resistance to bacterial wilt were identified demonstrating the usefulness of the mini-mini core collection. The mini-mini-core collection provides more efficient means of germplasm evaluation and will be re-sequenced as part of International Peanut Genome Consortium sequencing project at the UC-Davis Genome Center.

Last Modified: 7/28/2014
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