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Development of the core collection through advanced maximization strategy with heuristic approach in cashew (Anacardium occidentale L.)

Published online by Cambridge University Press:  06 March 2018

G. S. Mohana  and
M. G. Nayak
G. S. Mohana*
Affiliation:
ICAR-Directorate of Cashew Research, Puttur, Dakshina Kannada district, Karnataka State, India
M. G. Nayak
Affiliation:
ICAR-Directorate of Cashew Research, Puttur, Dakshina Kannada district, Karnataka State, India
*
*Corresponding author. E-mail: [email protected]
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Abstract

ICAR-Directorate of Cashew Research is the nodal agency for conducting cashew research and manages the largest field gene bank in India. Cashew is a perennial tree and needs more land and other resources to maintain accessions. Conservation through seeds is not feasible because of cross-pollination. Tissue culture efforts to regenerate plants from mature explants are not successful. Therefore, efficient management of the filed gene bank particularly utilization requires designation of the core collection representing the spectrum of diversity present in the entire collection. In this study, a relatively new technique, the advanced M strategy with heuristic approach was deployed to develop the core collection. Sixty-eight morphometric characters of 478 accessions were subjected to analysis resulting in the core collection of 49 accessions. Further, another core collection of same number was constituted by K-Means clustering to compare the efficiency of two approaches. The validation parameters like mean difference, variance difference, coincidence rate, variable rate and class coverage among others were employed for comparative analysis. The results of these parameters revealed that the core collection designated by heuristic approach was better able to efficiently represent and retain the diversity of the entire collection compared with the core identified by clustering approach. Future conservation and breeding efforts will be focused on establishing a separate block in the field gene bank having 49 accessions of cashew core collection.

Keywords

cashewcore collectiongermplasmheuristic approach
Type
Research Article
Information
Plant Genetic Resources , Volume 16 , Issue 4 , August 2018 , pp. 367 - 377
Copyright
Copyright © NIAB 2018 

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