Establishment of <i>Coix lacryma-jobi</i> L. Core Germplasm Collection Based on Phenotypic Characters
Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2020, Vol. 41 ›› Issue (4): 669-675.DOI: 10.3969/j.issn.1000-2561.2020.04.006

• Crop Culture and Nutrition, Genetic Breeding • Previous Articles     Next Articles

Establishment of Coix lacryma-jobi L. Core Germplasm Collection Based on Phenotypic Characters

LI Xiushi,FU Yuhua(),ZHOU Xiang,LI Qing,LIU Fanzhi,YANG Chenglong,ZHOU Mingqiang   

  1. Guizhou Academy of Agricultural Sciences / Guizhou Institute of Subtropical Crops, Xingyi, Guizhou 562400, China
  • Received:2019-08-02 Revised:2019-08-13 Online:2020-04-25 Published:2020-05-09
  • Contact: FU Yuhua

Abstract:

A total of 248 accessions of Coix lacryma-jobi L. were grouped by geographical source and least distance stepwise sampling based on 14 phenotypic data. Eight candidate core collections were obtained according to a certain sampling proportion. The candidate core collections were then evaluated by the variable rate of coefficient of variation, mean difference percentage, coincidence rate of range, variance difference percentage, ratio of phenotypic retained, variance of phenotypic frequency and Shannon-Wiener diversity index. The primary core collections of C. lacryma-jobi L. contained 67 accessions with 27.02% of the original germplasm resources retained (25% sampling ratio within the group). The variable rate of coefficient of variation, mean difference percentage, coincidence rate of range, variance difference percentage, ratio of phenotypic retained, variance of phenotypic frequency and Shannon-Wiener diversity index was 110.05%, 0, 93.03%, 10%, 96%, 0.655, 0.881, respectively. Results of t-test showed that no significant difference was found in the mean of 14 phenotypic data between the primary core collections and original collections, with only three phenotypic traits lost some trait levels, 11 phenotypic traits retained all trait levels of the original collection (RPR=1.0), and the proportion of retained phenotypic data levels was 96.49%. The variation coefficient (CV) and Shannon-Wiener diversity index (I) of most traits were slightly higher than those of the original collection. It indicated that the core collection was of more representative and richer genetic diversity. The results laid an important foundation for the collection, protection and innovation of C. lacryma-jobi L. germplasm resources.

Key words: Coix lacryma-jobi L, germplasm resources, phenotypic characters, core collection

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