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QTL mapping and QTL × environment interaction analysis of multi-seed pod in cultivated peanut(Arachis hypogaea L.)

The Crop Journal 2019年第2期7卷 249-260页

作者： Liang Wang Xinlei Yang Shunli Cui Guojun Mu Xingming Sun Lifeng Liu Zichao Li Key Lab of Crop Heterosis and Utilization Ministry of Education Beijing Key Lab of Crop Genetic Improvement China Agricultural University College of Agronomy Hebei Agricultural University North China Key Laboratory for Crop Germplasm Resources of Education Ministry Crop Research Institute Xinjiang Academy of Agricultural and Reclamation Science

To dissect the genetic mechanism of multi-seed pod in peanut, we explored the QTL/gene controlling multi-seed pod and analyzed the interaction effect of QTL and environment. Two hundred and forty eight recombinant inbred lines(RIL) from cross Silihong × Jinonghei 3 were used as experimental materials planted in 8 environments from 2012 to 2017. Three methods of analysis were performed. These included individual environment analysis, joint analysis in multiple environments, and epistatic interaction analysis for multi-seed pod QTL. Phenotypic data and best linear unbiased prediction(BLUP) value of the ratio of multi-seed pods per plant(RMSP) were used for QTL mapping. Seven QTL detected by the individual environmental mapping analysis and were distributed on linkage groups 1, 6, 9, 14, 19(2), and 21. Each QTL explained 4.42%–11.51% of the phenotypic variation in multi-seed pod, and synergistic alleles of5 QTL were from the Silihong parent. One QTL, explaining 4.93% of the phenotypic variation was detected using BLUP data, and this QTL mapped in the same interval as q RMSP19.1 detected in the individual environment analysis. Seventeen additive QTL were identified by joint analysis across multiple environments. A total of 43 epistatic QTL were detected by ICIM-EPI mapping in the multiple environment trials(MET) module, and involved 57 loci. Two main-effect QTL related to multi-seed pod in peanut were filtered. We also found that RMSP had a highly significant positive correlation with pod yield per plant(PY), and epistatic effects were much more important than additive effects. These results provide theoretical guidance for the genetic improvement of germplasm resources and further fine mapping of related genes in peanut.

关键词： Best linear unbiased prediction BLUP QTL × environment interaction Ratio of multi-seed pod RMSP

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Short Communication: Analysis of Grain Size Distribution through Image Analysis

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American Journal of Plant Sciences 2018年第12期9卷 2339-2346页

作者： Dennis C. Gitz III Jeffrey T. Baker Paxton Payton Zhanguo Xin Robert J. Lascano USDA-ARS Cropping Systems Research Laboratory Lubbock TX USA

Herein we describe an approach to measure the volume and to characterize the volume distribution of large numbers of individual small regularly shaped seeds. The results of a preliminary investigation into the distribution of seed size of a multi-seeded sorghum mutant, as compared to the wild type from which it was developed are also reported, and are used as an example of the method’s utility.

关键词： seed Size Grain Size Sorghum Twin seed multi-seed Image Analysis

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