Authors: Wen Gui Yan Yong Li Hesham A Agrama Dagang Luo Fangyuan Gao Xianjun Lu Guangjun Ren
Publish Date: 2009/05/26
Volume: 24, Issue: 3, Pages: 277-292
Abstract
Stigma and spikelet characteristics play an essential role in hybrid seed production A minicore of 90 accessions developed from USDA rice core collection was phenotyped in field grown for nine traits of stigma and spikelet and genotyped with 109 DNA markers 108 SSRs plus an indel Three major clusters were built upon Rogers’ genetic distance indicative of indicas and temperate and tropical japonicas A mixed linear model combining PCmatrix and Kmatrix was adapted for mapping markertrait associations Resulting associations were adjusted using false discovery rate technique We identified 34 markertrait associations involving 22 SSR markers for eight traits Four markers were associated with single stigma exsertion SStgE six with dual exsertion DStgE and five with total exsertion RM5 Chr1 played major role indicative of high regression with not only DStgE but also SStgE Four markers were associated with spikelet length three with width and seven with L/W ratio Numerous markers were coassociated with multiple traits that were phenotypically correlated ie RM12521 Chr2 associated with all three correlated spikelet traits The coassociation should improve breeding efficiency because single marker could be used to assist breeding for multiple traits Indica entry 1032 cultivar 50638 and japonica entry 671 cultivar Linia 84 Icar with 8065 and 7517 of TStgE respectively are recommended to breeder for improving stigma exsertion
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