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| 1 | Fine Mapping of qPAA8,a Gene Controlling Panicle Apical Development in Rice显示文摘In rice,one detrimental factor influencing single panicle yield is the frequent occurrence of panicle apical abortion(PAA) under unfavorable climatic conditions.Until now,no detailed genetic information has been available to avoid PAA in rice breeding.Here,we show that the occurrence of PAA is associated with the accumulation of excess hydrogen peroxide.Quantitative trait loci(QTLs) mapping for PAA in an F2 population derived from the cross of L-05261(PAA line) × IRAT129(non-PAA variety) identified seven QTLs over a logarithm of the odd(LOD) threshold of 2.5,explaining approximately 50.1% of phenotypic variance for PAA in total.Five of the QTLs with an increased effect from L-05261,were designated as qPAA3-1,qPAA3-2,qPAA4,qPAA5 and qPAA8,and accounted for 6.8%,5.9%,4.2%,13.0% and 12.2% of phenotypic variance,respectively.We found that the PAA in the early heading plants was mainly controlled by qPAA8.Subsequently,using the sub-populations specific for qPAA8 based on markerassisted selection,we further narrowed qPAA8 to a 37.6-kb interval delimited by markers RM22475 and 8-In112.These results are beneficial for PAA gene clone. | Zhi-Jun Cheng Bi-Gang Mao Su-Wei Gao Ling Zhang Jiu-Lin Wang Cai-Lin Lei Xin Zhang Fu-Qing Wu Xiu-Ping Guo Jianmin Wan | 2011 | Journal of Integrative Plant Biology2011，53，9： | 10 |
| 2 | 小麦穗顶部和基部小穗结实粒数的全基因组关联分析显示文摘为挖掘与小麦穗顶部和基部结实粒数性状相关的标记位点及优异等位变异,利用106对有多态性的SSR标记,与4个环境下的穗顶部和基部小穗结实粒数进行全基因组关联分析。结果表明,共关联到27对SSR标记,28个显著关联位点,表型解释率在5.73%~30.73%,其中,Xgwm55(6D)、Xgwm95(2A)、Xgwm102(2D)和Xgwm285(3B)分别在4、2、2、2个环境下与小麦穗顶部或基部小穗结实粒数相关联,为稳定的一因多效标记位点;发现优异等位变异位Xgwm132-6B_(128)和Xgwm102-2D_(142)可分别增加穗顶部小穗结实粒数0.14、0.20粒,Xgwm5-3A_(168)、Xgwm161-3D_(153)以及Xcfe172-3D_(144)可分别增加基部小穗结实粒数0.17、0.29、0.34粒。研究结果对于利用标记辅助选择、增加小麦穗粒数、进而提高小麦产量具有重要参考价值。 | 马婕龙 张政 史雨刚 曹亚萍 孙黛珍 王曙光 | 2021 | 山西农业科学2021，49，4： | 0 |
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