Rice,Panicle,Apical abortion,QTL,Genetic analysis,"/> Genetic Analysis of Rice Mutant L-05261 with Panicle Apical Abortion Trait
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Acta Agron Sin ›› 2011, Vol. 37 ›› Issue (11): 1935-1941.doi: 10.3724/SP.J.1006.2011.01935

• CROP GENETICS & BREEDING · GERMPLASM RESOURCES · MOLECULAR GENETICS • Previous Articles     Next Articles

Genetic Analysis of Rice Mutant L-05261 with Panicle Apical Abortion Trait

GAO Su-Wei,ZHANG Ling,MAO Bi-Gang,WANG Jiu-Lin,CHENG Zhi-Jun*,WAN Jian-Min   

  1. Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2011-03-04 Revised:2011-06-25 Online:2011-11-12 Published:2011-09-06
  • Contact: 程治军, E-mail: chengzj5rs@yahoo.com.cn

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Abstract: In rice, panicle apical abortion (PAA) has a detrimental effect on the final yield. Using one PAA mutant L-05261, we found that the occurrence of PAA is related to the excess accumulation of hydrogen peroxides (H2O2). The hybrid plants of four cross-combinations from two less PAA varieties of 9311, PA64, and two non-PAA varieties of Balilla and IRAT129 crossed to L-05261 showed PAA phenotypes, on their F2 populations, the percentages of PAA showed a continuous distribution and a bias towards non-PAA parents. The ratio of PAA plants and non-PAA plants in the L-05261×IRAT129 F2 fitted to 63:1, while the ratio in the BC1F1consisted of 7:1, corresponding to a genetic model involving three or more partial dominant genes. One hundred and eighty-two individuals from F2 of L-05261×IRAT129 were employed for QTL analysis, and four QTLs designated as qPAA3, qPAA4, qPAA5, and qPAA8 respectively, were detected out.However, no significantinteraction was found among these QTLs. Totally, all four QTLs were able to explain 46.32% of observed phenotypic variation. The remaining phenotypic variation was likely caused by environment effect, which should be considered in the following study.

Key words: font-family: "Times New Roman", mso-fareast-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, Rice')">mso-bidi-language: AR-SA">Rice, Panicle, Apical abortion, QTL, Genetic analysis

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