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Study on heterosis of inter-subspecies between indica and japonica rice (Oryza sativa L.) using chromosome segment substitution lines

查看全文 作　　者：[1]YUChuanyuan;[3]ZHAIHuqu;[1]WANGChunming;[1]JIANGLing;[1]XIAOYinhui;[1]LIUYuqiang 高影响力作者 机构地区：[1]StateKeyLaboratoryofCropGeneticsandGermplasmEnhancement,NanjingAgriculturalUniversity;ResearchCenterofPlantGeneEngineeringofJiangsuPr.ovince,Nanjing210095,China;[3]CropScienceResearchInstitute,ChineseAcademyofAgriculturalSciences,Beijing100081,China高影响力机构 出　　处：《Chinese Science Bulletin》索引2005年第50卷第2期,共6页高影响力期刊 基　　金：This work was supported by the High Technology Research and Development Pro-gram of China(Grant Nos.2002AA207020 and 2001AA241024);the National Natural Science Foundation of China(Grant No.30370906). 摘　　要：Heterosis for yield and its component traits between chromosome segments from IR24, an indica variety, and the counterparts from 02428, a japonica rice, was inves- tigated by using a hybrid F1 population composed of 63 com- binations between 02428 and IR24 chromosome segment substitution lines (CSSLs) with the genetic background of Asominori, a japonica variety. Significant differences in het- erosis for yield and yield-component traits were observed among the crosses. Analysis of graphical genotyping showed that 14 substituted segments were responsible for yield het- erosis. All of them were from all the 12 chromosomes of IR24 except chromosomes 8 and 10. Six segments at the intervals of RFLP markers, such as X132—G1340—R459, X48— C393A, R288—R1854, R2918—X52, X257—C1350 and R367 —X189-2—X24-2 on chromosomes 2, 3, 4, 11 and 12 respec- tively, had very significant heterosis for yield at the level of P ≤0.005 based on t-test, individually increasing the hybrid yield by more than 35% compared with the control cross “Asominori×02428”. Most of IR24 chromosome segments were found to have no significant hybrid effect for yield and yield-component traits, and one segment located at R2171 on chromosome 6 possessed significant negative effect with 27% of yield decrease. Advantages of using CSSLs in the heterosis studies were discussed and approaches of the partial and genome-wide exploitation of rice heterosis between indica and japonica by molecular marker-assisted selection were then proposed. 关 键 词：杂种优势 间亚种 稻 染色体分割置换系统 杂种弱势 分子育种 基因工程
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