棉花早熟性状的相关性分析和QTL定位  

Correlation of Early Maturing Traits and QTL Mapping in Cotton

作　　者：李轲[1] 李志博[1] 魏亦农[1] 

机构地区：[1]石河子大学/新疆兵团绿洲生态农业重点实验室,新疆石河子832000

出　　处：《新疆农业科学》2010年第1期78-81,共4页Xinjiang Agricultural Sciences

基　　金：国家自然科学基金项目(30760124)

摘　　要：【目的】提高短季棉生产力，协调早熟与高产优质的矛盾。【方法】利用陆地棉晋13和海岛棉海7124杂交的F2群体，分析现蕾天数、开花天数、吐絮天数等生育期性状和株高、果枝始节等农艺性状之间的相关性并对相关性状QTL分析。【结果】现蕾、开花、现铃与吐絮呈极显著正相关，各生育期与株高呈显著或极显著负相关，与果枝始节相关不显著，用复合区间作图法检测到18个QTL.控制吐絮的QTL检测到4个，在染色休C2、C22、C25和D3上，可解释表型变异的69．6％～89．9％；在染色体C2、C25和D3上的相同位置还检测到现蕾-吐絮，开花-吐絮的QTL4个；在染色体C9和C17上检测到控制现蕾的QTL各1个；在染色体C15和C26上检测到控制开花QTL各1个，在相同位置还检测到控制现铃的QTL；在染色体A3上发现了控制株高和果枝始节的QTL各1个。【结论】这些QTL的发现为棉花早熟育种提供了依据。[Objective and Method]The correlation betewwn growth periods（ the days of budding, flowering, opening boll） and agtieultural traits（plant height and first fruiting branch node） were analyzed in a F2 population, which was derived from a cross between Ghirsutum L. ＂Jin13＂ and Gbarbadense L. ＂Hai7124＂. And QTLs detection of these traits were employed in this population. [Result]The conclusion showed that the day of opening boll was positively correlated with the day of budding, flowering, boll setting, but negatively correlated with plant height, and no significant correlation with first fruiting branch node. A total of 18 QTLs were detected by composite interval mapping, including 4 QTLs for opening boll on chromosome 2, 22, 25 and D3. The variances explained by each QTL from 69.6% to 89.9%. The QTLs for budding to opening boll and flwering to opening boll were detected in the same area of chromosome 2, 25 and D3. 2 QTLs for budding were separately detected on chromosome 9 and 17. 2 QTLs for flowering were separately detected on chromosome 15 and 26, and 2 QTLs for bud setting were detected in seune area of these chromosomes. The QTL for plant height and first fruiting branch node were detected in stone area of chromosome A3. [ Conclusion ] These QTLs have provided evidence for early maturing cotton breeding .

关 键 词：棉花 早熟 株高 相关性分析 QTL 

分 类 号：S562[农业科学—作物学] S188