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首页> 外文期刊>The Kasetsart Journal >Composite Line Method for the Development of Early Generation Hybrids of Maize (Zea mays L.)
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Composite Line Method for the Development of Early Generation Hybrids of Maize (Zea mays L.)

机译：玉米早期杂交种发育的复合线法

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Six commercial single crosses were used for the improvement of composite and inbred lines. Modified S_1-full sib selection was applied to improve the three sister line composite. Lines were visually selected under low-competition environment in honeycomb arrangement with equilateral triangular side of 0.866 m. Testcross as well as diallel cross were applied to identify high combining lines. All yield trials were conducted in randomized completed block design with 4 replications, 1 row plot of 5 m long and 0.75 x 0.25 m plant spacing. Standard cultural practices were regulated and irrigation was applied as needed.rnStatistically, there was no clear advantage of yield between composite and inbred lines in early generation testcrosses. Besides, the diallel sets of both groups of lines gave similar results. However, the top hybrids of overall trials came from composite crosses even though it was not significant. In addition, composite lines were superior to S_3 lines in yield, earliness and plant height. Modified S_1-full sib selection is a flexible breeding method but its merit for the construction of early generation hybrids must be thoroughly investigated even though the positive results were observed.
机译：六个商业单交用于改良复合和自交系。修改后的S_1-完全同胞选择用于改善三姐妹线的组合。在低竞争环境下以蜂窝状布置以等边三角形边为0.866 m的目视选择线。使用Testcross和dialeel cross来识别高结合线。所有产量试验均在随机完整区组设计中进行，该试验有4个重复，5 m长的行图和0.75 x 0.25 m的植物间距。规范了常规的文化习俗，并根据需要进行了灌溉。rnn统计上，在早期的杂交试验中，复合系和自交系之间没有明显的产量优势。此外，两组线的Diallel集给出了相似的结果。但是，总体试验中表现最好的杂种来自复合杂交，尽管并不重要。此外，复合系在产量，早熟和株高方面均优于S_3系。改良的S_1-全同胞选择是一种灵活的育种方法，但是即使观察到了积极的结果，也必须彻底研究其在构建早期杂交种中的优点。

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