Simultaneous improvement in cold tolerance and yield of temperate japonica rice (Oryza sativa L.) by introgression breeding
Simultaneous improvement in cold tolerance and yield of temperate japonica rice (Oryza sativa L.) by introgression breeding
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DOI：
10.1111/pbr.12097
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发表时间：
2013-12-01
期刊：
影响因子：
2
通讯作者：
Li, Zhikang
中科院分区：
文献类型：
--
作者：
Meng, Lijun;Lin, Xiuyun;Li, Zhikang
为了使粳稻品种超优1号（CY1）的高产与耐冷性相结合，从11个CY1 BC2F4群体中筛选出324个BC2F5渐渗系，进行了生殖期和苗期耐冷性测定。本研究中CT的平均实现遗传度为0.747。在压力和正常条件下的重复实验中，对来自5个BC群体的116个IL进行评估，确定了18个有希望的IL，与CY1相比，它们大大提高了CT和产量。在胁迫和非胁迫条件下，对CT和产量相关性状的IL和CY1之间的详细比较提供了有用的信息，并更好地理解BC育种过程中的重要问题，如供体选择，选择效率和非目标性状的相关变化。大量的CT IL的开发提供了有用的材料，遗传，生理和分子解剖CT和产量性状的DNA标记和组学工具，并作为亲本，进一步改善这些性状的QTL设计的嵌合。
To combine high yield and improved cold tolerance (CT) in a japonica rice variety, Chaoyou1' (CY1), 324 BC2F5 introgression lines (ILs) selected for CT from 11 CY1 BC2F4 populations were evaluated in replicated experiments for their CT at the reproductive and seedling stages. A mean realized heritability of 0.747 was achieved in this study for CT. Evaluation of 116 ILs from five BC populations in replicated experiments under stress and normal conditions identified 18 promising ILs that had greatly improved CT and yield compared with CY1. Detailed comparisons between the ILs and CY1 for CT and yield-related traits under stress and non-stress conditions provided useful information and better understanding of important issues such as donor selection, selection efficiency and associated changes in non-target traits in the BC breeding process. The large numbers of CT ILs developed provide useful materials for genetic, physiological and molecular dissection of CT and yield traits using DNA markers and -omic tools, and as parents for further improving these traits by designed QTL pyramiding.