现代水稻品种的干旱敏感性：耐旱性与不良性状连锁的影响。
Drought susceptibility of modern rice varieties: an effect of linkage of drought tolerance with undesirable traits.
作者信息
Vikram Prashant, Swamy B P Mallikarjuna, Dixit Shalabh, Singh Renu, Singh Bikram P, Miro Berta, Kohli Ajay, Henry Amelia, Singh N K, Kumar Arvind
机构信息
Plant Breeding, Genetics, and Biotechnology Division, International Rice Research Institute, Los Baños, Philippines.
National Research Center for Plant Biology, Indian Agricultural Research Institute, New Delhi, India 110012.
出版信息
Sci Rep. 2015 Oct 13;5:14799. doi: 10.1038/srep14799.
Green Revolution (GR) rice varieties are high yielding but typically drought sensitive. This is partly due to the tight linkage between the loci governing plant height and drought tolerance. This linkage is illustrated here through characterization of qDTY1.1, a QTL for grain yield under drought that co-segregates with the GR gene sd1 for semi-dwarf plant height. We report that the loss of the qDTY1.1 allele during the GR was due to its tight linkage in repulsion with the sd1 allele. Other drought-yield QTLs (qDTY) also showed tight linkage with traits rejected in GR varieties. Genetic diversity analysis for 11 different qDTY regions grouped GR varieties separately from traditional drought-tolerant varieties, and showed lower frequency of drought tolerance alleles. The increased understanding and breaking of the linkage between drought tolerance and undesirable traits has led to the development of high-yielding drought-tolerant dwarf lines with positive qDTY alleles and provides new hope for extending the benefits of the GR to drought-prone rice-growing regions.
绿色革命（GR）水稻品种产量高，但通常对干旱敏感。部分原因是控制株高和耐旱性的基因座之间存在紧密连锁。本文通过对qDTY1.1的特征分析来说明这种连锁关系，qDTY1.1是一个干旱条件下产量的数量性状基因座，与控制半矮秆株高的GR基因sd1共分离。我们报告称，绿色革命期间qDTY1.1等位基因的丢失是由于它与sd1等位基因紧密连锁且呈排斥关系。其他干旱产量数量性状基因座（qDTY）也与绿色革命品种中被摒弃的性状紧密连锁。对11个不同qDTY区域的遗传多样性分析将绿色革命品种与传统耐旱品种分开聚类，并显示耐旱等位基因的频率较低。对耐旱性与不良性状之间连锁关系的深入理解和打破，已促成了具有正向qDTY等位基因的高产耐旱矮秆品系的培育，并为将绿色革命的益处扩展到易旱水稻种植区带来了新希望。
Zotero 插件