Development of New Submergence Tolerant Rice Variety for Bangladesh Using Marker-Assisted Backcrossing
Development of New Submergence Tolerant Rice Variety for Bangladesh Using Marker-Assisted Backcrossing
复制标题
DOI：
10.1016/j.rsci.2015.05.003
复制
发表时间：
2015-01-01
期刊：
影响因子：
4.8
通讯作者：
Ali, Md Shamsher
中科院分区：
文献类型：
--
作者：
Iftekharuddaula, Khandakar Md;Ahmed, Helal Uddin;Ali, Md Shamsher
以BR 11为受体亲本，采用前景选择、表型选择和背景选择相结合的方法，选育出耐淹高产水稻新品种。发现重组选择对于通过BC 2F 2代使连锁阻力最小化至关重要。在没有重组选择的情况下，回交重组系（BRL）中的渐渗大小在载体染色体上约为15 Mb。在孟加拉国水稻研究所进行的2周淹水胁迫下，BRL表现出较对照品种的耐淹性，并在控制淹水条件下比同基因Sub1系获得了更高的产量。2010年，BRL IR 85260 -66-654-Gaz 2作为BRRI dhan 52发布，这是孟加拉国第一个高产耐淹品种。BRRI dhan 52在孟加拉国不同山洪易发地区连续三个季节的产量为4.2 - 5.2 t/hm（2）。研究表明，重组选择的效率和更好的适应性，新发布的耐淹高产品种在该国不同地区的山洪灾害易发区的耐淹性和产量潜力。
Submergence tolerant high yielding rice variety was developed using BR11 as a recipient parent applying foreground, phenotypic and background selection approaches. Recombinant selection was found essential to minimize linkage drag by BC2F2 generation. Without recombinant selection, the introgression size in the backcross recombinant lines (BRLs) was approximately 15 Mb on the carrier chromosome. The BRLs were found submergence tolerance compared to the check varieties under complete submergence for two weeks at Bangladesh Rice Research Institute, and produced higher yield compared to the isogenic Sub1-line under controlled submerged condition. The BRL IR85260-66-654-Gaz2 was released as BRRI dhan52 in 2010, which was the first high yielding submergence tolerant variety in Bangladesh. BRRI dhan52 produced grain yield ranging from 4.2 to 5.2 t/hm(2) under different flash flood prone areas of Bangladesh in three consecutive seasons. The study demonstrated the efficiency of recombinant selection and better adaptability of the newly released submergence tolerant high yielding variety in flash flood prone different areas of the country with respect to submergence tolerance and yield potential.