Development of early maturing submergence-tolerant rice varieties for Bangladesh
Development of early maturing submergence-tolerant rice varieties for Bangladesh
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DOI：
10.1016/j.fcr.2015.12.001
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发表时间：
2016-04-01
影响因子：
5.8
通讯作者：
Septiningsih, Endang M.
中科院分区：
文献类型：
--
作者：
Iftekharuddaula, Rhandakar M.;Ahmed, Helal U.;Septiningsih, Endang M.
山洪暴发对全球水稻生产造成不利影响。由于复种的需要，以及为了避免后季的寒冷和疾病的发生，一些水稻产区迫切需要早熟耐淹品种。利用分子标记辅助回交（MABC）技术将来自BRRI dhan 52的耐淹QTL SUB1基因导入短日照水稻品种BRRI dhan 33。在该特定研究中，在BC 1F 1-BC 4F 1阶段期间进行前景和表型选择的组合，而在BC 4F 2阶段使用整组前景、重组和背景标记。在最后阶段，15个BC 4F 3有希望的系中受体亲本基因组的回收率在90.7%至95.2%之间。不同Sub1系的渐渗大小估计为约2.4至5.6 Mb。BR 9157 -12-2-37-13-15-40系耐淹性最好，存活率为87.7%。Sub1系的籽粒产量也显着高于原始品种，BRRI dhan 33，在淹水和非淹水条件下，在站和农场试验。从BRRI dhan 33-Sub1系获得的最大谷物产量在农场非淹水条件下为4.8 t/ha，在农场淹水条件下为3.8 t/ha。最佳选择的Sub1系可能在未来作为孟加拉国洪水易发地区的短期耐淹高产品种发布。(C)2015爱思唯尔B. V.保留所有权利。
Flash flooding imparts adverse effect on rice production worldwide. Because of the needs for multiple cropping and to avoid incidences of cold and diseases later in the season, early maturing submergence tolerant varieties have been urgently needed in some rice producing areas. Marker-assisted backcrossing (MABC) was used to introgress the submergence-tolerance SUB1 QTL from BRRI dhan52 into a short duration rice variety, BRRI dhan33. In this particular study, a combination of foreground and phenotypic selection was performed during the BC1F1-BC4F1 stages, while the whole set of foreground, recombinant and background markers were used at the BC4F2 stage. At the final stage, the recovery of recipient parent genome ranged from 90.7 to 95.2% in 15 BC4F3 promising lines. The introgression sizes of the different Sub1 lines were estimated to be around 2.4 to 5.6 Mb. The submergence tolerance of line BR9157-12-2-37-13-15-40 was found to be the best, having 87.7% survival. The grain yield of the Sub1 lines was also significantly higher compared with that of the original variety, BRRI dhan33, under both flooded and non-flooded conditions in on-station and on-farm trials. The maximum grain yield obtained from a BRRI dhan33-Sub1 line was 4.8 t/ha under on-farm non-flooded conditions and 3.8 t/ha under on farm flooded conditions. The best selected Sub1 line may be released in the future as a short-duration, submergence-tolerant high-yielding variety for flood-prone rainfed areas in Bangladesh. (C) 2015 Elsevier B.V. All rights reserved.