INTROGRESSION OF GENES FROM ORYZA-OFFICINALIS WELL EX WATT TO CULTIVATED RICE, ORYZA-SATIVA L
INTROGRESSION OF GENES FROM ORYZA-OFFICINALIS WELL EX WATT TO CULTIVATED RICE, ORYZA-SATIVA L
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DOI：
10.1007/bf00224186
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发表时间：
1990-01-01
影响因子：
5.4
通讯作者：
KHUSH, GS
中科院分区：
文献类型：
--
作者：
JENA, KK;KHUSH, GS
栽培稻（Oryza sativa， AA）与远缘野生稻（O. officinalis， CC）进行了交回杂交。BC1后代多数为同种异体三倍体（AAC），少数为半三倍体。AAC后代再次回交到O. sativa。由二体或非整倍体个体组成的BC2后代检测了officinalis性状的存在。在这些子代中鉴定出11个不同的特征。后代的分离数据表明，这些性状本质上是单基因的。其中两个基因——抗白斑病基因和抗白斑病基因——在水稻改良中具有价值。重组后代极低的回收率与A和C基因组之间极低的配对量是一致的。由于这种限制性重组，仅在两次回交后即可重组回交亲本的基因型。因此，BC2的后代看起来与O. sativa非常相似。它们大多数都是稳定的、可育的，并且与其他玉米育种系也有干涉性。一些抗白僵菌病和白僵菌病的后代在产量上与最好的玉米亲本相当，并正在作为品种进行评估。
Sterile AC hybrids between cultivared Oryza sativa (AA) and a distant wild species, O. officinalis (CC), were backcross to O. sativa. Most of the BC1 progenies were allotriploid (AAC), a few were hypotriploid. AAC progenies were again backcrossed to O. sativa. BC2 progenies consisting of disomic or aneuploid individuals were examined for the presence of O. officinalis traits. Eleven different traits from O. officinalis were identified in these progenies. Segregation data in the subsequent generations suggest that these traits are monogenic in nature. Two of these genes - for resistance to BPH and WBPH - are of value in rice improvement. The extremely low recovery of recombinant progenies is in agreement with the very low amount of pairing between A and C genomes. Because of this restricted recombination, the genotype of the recurrent parent was reconstituted after two backcrosses only. Thus, the BC2 progenies look remarkably similar to O. sativa. Most of them are stable and fertile and also interfertile with other O. sativa breeding lines. Some of the BPH- and WBPH-resistant progenies are comparable in yield to the best O. sativa parents and are being evaluated as varietal possibilities.