PMID: 19706531 棣欑背 杩涘寲
Proc Natl Acad Sci 2009 Aug 25;106(34):14444-9
The origin and evolution of fragrance in rice (Oryza sativa L.). [涓嬭浇]
Thanks to kunshanyu锛鍏充簬杩欎釜鏂囩尞闆嗘潫(鐚涘嚮鎴)涓竴绡囨枃绔犵殑璇︾粏銆
杩欑瘒鏂囩珷鏄浗闄呮按绋绘墍鍜屽悍濂堝皵鐨勪竴涓ぇ鐗汼usan R. McCouch鍙戠殑锛屾嵁璇碨usan R. McCouch浠ュ墠鏄鏂囧鐨勶紝鎵浠ュス鐨勬枃绔犲啓寰楅兘寰堥閫革紝鍛靛懙銆備粬浠氳繃瀵归鍛虫湁鍏崇殑涓涓富瑕佸熀鍥燽etaine aldehyde dehydrogenase gene (BADH2)鐨8涓笉鍚宎lleles鐨勮繘鍖栧垎鏋愶紝鍙戠幇棣欏懗鍩哄洜鏈鏃╁嚭鐜颁簬绮崇ɑ锛岃繖涓鐐瑰ぇ澶ф寫鎴樹簡浠ュ墠棣欑背浠庣奔绋昏捣婧愮殑鍋囪锛屽叿浣撳唴瀹硅鏂囩珷銆傞檮涓奻aculty1000鐨勮瘎璁哄涓嬶細
This study shows that fragrance of rice grains is controlled by at least eight independent mutations in the betaine aldehyde dehydrogenase (BADH2) enzyme-encoding locus. While most of these mutations are confined to narrow geographic regions, one mutation rose to high frequency in Japonica rice, and introgressed into Indica varieties.
A 5.3-Mb region flanking the BADH2 gene is found in Basmati-like accessions, with strong similarity to the ancestral Japonica haplotype, providing evidence for this Japonica to Indica introgression. These results contrast with earlier suggestions that fragrant rice originated in Indica rice. Reduced nucleotide diversity and elevated linkage disequilibrium suggest strong positive selection acting on this causal allele.