共查询到20条相似文献,搜索用时 15 毫秒
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水稻基因组进化的研究进展 总被引:1,自引:0,他引:1
介绍了近年来在水稻基因组进化方面的研究进展,主要内容包括:水稻的核基因组至少经历了2次基因组复制过程,并从最初5条染色体形成了12条染色体;水稻籼粳两个亚种的分化估计发生在距今20~40万年前;在水稻驯化的研究方面,一方面克隆了一些控制重要驯化性状的基因,另一方面通过基因组分析发现了一些快速进化的基因组区段;片段复制、串联重复和逆转录转座等基因复制方式在水稻基因家族的物种特异性扩张方面起到了重要作用.通过整合以上研究成果,初步揭示了水稻基因进化的基本特点,为水稻功能基因组学和分子设计育种的进一步研究提供了新的切入点. 相似文献
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Ebert D 《Science (New York, N.Y.)》2011,331(6017):539-540
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Yu J Hu S Wang J Wong GK Li S Liu B Deng Y Dai L Zhou Y Zhang X Cao M Liu J Sun J Tang J Chen Y Huang X Lin W Ye C Tong W Cong L Geng J Han Y Li L Li W Hu G Huang X Li W Li J Liu Z Li L Liu J Qi Q Liu J Li L Li T Wang X Lu H Wu T Zhu M Ni P Han H Dong W Ren X Feng X Cui P Li X Wang H Xu X Zhai W Xu Z Zhang J He S Zhang J Xu J Zhang K Zheng X Dong J Zeng W Tao L Ye J Tan J Ren X Chen X He J Liu D Tian W Tian C Xia H Bao Q Li G Gao H Cao T Wang J Zhao W Li P Chen W Wang X Zhang Y Hu J Wang J 《Science (New York, N.Y.)》2002,296(5565):79-92
We have produced a draft sequence of the rice genome for the most widely cultivated subspecies in China, Oryza sativa L. ssp. indica, by whole-genome shotgun sequencing. The genome was 466 megabases in size, with an estimated 46,022 to 55,615 genes. Functional coverage in the assembled sequences was 92.0%. About 42.2% of the genome was in exact 20-nucleotide oligomer repeats, and most of the transposons were in the intergenic regions between genes. Although 80.6% of predicted Arabidopsis thaliana genes had a homolog in rice, only 49.4% of predicted rice genes had a homolog in A. thaliana. The large proportion of rice genes with no recognizable homologs is due to a gradient in the GC content of rice coding sequences. 相似文献
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Goff SA Ricke D Lan TH Presting G Wang R Dunn M Glazebrook J Sessions A Oeller P Varma H Hadley D Hutchison D Martin C Katagiri F Lange BM Moughamer T Xia Y Budworth P Zhong J Miguel T Paszkowski U Zhang S Colbert M Sun WL Chen L Cooper B Park S Wood TC Mao L Quail P Wing R Dean R Yu Y Zharkikh A Shen R Sahasrabudhe S Thomas A Cannings R Gutin A Pruss D Reid J Tavtigian S Mitchell J Eldredge G Scholl T Miller RM Bhatnagar S Adey N Rubano T Tusneem N Robinson R Feldhaus J Macalma T Oliphant A 《Science (New York, N.Y.)》2002,296(5565):92-100
The genome of the japonica subspecies of rice, an important cereal and model monocot, was sequenced and assembled by whole-genome shotgun sequencing. The assembled sequence covers 93% of the 420-megabase genome. Gene predictions on the assembled sequence suggest that the genome contains 32,000 to 50,000 genes. Homologs of 98% of the known maize, wheat, and barley proteins are found in rice. Synteny and gene homology between rice and the other cereal genomes are extensive, whereas synteny with Arabidopsis is limited. Assignment of candidate rice orthologs to Arabidopsis genes is possible in many cases. The rice genome sequence provides a foundation for the improvement of cereals, our most important crops. 相似文献
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Pennisi E 《Science (New York, N.Y.)》2000,288(5464):239-241
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重点介绍了在水稻基因组序列分析方面取得的几项最新研究结果.内容主要包括:水稻基因组被证实曾发生过全基因组倍增;水稻基因组大小变化的趋势;水稻籼粳亚种的分化时间比以前估计的100万年前要迟得多;对水稻基因产生GC含量负梯度现象的解释. 相似文献
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Service RF 《Science (New York, N.Y.)》2006,311(5767):1544-1546
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Roberts L 《Science (New York, N.Y.)》2001,291(5507):1182-1188