Molecular Evolution of the Non-symbiotic Hemoglobin Gene Family in Oryza rufipogon and Oryza nivara
碩士 === 國立成功大學 === 生物學系碩博士班 === 93 === Rice, one of the most important crops, provide a half of world populations with a staple food. In plants, hemoglobin genes have long been considered to exist only in nitrogen-fixing nodules. Non-symbiotic hemoglobins that express in nonnodulating species were e...
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ndltd-TW-093NCKU51120012017-06-02T04:42:04Z http://ndltd.ncl.edu.tw/handle/63754790584242448915 Molecular Evolution of the Non-symbiotic Hemoglobin Gene Family in Oryza rufipogon and Oryza nivara 野生水稻之非共生性輸氧蛋白基因家族的分子演化研究 Hsiu-Hui Pan 潘秀惠 碩士 國立成功大學 生物學系碩博士班 93 Rice, one of the most important crops, provide a half of world populations with a staple food. In plants, hemoglobin genes have long been considered to exist only in nitrogen-fixing nodules. Non-symbiotic hemoglobins that express in nonnodulating species were extensively found in lower and higher plants. This study examined the genetic diversity at non-symbiotic hemoglobin paralogs, which are all located on the third chromosome of Oryza. Tajima’s D values were estimated from noncoding and coding regions, as well as from nonsynonymous and synonymous substitution sites for examing modes of natural selection. Significicant negative Tajima’s D valus are detected in the four members of RHB gene family of wild rice due to excessive low-frequency polymorphisms among nucleotide sequences. The phenomenon prevails in most genes of wild rice, common effects of recent demographic expansion. HKA statistics suggests that all RHB paralogs are shaped by negative selection. Based on the dN/dS ratio and sliding window analysis also confirm the above selection mode of RHB gene family in Oryza. Tzen-Yuh Chiang 蔣鎮宇 2005 學位論文 ; thesis 91 zh-TW |
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碩士 === 國立成功大學 === 生物學系碩博士班 === 93 === Rice, one of the most important crops, provide a half of world populations with a staple food. In plants, hemoglobin genes have long been considered to exist only in nitrogen-fixing nodules. Non-symbiotic hemoglobins that express in nonnodulating species were extensively found in lower and higher plants. This study examined the genetic diversity at non-symbiotic hemoglobin paralogs, which are all located on the third chromosome of Oryza. Tajima’s D values were estimated from noncoding and coding regions, as well as from nonsynonymous and synonymous substitution sites for examing modes of natural selection. Significicant negative Tajima’s D valus are detected in the four members of RHB gene family of wild rice due to excessive low-frequency polymorphisms among nucleotide sequences. The phenomenon prevails in most genes of wild rice, common effects of recent demographic expansion. HKA statistics suggests that all RHB paralogs are shaped by negative selection. Based on the dN/dS ratio and sliding window analysis also confirm the above selection mode of RHB gene family in Oryza.
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author2 |
Tzen-Yuh Chiang |
author_facet |
Tzen-Yuh Chiang Hsiu-Hui Pan 潘秀惠 |
author |
Hsiu-Hui Pan 潘秀惠 |
spellingShingle |
Hsiu-Hui Pan 潘秀惠 Molecular Evolution of the Non-symbiotic Hemoglobin Gene Family in Oryza rufipogon and Oryza nivara |
author_sort |
Hsiu-Hui Pan |
title |
Molecular Evolution of the Non-symbiotic Hemoglobin Gene Family in Oryza rufipogon and Oryza nivara |
title_short |
Molecular Evolution of the Non-symbiotic Hemoglobin Gene Family in Oryza rufipogon and Oryza nivara |
title_full |
Molecular Evolution of the Non-symbiotic Hemoglobin Gene Family in Oryza rufipogon and Oryza nivara |
title_fullStr |
Molecular Evolution of the Non-symbiotic Hemoglobin Gene Family in Oryza rufipogon and Oryza nivara |
title_full_unstemmed |
Molecular Evolution of the Non-symbiotic Hemoglobin Gene Family in Oryza rufipogon and Oryza nivara |
title_sort |
molecular evolution of the non-symbiotic hemoglobin gene family in oryza rufipogon and oryza nivara |
publishDate |
2005 |
url |
http://ndltd.ncl.edu.tw/handle/63754790584242448915 |
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