S組山羊草屬Psy1基因片段的克隆與序列分析
發(fā)布時間:2018-03-17 09:59
本文選題:小麥籽粒黃色素 切入點:山羊草 出處:《麥類作物學(xué)報》2017年04期 論文類型:期刊論文
【摘要】:類胡蘿卜素含量是影響小麥面制品色澤的主要因素,而Psy1基因則是類胡蘿卜素生物合成中的關(guān)鍵基因。為了了解小麥近緣種S組山羊草的Psy1基因多樣性分布規(guī)律,以高大山羊草、雙角山羊草及西爾斯山羊草為材料,應(yīng)用同源基因克隆技術(shù)對其進(jìn)行Psy1基因克隆。結(jié)果表明,利用分子標(biāo)記YP7B-5檢測獲得的8個新Psy1-S1等位變異的部分序列覆蓋了Psy1基因的第二外顯子和第二內(nèi)含子的全部以及第三外顯子93.1%的區(qū)域。在與包括來自普通小麥的Psy1-B1d、栽培二粒小麥的Psy1-B1k以及擬斯卑爾脫山羊草的Psy1-S1a、Psy1-S1b、Psy1-S1c對應(yīng)部分的序列綜合分析發(fā)現(xiàn)一致性高達(dá)93.4%~98.5%,而且編碼區(qū)序列差異均為同義突變,沒有造成編碼氨基酸的變化。而第二內(nèi)含子序列則存在數(shù)個SNP及InDel,尤其是Psy1-S1h的161bp大片段插入和Psy1-S1i的177bp大片段缺失,導(dǎo)致與其他Psy1-B1/Psy1-S1等位變異產(chǎn)生較大的長度差異。分析表明,內(nèi)含子的差異是造成Psy1基因多樣性的主要原因。
[Abstract]:The content of carotenoids is the main factor affecting the color of wheat flour products, while the Psy1 gene is the key gene in the biosynthesis of carotenoid. The Psy1 gene of Leymus chinensis, Leymus biangularis and Leymus Sears were cloned by homologous gene cloning technique. The partial sequences of eight new Psy1-S1 alleles detected by molecular marker YP7B-5 covered all the exons 2 and introns 2 of the Psy1 gene and the region of exon 93.1% of the third exon. The sequence analysis of Psy1-B1k and Psy1-S1a Psy1-S1b Psy1-S1c of cultivated wheat and Leymus spellolata showed that the consistency was 93.4% and 98.5%, and the sequence difference of coding region was synonymous mutation. There were several SNP and InDels in the second intron sequence, especially the 161bp large fragment insertion of Psy1-S1h and the 177bp deletion of Psy1-S1i, which resulted in significant length differences with other Psy1-B1/Psy1-S1 alleles. The difference of intron is the main reason for the diversity of Psy1 gene.
【作者單位】: 長江大學(xué)農(nóng)學(xué)院;西北農(nóng)林科技大學(xué)農(nóng)學(xué)院;中國農(nóng)業(yè)科學(xué)院作物科學(xué)研究所/國家小麥改良中心;國際玉米小麥改良中心;CIMMYT中國辦事處;
【基金】:長江大學(xué)博士科研啟動基金項目(118/801180010115)
【分類號】:S512.1
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本文編號:1624235
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