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植物学报  2013 

东乡野生稻基因渐渗系中逆转座子逆转录酶序列的克隆及表达分析

DOI: 10.3724/SP.J.1259.2013.00138, PP. 138-144

Keywords: 东乡野生稻,表达活性,渐渗系,逆转座子

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Abstract:

?以东乡野生稻(Oryzarufipogon)耐冷渐渗系IL5335、IL5243及其双亲为试材,克隆到75条存在高度异质性的Ty1-copia类逆转座子逆转录酶序列,经聚类分析将这些逆转录酶序列分为7个家族;家族6和7含有65条逆转录酶序列,序列间的相似性为44.9%–99.3%;家族1–5仅含10条逆转录酶序列,其中8条来源于耐冷渐渗系,它们与亲本的序列相似性为29.2%–52.8%,分析发现这些序列曾发生缺失或插入突变。实时荧光定量PCR检测结果显示,IL5335和IL5243中的houba、osr15及osr17逆转录酶的表达量均远高于受体亲本(表达量增加1.50–5.07倍),表明渐渗杂交诱发改变了IL5335和IL5243中逆转录酶序列的结构及其表达活性。该结果为今后水稻表观遗传学研究及外源优异基因利用奠定了基础。

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