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首页> 外文期刊>Journal of the American Society for Horticultural Science >Nuclear and Cytoplasmic DNA Sequence Data Further Illuminate the Genetic Composition of Leyland Cypresses
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Nuclear and Cytoplasmic DNA Sequence Data Further Illuminate the Genetic Composition of Leyland Cypresses

机译：核和细胞质DNA序列数据进一步阐明了莱兰y柏的遗传组成

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摘要

Leyland cypress [xHesperotropsis leylandii (A.B. Jacks. & Dallim.) Garland & G. Moore, Cupressaceae] is a well-known horticultural evergreen conifer in the United Kingdom, United States, Australia, New Zealand, and other countries. As demonstrated by previous studies, this taxon is a hybrid between alaska (nootka) cypress [Callitropsis nootkatensis (D. Don) Oerst ex D.P. Little] and monterey cypress [Hesperocyparis macrocarpa (Hartw. ex Gordon) Bartel]. However, the genetic background of leyland cypress cultivars is unclear. Are they F-1 or F-2 hybrids or backcrosses? In this study, six individuals that represent major leyland cypress cultivars and two individuals each of its two putative parental species were collected, and three nuclear DNA regions (internal transcribed spacer, leafy and needly), three mitochondrial (mt) DNA regions (coxI, atpA, and rps3), and two chloroplast (cp) DNA regions (matK and rbcL) were sequenced and analyzed. Sequencing results of nuclear DNA regions revealed that leyland cypress cultivars consist of putative F-1 and F-2 hybrids as well as backcrosses. Analysis of the cp and mt DNA from six cultivars of leyland cypress revealed that their cytoplasmic (cp and mt) genomes came from alaska cypress. Our findings will provide important instructions and background knowledge on the management of these major leyland cypress cultivars as well as future studies. Meanwhile, alaska cypress and monterey cypress may have diverged with each other approximate to 46 million years ago. The fact that they can produce fertile hybrids indicates that hybridization events may have played an important role in the evolutionary history of the cypress family (Cupressaceae).
机译：Leyland柏树[xHesperotropsis leylandii（A.B. Jacks。＆Dallim。）Garland＆G. Moore，柏树科]是英国，美国，澳大利亚，新西兰和其他国家/地区的著名园艺常绿针叶树。如先前的研究所证明的，该分类单元是阿拉斯加柏树（Callottropsis nootkatensis（D. Don）Oerst ex D.P. Little]和蒙特雷柏[Hesperocyparis macrocarpa（Hartw。ex Gordon）Bartel]。然而，莱兰柏品种的遗传背景尚不清楚。他们是F-1或F-2杂种还是回交？在这项研究中，收集了代表莱兰柏主要品种的6个个体和两个推定亲本物种的2个个体，分别收集了3个核DNA区（内部转录的间隔区，多叶和有需要的），3个线粒体（mt）DNA区（coxI， atpA和rps3），以及两个叶绿体（cp）DNA区域（matK和rbcL）进行了测序和分析。核DNA区域的测序结果表明，莱兰柏品种由推定的F-1和F-2杂种以及回交组成。对六个莱兰柏品种的cp和mt DNA的分析表明，它们的细胞质（cp和mt）基因组来自阿拉斯加柏。我们的发现将提供有关这些主要莱兰柏品种的管理以及未来研究的重要指导和背景知识。同时，阿拉斯加柏树和蒙特雷柏树可能在大约4,600万年前相互分离。它们可以产生可育的杂种的事实表明，杂交事件可能在柏树科（柏科）的进化史中发挥了重要作用。

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