本文選題：半日花 + 譜系地理學(xué)�。� 參考：《內(nèi)蒙古農(nóng)業(yè)大學(xué)》2017年碩士論文

【摘要】：半日花(Helianthemum Soongoricum)是半日花科的一種半灌木或灌木,我國內(nèi)蒙古和新疆有兩種分布,分別是內(nèi)蒙古半日花和新疆半日花,由于種群數(shù)量稀少,現(xiàn)已被國家列為二級保護(hù)植物。開展半日花種群遺傳多樣性和譜系地理結(jié)構(gòu)的研究,對于揭示內(nèi)蒙古、新疆荒漠植物區(qū)系和地中海植物區(qū)系的起源、遷移以及演化具有重要意義。本研究采用cpDNA的2個(gè)非編碼區(qū)對半日花的遺傳多樣性和譜系地理結(jié)構(gòu)進(jìn)行了研究,主要研究結(jié)果如下:(1)基于trnc-ycf6、psbj-peta以及兩個(gè)片段聯(lián)合分析,內(nèi)蒙古各種群總遺傳多樣性高于新疆各種群,且Fst(0.9583、0.96030、0.98160)都達(dá)到了顯著差異水平,半日花種群間的變異大于種群內(nèi)的變異,遺傳變異主要存在于種群間。且NstGst,表明半日花種群間存在譜系地理結(jié)構(gòu)。(2)對半日花種群的錯(cuò)配分析和中性檢測的結(jié)果來看,半日花在歷史上經(jīng)歷過明顯的群體擴(kuò)張。單倍型最大簡約樹和網(wǎng)絡(luò)狀圖分析表明半日花種群有明顯的地理分布格局。(3)單倍型和BEAST分析表明,半日花大約在2.0296-2.5525百萬年間分化為內(nèi)蒙古支系和新疆支系,兩個(gè)支系分化后獨(dú)立進(jìn)化,從而形成了現(xiàn)代的分布格局。半日花譜系地理學(xué)分析結(jié)果支持將內(nèi)蒙古種群另立為一新種的觀點(diǎn)。(4)建議在內(nèi)蒙古增加千里溝自然保護(hù)區(qū)和新疆伊犁自然保護(hù)區(qū),對于人為開發(fā)生境破壞嚴(yán)重的地區(qū)可以考慮進(jìn)行遷地保護(hù)。
[Abstract]:Helianthemum Soongoricum (Helianthemum Soongoricum) is a kind of semi-shrub or shrub of the family Helianthemum. There are two species of Helianthemum Soongoricum in Inner Mongolia and Xinjiang, respectively. Because of the scarcity of population, Helianthemum Soongoricum has been listed as the second class protected plant in China. It is important to study the genetic diversity and phylogenetic structure of semidiurnal flower population in Inner Mongolia Xinjiang desert flora and Mediterranean floristic origin migration and evolution. In this study, two non-coding regions of cpDNA were used to study the genetic diversity and phylogenetic structure of sunflower. The main results were as follows: (1) based on trnc-ycf6 psbj-peta and two fragments, The total genetic diversity of various populations in Inner Mongolia was higher than that in Xinjiang, and FST (0.9583C0.960300.98160) reached the level of significant difference. The variation among populations was greater than that within populations, and the genetic variation mainly existed among populations. Moreover, NstGst. shows that there is a phylogenetic structure among the populations. (2) the results of mismatch analysis and neutral detection show that the population has experienced obvious population expansion in the history. (3) the haplotype and BEAST analysis showed that the hemihelias were divided into Inner Mongolia branch and Xinjiang branch in about 2.0296-2.5525 million years. The two branches evolved independently after differentiation, thus forming a modern distribution pattern. The results of geographical analysis support the idea that Inner Mongolia population should be established as a new species. (4) it is suggested to increase the Qianligou Nature Reserve and the Xinjiang Yili Nature Reserve in Inner Mongolia. Relocation protection may be considered for areas where artificial exploitation of habitats is seriously damaged.
【學(xué)位授予單位】：內(nèi)蒙古農(nóng)業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：Q948

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 魏磊;白沙如拉;S惱，

本文編號：2109788