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首頁(yè)> 外文學(xué)位 >Two in the bush: On the evolution, distribution and natural history of dioecy in Australian Solanum.
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Two in the bush: On the evolution, distribution and natural history of dioecy in Australian Solanum.

機(jī)譯：叢林中的兩個(gè)：關(guān)于澳大利亞茄屬的對(duì)生的演變，分布和自然歷史。

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摘要

The causes, consequences, and correlates of dioecy have been the subject of much discussion since the days of Charles Darwin's work. Several more recent authors have stressed the importance of informing this body of theory with studies that focus on lineages in which both dioecy and hermaphroditism are present. The genus Solanum is an ideal group for this kind of analysis because dioecy, hermaphroditism, and potential unisexual transitions between them all occur. I present phylogenetic hypotheses for the Australian species included by Symon in Solanum subgenus Leptostemonum (the "spiny solanums") section Melongena. Ten of the 14 currently described dioecious species in the genus are included in this group. Phylogenetic results from ITS, trnK-matK , and morphological datasets support a single origin of dioecy in Australian Solanum. I hypothesize that that was followed by a radiation of perhaps 12 new species in the subarid tropics of northern Australia. The transition to dioecy in Australian Solanum originated from a widespread background of andromonoecy in subgenus Leptostemonum. The causes, mechanisms, and maintenance of dioecy in Australian Solanum are explored within a natural history context. Specifically, the roles of local pollinator and frugivore communities are discussed. This study significantly improves the understanding of a poorly known group of species within an economically-important plant group, and should contribute in a positive way to conservation efforts focusing on rare and unusual spiny solanums and their habitats in northern Australia.
機(jī)譯：自從查爾斯·達(dá)爾文（Charles Darwin）的工作以來(lái)，對(duì)偶關(guān)系的原因，后果和相關(guān)性一直是許多討論的主題。最近有幾位作者強(qiáng)調(diào)通過研究集中于雌雄同體和雌雄同體的血統(tǒng)的研究來(lái)告知這一理論的重要性。茄屬是此類分析的理想組，因?yàn)樗鼈冎g都發(fā)生了雌雄異體，雌雄同體以及潛在的單性轉(zhuǎn)換。我介紹了西蒙（Symon）在茄屬（Leptostemonum）茄屬（Spiny solanums）節(jié)Melongena中包含的澳大利亞物種的系統(tǒng)發(fā)育假說(shuō)。該屬中目前描述的14種雌雄異株物種中有10種屬于這一類。來(lái)自ITS，trnK-matK和形態(tài)數(shù)據(jù)集的系統(tǒng)發(fā)育結(jié)果支持澳大利亞茄科植物的雙生起源。我假設(shè)這是在澳大利亞北部的亞熱帶熱帶地區(qū)輻射的大約12種新物種。澳大利亞茄屬植物向雌雄異體的過渡起源于Leptostemonum亞屬中雄激素的廣泛背景。在自然歷史背景下探討了澳大利亞茄屬的對(duì)偶關(guān)系的成因，機(jī)制和維持。具體來(lái)說(shuō)，討論了當(dāng)?shù)貍鞣勖浇楹凸?jié)食者社區(qū)的作用。這項(xiàng)研究極大地增進(jìn)了對(duì)在經(jīng)濟(jì)上重要的植物群中一個(gè)鮮為人知的物種群體的了解，并應(yīng)為保護(hù)工作做出積極貢獻(xiàn)，這些努力集中在澳大利亞北部稀有和不尋常的刺茄及其棲息地。

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    University of Connecticut.;

  • 授予單位 University of Connecticut.;
  • 學(xué)科 Botany.
  • 學(xué)位 Ph.D.
  • 年度 2006
  • 頁(yè)碼 155 p.
  • 總頁(yè)數(shù) 155
  • 原文格式 PDF
  • 正文語(yǔ)種 eng
  • 中圖分類
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