Phylogenetic Relationship between Degree of Self-compatibility and Floral Traits in Lilium longiflorum Thunb. (Liliaceae)
Phylogenetic Relationship between Degree of Self-compatibility and Floral Traits in Lilium longiflorum Thunb. (Liliaceae)
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DOI：
10.2503/jjshs1.81.80
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Okubo, Hiroshi
中科院分区：
文献类型：
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作者：
Sakazono, Satomi;Hiramatsu, Michikazu;Okubo, Hiroshi
长花百合是日本琉球群岛的特有种，也是台湾大陆东部海岸和卫星岛的特有种。该种是一种重要的观赏植物，在世界各地都有栽培。长花百合一直被认为是自交不亲和的物种，但以往的研究表明，在一些自然居群中存在自交。为了证实自交亲和个体的存在，并通过比较分析阐明与自交亲和程度相关的花性状的进化转变，我们使用了17个长花连翘种群和2个长花连翘种群(遗传距离最近的长花连翘)，覆盖了整个物种分布。人工自交授粉表明，并不是所有的长花连翘个体都是自交不亲和的，长花连翘个体和居群之间的自交不亲和性存在很大的数量差异。自交亲和的优势种群在物种分布区的边缘、琉球群岛北部和台湾地区异地独立进化。琉球群岛的花冠长度、花冠宽度、花冠体积和花药长度的减少，与台湾的花冠宽度和花药体积的减少相反，长花柳树自交亲和性的增加与花冠长度的减少有关。没有观察到花药和柱头之间的联系。我们的资料显示，琉球群岛的花卉自交亲和性逐渐增强，进化出与交配系统进化有关的花卉性状，而不依赖于花药与柱头位置的邻接性，但在台湾则不是。
Lilium longiflorum is endemic to the islands of the Ryukyu Archipelago in Japan and to the eastern seacoasts and satellite islands of the mainland of Taiwan. The species is an important ornamental plant, and is cultivated throughout the world. Lilium longiflorum has long been regarded as a self-incompatible species but the existence of selfing in some natural populations was suggested by isozyme analysis in a previous study. To confirm the occurrence of self-compatible individuals and to clarify the evolutionary shift of floral traits associated with degree of self-compatibility in L. longiflorum by comparative analysis, we used 17 populations of L. longiflorum, and two populations of L. formosanum, the genetically closest species of L. longiflorum, covering the entire species distribution. Artificial self-pollination revealed that not all L. longiflorum individuals are self-incompatible and there is substantial quantitative variation of self-incompatibility among L. longiflorum individuals and populations. Self-compatible dominant populations allopatrically and independently evolved at the periphery of the species distribution area, the northern Ryukyu Archipelago and Taiwan. Increasing degree of self-compatibility in L. longiflorum correlated with reduced corolla length, corolla width, corolla volume, and anther length for the Ryukyu Archipelago, in contrast to only reduced corolla width and volume for Taiwan. Approach between anther and stigma was not observed in any populations. Our data indicate that in the Ryukyu Archipelago increasing degree of self-compatibility evolved floral traits related to mating system evolution, to selfing, that does not depend on adjacency between anther and stigma position, but not in Taiwan.