Variation in floral morphology within a population of Aster hispidus var. tubulosus (Asteraceae, Astereae).
Variation in floral morphology within a population of Aster hispidus var. tubulosus (Asteraceae, Astereae).
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Aster hispidus var. 种群内花形态的变异。
DOI：
10.1111/1442-1984.12027
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M.
中科院分区：
文献类型：
--
作者：
Nakagawa;S. and Ito;M.
菊科有一种特殊的花序，即头状花序，由伞状小花和盘状小花组成。舌状花的功能就像花瓣一样吸引传粉者。显着的变化，在射线小花形态是已知的，在一个自然群体ofAster hispidusvar.tubulosus（菊科）。通过对这些变异的分析，发现舌音小花有两种不同的类型：长管状舌音小花和舌状舌音小花。因此，在本种中，头状花序是基本的授粉单位，它们之间的花形态的变异是由头状花序之间两种舌状花类型的组成的变异引起的。我们使用分层分析评估了在种群内头状花序之间观察到的花形态变异的来源，该分层分析将个体内（即每个个体内的头状花序之间）和变异的个体成分之间分开。我们发现，变异的主要来源在于个体间水平，而不是嵌套在个体内的头状突间水平。这一发现将提供基础知识，使未来的研究探索是否由射线小花类型的组成变化引起的花形态的个体间变异导致菊科物种中个体植物的差异授粉成功。
The family Asteraceae has a particular inflorescence, the capitulum, consisting of ray florets and disc florets. The ray florets function as petals that attract pollinators. Marked variation in the ray floret morphology is known in a natural population ofAster hispidusvar.tubulosus(Asteraceae). We analyzed the variation and found two distinct types in the ray florets, the long tubular ray floret and the ligulate ray floret. In this species, therefore, the variation in floral morphology among capitula, each of which is the basic pollination unit, is caused by the variation in the composition of the two ray floret types among capitula. We evaluated the sources of the observed variation in the floral morphology among capitula within a population using a hierarchical analysis that separated within‐individual (i.e. among capitula within each individual) and between‐individual components of the variation. We found that the main source of the variation lay at the between‐individual level, not at the between‐capitulum level nested within individuals. This finding will provide the basic knowledge that enables future study exploring whether the between‐individual variation in floral morphology caused by the compositional variation of the ray floret types leads to differential pollination success of individual plants in species of Asteraceae.