GEOGRAPHIC DIVERGENCE IN FLORAL MORPHOLOGY AND SCENT IN LINANTHUS DICHOTOMUS (POLEMONIACEAE)
GEOGRAPHIC DIVERGENCE IN FLORAL MORPHOLOGY AND SCENT IN LINANTHUS DICHOTOMUS (POLEMONIACEAE)
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DOI：
10.3732/ajb.0800118
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发表时间：
2008-12-01
影响因子：
3
通讯作者：
LeBuhn, Gretchen
中科院分区：
文献类型：
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作者：
Chess, Sally K. R.;Raguso, Robert A.;LeBuhn, Gretchen
花的生殖形态和气味对于传粉者在指导觅食决策方面是最重要的。我们比较了两个亚种的花香和生殖形态，这两个亚种在地理上和开花时间上是有区别的。Dihotomus和昼夜L.dichotomus亚种。Meridannus。这两个亚种之间开花时间的差异伴随着访花的不同。采用动态顶空气相法采集花的挥发物，用气相色谱和质谱仪对其进行分析。这些亚种总共产生了39种花香化合物。亚种在吸引夜蛾月份的挥发物(例如丁香醛)和更一般的访客(例如苯乙醛)的数量模式上有所不同，但在总体气味释放率上没有差异。基于气味样本的判别函数分析在86%的时间内正确区分这两个亚种。我们测量了7个生殖形态性状：区分两个亚种的判别函数分析，基于形态样本的81%的时间。我们发现亚种间在气味方面存在显著差异，但个体形态特征没有显著差异。这里提出的证据与传粉者中介选择的假说最为一致。
Floral reproductive morphology and scent are of primary importance to pollinators in guiding foraging decisions. We compared the floral scent and reproductive morphology between two subspecies of Linathus dichotomus (Polemoniaceae) that are taxonomically distinguished by geography and flowering time: the vespertine L. dichotmus subsp. dichotomus and diurnal L. dichotomus subsp. meridannus. Disparity in flowering time between the two subspecies is accompained by differences in flower visitors. We collected floral volatiles using dynamic headspace methods analyzed them using gas chromatography and mass spectroscopy. Together, the subspecies produced a total of 39 floral scent compounds. Subspecies differ in the quantiative pattern of volatiles that attract noctuid month (e.g., lilac aldchydes) vs. a more general suite of visitors (e.g., phenylacctaldehyde), but not in overall scent emission rates. A discriminat function analysis correctly distinguished between the two subspecies based on scent sample 86% of the time. We measured seven reproductive morphological traits: a discriminant function analysis distinguished between the two subspecies based on morphological samples 81% of the time. We found significant differences between subspecies in scent but not individual morphological traits. The evidence presented here is most consistent with a hypothesis of pollinator-mediated selection.