VARIATION IN FLORAL FRAGRANCES AND MORPHOLOGY - INCIPIENT SPECIATION IN CYCNOCHES
VARIATION IN FLORAL FRAGRANCES AND MORPHOLOGY - INCIPIENT SPECIATION IN CYCNOCHES
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DOI：
10.1086/337412
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发表时间：
1983-01-01
影响因子：
--
通讯作者：
GREGG, KB
中科院分区：
文献类型：
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作者：
GREGG, KB
描述了4种巴拿马苏铁属植物的花色、唇瓣形态和香味的变异。野芝麻缺乏气味可检测的鼻子或气相色谱法（GC）从C。金合欢并获得了C. diluent Rchb. f.根据权利要求1，C. densiflorum Rolfe和密花C.千金藤表明每一种都应该被视为一个明确定义的物种。气味配置文件计算从8小时内从植物切除的薄片产生的香味。这些配置文件没有明显不同，从切除的整个花序或从保持在植物上的花。Labella可靠地生产大量的芳香化合物，这些化合物易于在小容器中在1小时内浓缩。每种植物的雄花和雌花产生相同的气味。个体植物之间的气味特征的差异发生在样本种群内。GC检测到两种C. densiflorum和C.不稳定。在前者中，一半的克隆产生α-和β- 37%或更多的是蒎烯（平均值= 67.7 ±. 6.8)另一半具有49.5%或更少的α-和β-蒎烯（平均值= 43.6 ± 0.01）。5.3）。对C. Dianae，35%既不产生α-或β-松烯。微进化和可能的同域物种在这些兰花进行了讨论。
Variation in flower color, labellum morphology and fragrance are described for 4 Panamanian species of Cycnoches previously considered to be C. egertonianum Batem. A lack of odor detectable by nose or gas chromatography (GC) from C. aureum Lindl. and distinct odor profiles obtained for C. dianae Rchb. f., C. densiflorum Rolfe and C. stenodactylon Schltr. indicate that each should be recognized as a well-defined species. Odor profiles were calculated from fragrances produced by lamella within 8 h of excision from the plants. These profiles did not differ appreciably from those obtained from excised whole inflorescences or from flowers maintained on the plants. Labella reliably produced copious amounts of fragrance compounds that were easy to concentrate within 1 h in small containers. Male and female flowers of each species produced the same scent. Differences in odor profiles among individual plants occurred within sample populations. Two fragrance chemotypes were detected by GC for C. densiflorum and C. dianae. In the former, half the clones produced .alpha.- and .beta.-pinene as 37% or more (mean = 67.7 .+-. 6.8) of their profiles; the other half had odors with 49.5% or less .alpha.- and .beta.-pinene (mean = 43.6 .+-. 5.3). Of the clones of C. Dianae, 35% produced neither .alpha.- nor .beta.-pinene. Microevolution and possible sympatric speciation in these orchids are discussed.