Department of Biosciences, Plant Ecology, University of Salzburg, Hellbrunnerstr. 34, 5020 Salzburg, Austria.
IONICON Analytik Gesellschaft m.b.H., Eduard-Bodem-Gasse 3, 6020 Innsbruck, Austria.
Phytochemistry. 2018 Oct;154:77-84. doi: 10.1016/j.phytochem.2018.07.001. Epub 2018 Jul 10.
In many Araceae both scent and heat production are known to temporally vary throughout anthesis, and in several species strong scents are released for pollinator attraction when thermogenesis is also strong. However, it is not known whether the temporal patterns of both scent emission and temperature are strictly synchronous and, for example, reach their maxima at the same time. We studied Arum maculatum, a brood-site deceptive species attracting its moth fly pollinators with strong fetid scents, to study temporal patterns in scent emission and temperature during anthesis. Inflorescence scents were collected and analysed by dynamic headspace and gas chromatography-mass spectrometry (GC-MS) or by proton-transfer-reaction-time-of-flight mass spectrometry (PTR-TOFMS), and the temperature of the appendix, which is the heating osmophore during pollinator attraction, was recorded by a thermocouple. We overall found that scent emission and temperature patterns were strongly correlated. However, in none of the seven studied individuals was the highest amount of scent released at times with the maximum temperature difference. Thus, patterns of scent emission and temperature are somewhat asynchronous suggesting that high scent emission rates and temporal scent patterns in plants with thermogenesis cannot be solely explained by temperature patterns. This calls for more in-depth studies to better understand the interplay between scent emission and thermogenesis.
在许多天南星科植物中，香气和热量的产生在整个花期都会发生时间变化，并且在几个物种中，当热产生强烈时，强烈的香气会被释放出来吸引传粉者。然而，目前还不清楚香气释放和温度的时间模式是否严格同步，例如，它们是否同时达到最大值。我们研究了 Arum maculatum，一种育雏场欺骗性物种，它用强烈的恶臭气味吸引飞蛾传粉者，以研究花期香气释放和温度的时间模式。通过动态顶空和气相色谱-质谱联用 (GC-MS) 或质子转移反应-飞行时间质谱 (PTR-TOFMS) 收集和分析花序香气，并通过热电偶记录在吸引传粉者期间作为加热嗅源的附属物的温度。我们总体上发现，香气释放和温度模式密切相关。然而，在七个研究个体中，没有一个个体在温度差最大时释放出最大量的香气。因此，香气释放和温度的模式有些不同步，这表明具有热产生的植物中高的香气释放率和时间香气模式不能仅用温度模式来解释。这需要更深入的研究，以更好地理解香气释放和热产生之间的相互作用。
