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《植物生态学报》2017,41(5):549
Aims Chemical communication plays a key role in host plant recognition of pollinators. There are two recognized types of chemical communication between syconia and their pollinating fig wasps: one is “generalization”, of which the wasps respond to the relative ratio of multiple compounds, and the other is “specialization”, of which the key signal is a single uncommon, possibly unique, compound. The aims of this study were to identify the chemical composition of volatiles from the syconia of Ficus microcarpa at different developmental phases, and to determine if the signaling between F. microcarpa and its pollinating fig wasp, Eupristina verticillata, is of generalized type, or of specialized type.Methods The volatiles from syconia of F. microcarpa were extracted using solid-phase micro extraction (SPME) at different developmental phases (pre-female, female (before and after pollination), interfloral, male and postfloral phases) and the chemical compounds were identified by gas chromatography mass spectrometry (GC-MS). We then tested the behavioral responses of E. verticillata to fresh syconia at different developmental phases using two-choice olfactometers.Important findings There were 21 volatile compounds identified from the syconia at different developmental phases, which were mainly fatty acid derivatives, terpenoids and aromatic compounds. The components of the volatiles apparently differed among the developmental stages. The contents of terpenoids declined, but the contents of fatty acid derivatives increased, from before the pollination to after the pollination. Especially, the characteristic compounds of 2-heptanone and 3-octanone before the pollination disappeared, D-limonene decreased after the pollination, but copanene, cyclohexane and 2-hexenal increased. The results of the two-choice olfactometer experiment showed that the pollinating fig wasps had higher selection ratio to chemicals found in the female phase syconia than those in other phases; whereas the volatile compounds from the male phase syconia had the function pushing the pollinating fig wasps to leave the natal syconia so that there existed the “push-pull” responses by fig wasps to volatiles released by their host syconia. We conclude that there are multiple chemical compounds playing the roles in host recognition of pollinating fig wasp E. verticillata. The mutualistic relationship between F. microcarpa and E. verticillata is maintained by the chemical communication of “generalization” strategy. 相似文献
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以金沙江干热河谷特有植物白魔芋(Amorphophallus albus P.Y.Liu et J.F.Chen)为对象,分别在两个就地栽培实验地(四川金阳、云南永善)和一个异地栽培实验地(富源)进行传粉生物学研究(包括交配系统及气味和传粉昆虫对其繁殖策略的影响)。结果显示,白魔芋是雌雄异熟且雌蕊先熟,雌花期时,附属器散发浓烈的恶臭气味。经气相色谱-质谱联用仪(GC-MS)分析,花气味成分主要为二甲基二硫和二甲基三硫。野外观察到的传粉昆虫属于隐翅虫科(Staphylinidae),包括前角隐翅虫亚科(Aleocharinae)的Atheta sp.和颈隐翅虫亚科(Oxytelinae)的Anotylus sp.。经气相色谱-触角电位联用技术(GC-EAD)分析表明,隐翅虫触角对白魔芋花气味中的二甲基二硫和二甲基三硫有明显的反应。授粉结果显示,金阳、永善和富源3个实验地人工自花授粉和套袋的结实率都为0,无传粉昆虫的富源实验地自然结实率也为0。综合研究结果表明白魔芋属于自交不亲和的交配系统,通过花序结构和气味吸引隐翅虫为其传粉,并提供食物和交配场所作为回报。该研究为白魔芋的繁殖育种提供了基础资料,为植物与昆虫之间的协同进化提供了进一步的理论支持,同时为白魔芋的有效保护和利用提供了理论依据和技术指导。 相似文献
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