An ancient push-pull pollination mechanism in cycads
An ancient push-pull pollination mechanism in cycads
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DOI：
10.1126/sciadv.aay6169
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发表时间：
2020-06
期刊：
影响因子：
13.6
通讯作者：
Shayla Salzman;D. Crook;J. Crall;R. Hopkins;N. Pierce
中科院分区：
文献类型：
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作者：
Shayla Salzman;D. Crook;J. Crall;R. Hopkins;N. Pierce
产热推拉机制是苏铁特有的亲代寄生虫授粉系统的祖先特征。大多数苏铁参与幼虫现场授粉互惠，然而苏铁目从不同的昆虫互助者那里引诱授粉服务的机制尚不清楚。在这里，我们描述了一种新大陆苏铁和它的象虫传粉者之间的推拉授粉机制，这反映了一种远亲的东半球苏铁和它的蓟马传粉者之间的机制。象甲和蓟马之间的行为趋同，结合分子系统发育测年和对产热作用的荟萃分析，以及挥发性吸引和排斥的协调模式，表明推拉授粉互惠策略在这个古老的雌雄异株植物群中是起源的。因此，它可能是最早的昆虫/植物授粉机制之一，在开花植物通常使用的视觉花信号进化之前很久就出现了。
Thermogenic push-pull mechanisms are ancestral features of the specialized brood parasite pollination system of cycads. Most cycads engage in brood-site pollination mutualisms, yet the mechanism by which the Cycadales entice pollination services from diverse insect mutualists remains unknown. Here, we characterize a push-pull pollination mechanism between a New World cycad and its weevil pollinators that mirrors the mechanism between a distantly related Old World cycad and its thrips pollinators. The behavioral convergence between weevils and thrips, combined with molecular phylogenetic dating and a meta-analysis of thermogenesis and coordinated patterns of volatile attraction and repulsion suggest that a push-pull pollination mutualism strategy is ancestral in this ancient, dioecious plant group. Hence, it may represent one of the earliest insect/plant pollination mechanisms, arising long before the evolution of visual floral signaling commonly used by flowering plants.