Synchronous coadaptation in an ancient case of herbivory
Synchronous coadaptation in an ancient case of herbivory
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DOI：
10.1073/pnas.2133013100
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发表时间：
2003-10-28
影响因子：
11.1
通讯作者：
Becerra, JX
中科院分区：
文献类型：
--
作者：
Becerra, JX
长期以来，协同进化一直被认为是导致昆虫和植物适应性辐射和多样化的主要力量。共同进化的一个基本方面是适应和反适应在时间上交错。在假定的共同进化选择压力起源之前或之后很久，性状的不协调起源必须归因于其他进化过程。尽管这种区别对我们理解共同进化很重要，但植物防御和昆虫反防御创新的宏观进化克里思尚未被记录在案。分子钟的一个谱系的属Blepharida和Burseraceae主机的chrysomelid甲虫进行了独立校准。结果表明，这些植物的防御和昆虫的防御性进食特征大致同步进化，为植物-食草动物同步共适应提供了宏观进化证实。这两组生物之间的关系被确定为大约1.12亿年，是迄今为止专门的植物-食草动物关系中最古老的年龄。
Coevolution has long been considered a major force leading to the adaptive radiation and diversification of insects and plants. A fundamental aspect of coevolution is that adaptations and counteradaptations interlace in time. A discordant origin of traits long before or after the origin of the putative coevolutionary selective pressure must be attributed to other evolutionary processes. Despite the importance of this distinction to our understanding of coevolution, the macroevolutionary tempo of innovation in plant defenses and insect counterdefenses has not been documented. Molecular clocks for a lineage of chrysomelid beetles of the genus Blepharida and their Burseraceae hosts were independently calibrated. Results show that these plants' defenses and the insect's counterdefensive feeding traits evolved roughly in synchrony, providing macroevolutionary confirmation of synchronous plant-herbivore coadaptation. The association between these two groups of organisms was determined to be about 112 million years old, the oldest age so far for a specialized plant-herbivore association.