草食动物影响植物种子萌发的整合分析

Effects of herbivores on seed germination by meta analysis

在Janzen提出"双F假说"之后,草食动物对植物种子的消化道传播的观点就被广泛接受并做了大量的研究工作。同时也出现了植物和草食动物之间是否存在协同进化的问题,并针对这一问题产生了很多争论。为此,本研究收集了近年来有关草食动物对植物种子的消化道传播的研究数据,然后通过整合分析结合PIC技术对其进行二次分析。结果表明,1)物种亲缘关系决定了种子对消化道作用后的反应,大部分植物表现出亲缘关系越近则反应越趋于一致,但个别亲缘关系较近的植物对消化道传播的反应则没有趋同性。2)食草动物种类不同,则被消化后同一种植物种子萌发率有所差别,主要是由于不同食草动物体消化道内部结构及内环境有很大差别,使种子在其内部滞留时间有长有短,从而导致种子被消化后的萌发率存在差异。

After Janzen proposed ＂Double F Hypothesis＂, the endozoochorous of herbivores on plant seeds was widely accepted and a lot of related researches have been done. Meanwhile, question of if there is co-evolution between plants and herbivores, and a lots of debates also generated. Researches related to endozoochorous of herbivores on plant seeds were collected and secondary analyzed using meta-analysis method and PIC technology. The results showed that： 1） Responses of seeds to effects of digestive tract was determined by genetic relationships of species. Most plant performed the closer their genetic relation- ships, the more similar their responses. There are still some plants which have close genetic relationships but no convergence on their responses. 2） Seeds of the same s;pecies which were digested by different herbivores had different germination rates. This mainly because different herbivores have different digestive tract structures and internal environments, and then the time what seeds stay in digestive tract is differed. Finally, germination rates of these seeds are varied.