薇甘菊种群在海南扩张过程中种子大小和萌发性状的进化  

Evolution of seed size and germination traits of Mikania micrantha during population expansion in Hainan

作　　者：朱彬 黄乔乔[1] ZHU Bin;HUANG Qiaoqiao(Key Laboratory of Integrated Pest Management on Tropical Crops,Ministry of Agriculture and Rural Affairs,Environment and Plant Protection Institute,Chinese Academy of Tropical Agricultural Sciences,Haikou 571101,China;College of Plant Protection,Hainan University,Haikou 570228,China)

机构地区：[1]农业农村部热带作物有害生物综合治理重点实验室,中国热带农业科学院环境与植物保护研究所,海口571101 [2]海南大学植物保护学院,海口570228

出　　处：《生态学杂志》2024年第7期1988-1994,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(32071662)资助。

摘　　要：入侵植物经常在新区域扩散,相对于入侵中心,入侵前沿的种群可能进化出不同的性状,如小种子、高萌发率、快速发芽等。本研究以海南扩散的26个薇甘菊(Mikania micrantha)种群为材料,研究其种子大小和萌发性状的进化模式。结果显示,薇甘菊种子萌发率均较高(70%以上)。薇甘菊种群盖度、频度和距入侵中心距离与野外采集和同质园实验收获种子的质量均无显著相关关系。种群盖度与野外采集种子的萌发率、萌发指数呈正相关关系,但与同质园实验收获种子的萌发率、萌发指数无显著相关关系;频度、距入侵中心距离与种子萌发率、萌发指数无显著相关关系。种群盖度、频度、距入侵中心距离与种子萌发速度均无显著相关关系。总体而言,薇甘菊种群在海南岛扩张过程中种子大小和萌发性状的进化规律不明显。Invasive plants often spread in their new range.Populations at the invasion front may evolve traits diffe-ring from those at the invasion center,such as small seed size,high germination rate,and fast germination speed.With 26 spreading Mikania micrantha populations on Hainan Island,this study examined the evolution of seed size and germination traits.The results showed that germination rate of M.micrantha seeds was high(>70%).The cover and frequency of M.micrantha population and distance to invasion center were not significantly related to the mass of seeds collected both in the field and in the common garden experiment.Population cover was positively cor-related with germination rate and germination index of seeds collected in the filed,but not with that of seeds collec-ted in the common garden.Frequency and distance to invasion center were not significantly related to seed germina-tion rate and germination index.Population cover,frequency and distance to invasion center were all not significant-ly related to seed germination speed.Overall,the evolutionary patterns of seed size and germination traits of M.micrantha populations during range expansion on Hainan Island were not obvious.

关 键 词：扩散 密度 萌发 植物入侵 种子大小 

分 类 号：Q948[生物学—植物学]