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
朱彬 1黄乔乔2
作者信息
- 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;海南大学植物保护学院,海口 570228
- 2. 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
- 折叠
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.
Abstract
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Key words
spread/density/germination/plant invasion/seed size引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据