Chun-Can Si1,2#, Ying Lin1,2#, Misbah Naz3, Shan-Shan Qi4, Zhi-Cong Dai2,5,6*, Dao-Lin Du7*
1Biological and Environmental Engineering, Jingdezhen University, Jingdezhen 333400, China
2Institute of Environment and Ecology, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
3State Key Laboratory of Green Pesticide, Guizhou University, Guiyang, Guizhou 550025, China
4Institute of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China
5Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou University of Science and Technology, Jiangsu, Suzhou 215009, China
6School of the Environment and Safety Engineering, Key Laboratory of Zhenjiang, Jiangsu University, Zhenjiang 212013, China
7Jingjiang College, Jiangsu University, Zhenjiang 212028, China
#These authors contributed equally to this work.
*Corresponding authors: Zhi-Cong Dai (daizhicong@163.com) or Daolin Du (ddl@ujs.edu.cn)
摘要： 与二倍体相比，多倍体表现出独特的生物学特性与入侵策略，这通常赋予它具备更强的入侵潜力。然而，多倍体化对灌木物种入侵能力的影响仍未得到充分探究。本研究以广泛分布于热带与亚热带地区的入侵克隆灌木马缨丹(Lantana camara)为对象，探讨了染色体倍性对其入侵性的作用。因此，本文对海南岛8个马缨丹野外种群进行调查，系统比较二倍体与四倍体植株在生态位宽度、克隆生长模式、形态特征及遗传多样性等方面的差异。进一步通过同质园试验评估了两种细胞型种群对环境波动的形态与生理响应。结果表明，四倍体个体广泛分布于7个种群(占比达85%)，而二倍体个体仅分布于万宁种群(占15%)。与二倍体相比，四倍体表现出：(1)更宽的生态位占据范围；(2)显著更高的遗传多样性；(3)在自然栖息地中具有更多样的生长方式；(4)更高的种子产量；以及(5)在同质园试验条件下具有更强的表型可塑性。这些研究结果表明，多倍化通过增强适应能力和繁殖能力可极大促进马缨丹的入侵成功。总体而言，本研究结果强调了四倍体在促进该热带灌木物种入侵过程中的作用，并突出了细胞型分化对于理解入侵动态的重要性。
