Polyploidization-enhanced effective clonal reproduction endows the successful invasion of Solidago canadensis

Clonality and ploidy levels are positively associated with plant invasiveness. However, there is still no consensus on whether polyploidization can promote the invasion of alien plants by enhancing clonality. Our recent long-term community succession study found that the more vigorous clone of introduced polyploid Solidago canadensis succeeded into mono-dominant community, which seems to be a positive correlationship between polyploidization and clonal reproduction. However, how polyploidization improves the clonal reproduction of S. canadensis remains unknown. Here, we compared clonal growth ability among diploids and polyploids of S. canadensis from native and introduced ranges in a common garden. Results showed that the rhizomes of S. canadensis originated from axillary buds of dense nodes at the basal stem of seedling and then produced into clonal ramets. Diploids had denser nodes and more buds, developed more rhizomes per unit mass and produced more clonal propagules at the early g...

克隆性与倍性水平与植物入侵性呈正相关。然而，关于多倍化是否可通过增强克隆性来促进外来植物入侵，学界尚未达成共识。我们近期开展的长期群落演替研究发现，引入的多倍体加拿大一枝黄花（Solidago canadensis）的更具活力的克隆成功占据了单优群落，这似乎表明多倍化与克隆繁殖之间存在正相关关系。然而，多倍化如何提升加拿大一枝黄花的克隆繁殖能力仍未明确。本研究通过同质园（common garden）实验，比较了原产与入侵分布范围内加拿大一枝黄花二倍体与多倍体的克隆生长能力。研究结果显示，加拿大一枝黄花的根状茎起源于幼苗茎基部密集节位的腋芽，进而发育为克隆分株。二倍体具有更密集的节位与更多的芽，单位质量可形成更多根状茎，并在早期阶段产生更多的克隆繁殖体……