第一作者：

刘艳杰

英文第一作者：

Y. J. Liu

联系作者：

Yu, Fei-Hai

英文联系作者：

Yu, Fei-Hai

发表年度：

2021

摘要：

Subsequent to escape from intense herbivory in the native range, invasive plants are expected to reduce allocation to costly anti-herbivory defences and have greater competitive ability than co-occurring native species. Given that invasive alien plants often occur in open habitats where light is less limited, it is reasonable to hypothesize that invasive plants should express high concentrations of gibberellins that enable them to allocate more biomass to roots, and thus have higher competitive ability than native plants. To test this prediction, we grew five congeneric pairs of invasive alien plants and native plants under two levels of nutrient availability (low versus high) and treated a half of the plants with a gibberellin biosynthesis inhibitor, paclobutrazol. Paclobutrazol significantly decreased aboveground, belowground and total biomass of the test plants. Interestingly, the effects on belowground biomass were significantly stronger for invasive plants than for native plants. A similar pattern was found for total biomass (marginally significant effect p = 0.0592). Additionally, paclobutrazol decreased root mass fraction for invasive plants, but tended to increase it for native plants. Our findings suggest that plant hormones can differently regulate biomass allocation of invasive and native plants, and thus contribute to greater growth of invasive plants compared to native plants.

刊物名称：

Oikos

参与作者：

Y. J. Liu, A. M. O. Oduor, Z. C. Dai, F. L. Gao, J. N. Li, X. Zhang and F. H. Yu