Zheng Jin, Zhang Tai-Jie, Li Bo-Hui, Liang Wei-Jie, Zhang Qi-Lei, Cai Min-Ling, Peng Chang-Lian
Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, Guangzhou Key Laboratory of Subtropical Biodiversity and Biomonitoring, School of Life Sciences, South China Normal University, Guangzhou, China.
Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Institute of Plant Protection, Guangdong Academy of Agricultural Sciences, Guangzhou, China.
Front Plant Sci. 2021 May 5;12:638796. doi: 10.3389/fpls.2021.638796. eCollection 2021.
Phenotypic plasticity affords invasive plant species the ability to colonize a wide range of habitats, but physiological plasticity of their stems is seldom recognized. Investigation of the stem plasticity of invasive plant species could lead to a better understanding of their invasiveness. We performed pot experiments involving defoliation treatments and isolated culture experiments to determine whether the invasive species exhibits greater plasticity in the stems than do three non-invasive species that co-occur in southern China and then explored the mechanism underlying the modification of its stem photosynthesis. Our results showed that the stems of exhibited higher plasticity in terms of either net or gross photosynthetic rate in response to the defoliation treatment. These effects were positively related to an increased stem elongation rate. The enhancement of stem photosynthesis in resulted from the comprehensive action involving increases in the Chl / ratio, D1 protein and stomatal aperture, changes in chloroplast morphology and a decrease in anthocyanins. Increased plasticity of stem photosynthesis may improve the survival of under harsh conditions and allow it to rapidly recover from defoliation injuries. Our results highlight that phenotypic plasticity promotes the invasion success of alien plant invaders.
表型可塑性使入侵植物物种能够在广泛的栖息地中定殖，但它们茎的生理可塑性却很少得到认可。对入侵植物物种茎可塑性的研究有助于更好地理解其入侵性。我们进行了涉及去叶处理的盆栽实验和离体培养实验，以确定该入侵物种的茎是否比在中国南方共生的三种非入侵物种表现出更大的可塑性，然后探究其茎光合作用改变的潜在机制。我们的结果表明，在去叶处理下，该入侵物种的茎在净光合速率或总光合速率方面表现出更高的可塑性。这些效应与茎伸长率的增加呈正相关。该入侵物种茎光合作用的增强是由叶绿素/比值、D1蛋白和气孔孔径增加、叶绿体形态变化以及花青素减少等综合作用导致的。茎光合作用可塑性的增加可能会提高该入侵物种在恶劣条件下的存活率，并使其能够从去叶损伤中迅速恢复。我们的结果突出表明，表型可塑性促进了外来植物入侵者的入侵成功。
