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Stem photosynthesis: new evidence highlights the contribution of phenotypic plasticity to the invasion success of Mikania micrantha
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  • Jin Zheng,
  • Tai-Jie Zhang,
  • Bo-Hui Li,
  • Wei-Jie Liang,
  • Qi-Lei Zhang,
  • Min-Ling Cai,
  • Changlian Peng
Tai-Jie Zhang
Institute of Plant Protection, Guangdong Academy of Agricultural Sciences
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Bo-Hui Li
South China Normal University
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Wei-Jie Liang
South China Normal University
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Qi-Lei Zhang
South China Normal University
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Min-Ling Cai
South China Normal University
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Changlian Peng
South China Normal University
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Abstract

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 a pot experiment involving defoliation treatments and an isolated culture experiment to determine whether the invasive species Mikania micrantha exhibits greater plasticity in the stems than do three native 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 M. micrantha exhibited higher plasticity in terms of either net or gross photosynthesis in response to the defoliation treatment. These effects were positively related to an increased stem elongation rate. The enhancement of stem photosynthesis in M. micrantha resulted from the comprehensive action involving increases in the Chl a/b 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 M. micrantha 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.

Peer review status:POSTED

21 Nov 2020Submitted to Plant, Cell & Environment
21 Nov 2020Assigned to Editor
21 Nov 2020Submission Checks Completed