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Phenotypic plasticity and genetic variation in leaf traits of Yushania niitakayamensis (Bambusoideae; Poaceae) in contrasting light environments

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Abstract

Yushania niitakayamensis (Bambusoideae; Poaceae), a perennial grass distributed from mid to high elevations in Taiwan, is often found growing in exposed grassland or shaded forest understories. To answer the question how does Y. niitakayamensis cope with contrasting light availability of habitats, we compared (1) leaf ecophysiological traits between populations of Y. niitakayamensis growing in exposed and shaded habitats in four seasons, and (2) plasticity patterns of transplanted plants to two light treatments (full-sun and 70 % shading) in a phytotron. Significant differences in leaf morphological (leaf length, width, specific leaf area, stomatal density), anatomical (leaf thickness (LT), the frequency of cavity formed by collapsed fusoid cells), and biochemical (chlorophyll contents, nitrogen contents per unit area ([N]area) and stable carbon isotope ratio) features were found between populations across seasons. Common garden experiments suggested that most of the trait variations in field growing plants can be explained by the effect of growth light treatment but not by that of population. However, variations between the two populations in LT, [N]area, gas exchange parameters, and the degree of plasticity in LT and [N]area in responding to growth light regimes might have genetic basis. In comparison between transplants from different origins grown under same light regime, plants from the exposed population grown under full-sun expressed significantly higher LT, [N]area and light-saturated photosynthetic rates, whereas plants from the shaded population grown under shading had significantly higher water use efficiency. Accordingly, local specialization in populations of Y. niitakayamensis to particular environmental conditions might have arisen.

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Acknowledgements

We are grateful to staff of Taroko National Park for giving us permission to work in the national park and staff of High Altitude Experimental Station, Endemic Species Research Institute of Taiwan for providing us workspace and accommodation during field surveys. Our thanks also go to Dr. Zelený D, and Dr. Li C-F for their valuable advice and comments on the experimental design.

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The authors did not receive support from any organization for the submitted work.

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Contributions

K-SW and W-YK conceived the ideas and designed the experiment. K-SW collected field and lab data. K-SW analyzed the data and wrote the initial draft of the manuscript. Both authors contributed critically to manuscript revisions and gave final approval for publication. CRediT authorship contribution statement: Data curation; Formal analysis; Investigation; Writing - original draft; Writing - review & editing; Visualization: [K-SW]. Conceptualization; Methodology; Project administration; Resources; Software; Supervision; Validation; Writing - review & editing: [W-YK]

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Correspondence to Wen-Yuan Kao.

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Wu, KS., Kao, WY. Phenotypic plasticity and genetic variation in leaf traits of Yushania niitakayamensis (Bambusoideae; Poaceae) in contrasting light environments. J Plant Res 134, 1021–1035 (2021). https://doi.org/10.1007/s10265-021-01327-y

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  • DOI: https://doi.org/10.1007/s10265-021-01327-y

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