differential responses of stomata and photosynthesis to elevated temperature in two co-occurring subtropical forest tree species

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2018
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Abstract
Global warming could increase leaf transpiration and soil evaporation, which can potentially cause water deficit to plants. As valves, leaf stomata can control plant water loss and carbon gain, particularly under water stress conditions. To investigate the responses of stomata to elevated temperature in Schima superba and Syzygium rehderianum, two co-occurring subtropical forest dominant tree species, functional traits related to gas exchange, stomatal anatomy, and drought resistance were measured under control and warming environment (ca. 2°C higher). We found that leaf water potential at both predawn and midday significantly decreased for the two species grown under warming conditions compared with those grown in the control environment. Warming resulted in significant decrease of stomatal size in S. rehderianum, but had no obvious effect on that of S. superba. By contrast, stomatal density of S. superba significantly decreased under warming conditions, while non-significant change was observed for S. rehderianum. In addition, warming significantly reduced photosynthetic rate, stomatal conductance, and stomatal sensitivity to leaf water potential of S. superba, but had non-significant effects on those of S. rehderianum. Overall, our results demonstrated that, confronting water deficit caused by elevated temperature, the two co-occurring subtropical tree species responded differently through the adjustment of stomatal morphology and photosynthetic function. Consequently, S. rehderianum was able to maintain similar carbon assimilation as under control environment, while S. superba showed a decrease in carbon gain that might bring adverse effect on its dominancy in subtropical forest community under future climate change.
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wu2018frontiersdifferential Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Guilin Wu;Guilin Wu;Hui Liu;Hui Liu;Lei Hua;Lei Hua;Qi Luo;Qi Luo;Yixue Lin;Yixue Lin;Pengcheng He;Pengcheng He;Shiwei Feng;Juxiu Liu;Juxiu Liu;Qing Ye;Qing Ye
Journal phytochemistry letters
Year 2018
DOI
10.3389/fpls.2018.00467
URL
http://journal.frontiersin.org/article/10.3389/fpls.2018.00467/full
Keywords
functional traits warming gas exchange

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