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Photosynthesis and Growth of Pennisetum centrasiaticum (C4) is Superior to Calamagrostis pseudophragmites (C3) During Drought and Recovery.
Plants ( IF 4.658 ) Pub Date : 2020-08-04 , DOI: 10.3390/plants9080991
Yayong Luo 1, 2 , Xueyong Zhao 1 , Ginger R H Allington 3 , Lilong Wang 1 , Wenda Huang 1, 2 , Rui Zhang 1 , Yongqing Luo 1 , Zhuwen Xu 4
Affiliation  

Global warming and changes in rainfall patterns may put many ecosystems at risk of drought. These stressors could be particularly destructive in arid systems where species are already water-limited. Understanding plant responses in terms of photosynthesis and growth to drought and rewatering is essential for predicting ecosystem-level responses to climate change. Different drought responses of C3 and C4 species could have important ecological implications affecting interspecific competition and distribution of plant communities in the future. For this study, C4 plant Pennisetum centrasiaticum and C3 plant Calamagrostis pseudophragmites were subjected to progressive drought and subsequent rewatering in order to better understand their differential responses to regional climate changes. We tracked responses in gas exchange, chlorophyll fluorescence, biomass as well as soil water status in order to investigate the ecophysiological responses of these two plant functional types. Similar patterns of photosynthetic regulations were observed during drought and rewatering for both psammophytes. They experienced stomatal restriction and nonstomatal restriction successively during drought. Photosynthetic performance recovered to the levels in well-watered plants after rewatering for 6–8 days. The C4 plant, P. centrasiaticum, exhibited the classic CO2-concentrating mechanism and more efficient thermal dissipation in the leaves, which confers more efficient CO2 assimilation and water use efficiency, alleviating drought stress, maintaining their photosynthetic advantage until water deficits became severe and quicker recovery after rewatering. In addition, P. centrasiaticum can allocate a greater proportion of root biomass in case of adequate water supply and a greater proportion of above-ground biomass in case of drought stress. This physiological adaptability and morphological adjustment underline the capacity of C4 plant P. centrasiaticum to withstand drought more efficiently and recover upon rewatering more quickly than C. pseudophragmites and dominate in the Horqin Sandy Land.

中文翻译:

在干旱和恢复过程中,Penensetum centrasiaticum(C4)的光合作用和生长优于Calamagrostis pseudophragmites(C3)。

全球变暖和降雨方式的变化可能会使许多生态系统面临干旱的风险。这些压力因素在干旱系统中尤其有害,在干旱系统中物种已经受到水的限制。了解植物在光合作用和生长对干旱和补水方面的反应对于预测生态系统对气候变化的反应至关重要。C3和C4物种对干旱的不同响应可能会对未来的种间竞争和植物群落的分布产生重要的生态影响。对于本研究,C 4植物Penensetum centrasiaticum和C 3植物Calamagrostis pseudophragmites为了更好地了解他们对区域气候变化的不同反应,他们遭受了不断的干旱和随后的补水。我们跟踪了气体交换,叶绿素荧光,生物量以及土壤水分状况中的响应,以研究这两种植物功能类型的生态生理响应。在两个沙生植物的干旱和复水过程中都观察到了类似的光合作用规律。他们在干旱期间先后经历了气孔限制和非气孔限制。再浇水6–8天后,光合性能恢复到水分充足的植物中的水平。C4植物P. centrasiaticum展示了经典的CO 2-浓缩机制和更有效的叶片散热,赋予植物更有效的CO 2同化和水分利用效率,减轻干旱胁迫,保持其光合优势,直至水分亏缺严重,复水后恢复更快。此外,在供水充足的情况下,百日草可以分配更多比例的根系生物量,而在干旱胁迫下可以分配更多比例的地上生物量。这种生理适应性和形态调节强调了C 4植物百日草比拟草更有效地抵抗干旱和在补水时恢复的能力 并在科尔沁沙地占主导地位。
更新日期:2020-08-04
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