Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 153, Issue -, Pages 106-118Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2020.05.023
Keywords
Anisohydric; Carbon starvation; Hydraulic failure; Intense drought; Isohydric; Mild drought
Categories
Funding
- National Natural Science Foundation of China [31400173, 31600313]
- Ministry of Science and Technology of the People's Republic of China [2015FY210200-11]
- Research Foundation of Qingdao Forest Ecosystem [11200005071603]
- Natural Science Foundation of Shandong Province, China [ZR2017BCE090]
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Combining hydraulic: and carbon-related measurements can help elucidate drought-induced plant mortality. To study drought mortality mechanisms, seedlings of two woody species, including the anisohydric Robinia pseudoacacia and isohydric Quercus acutissima, were cultivated in a greenhouse and subjected to intense drought by withholding water and mild drought by adding half of the amount of daily water lost. Patterns of leaf and root gas exchange, leaf surface areas, growth, leaf and stem hydraulics, and carbohydrate dynamics were determined in drought-stressed and control seedlings. We detected a complete loss of hydraulic conductivity and partial depletion of total nonstructural carbohydrates contents (TNC) in the dead seedlings. We also found that intense drought triggered a more rapid decrease in plant water potential and a faster drop in net photosynthesis below zero, and a greater TNC loss in dead seedlings than mild drought. Additionally, anisohydric R. pseudoacacia suffered a rapider death than the isohydric Q. acutissima. Based on these findings, we propose that hydraulic conductivity loss and carbon limitation jointly contributed to drought-induced death, while the relative contributions could be altered by drought intensity. We thus believe that it is important to illustrate the mechanistic relationships between stress intensity and carbon-hydraulics coupling in the context of isohydric vs. anisohydric hydraulic strategies.
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