Journal
PLANT CELL AND ENVIRONMENT
Volume 45, Issue 4, Pages 1187-1203Publisher
WILEY
DOI: 10.1111/pce.14254
Keywords
hydraulic failure; intraspecies; mortality; NSC; threshold
Categories
Funding
- National Natural Science Foundation of China [31760111]
- Natural Science Talent Funding of Guizhou University [202132]
Ask authors/readers for more resources
This study investigated the drought tolerance and recovery process of Schima superba seedlings through a water manipulation experiment. The results showed differences in gas exchange recovery and stem hydraulics among different provenances.
Drought-induced tree mortality may increase with ongoing climate change. Unraveling the links between stem hydraulics and mortality thresholds, and the effects of intraspecific variation, remain important unresolved issues. We conducted a water manipulation experiment in a rain-out shelter, using four provenances of Schima superba originating from a gradient of annual precipitation (1124-1796 mm) and temperature (16.4-22.4 degrees C). Seedlings were droughted to three levels of percentage loss of hydraulic conductivity (i.e., P-50, P-88 and P-99) and subsequently rewatered to field capacity for 30 days; traits related to water and carbon relations were measured. The lethal water potential associated with incipient mortality was between P-50 and P-88. Seedlings exhibited similar drought responses in xylem water potential, hydraulic conductivity and gas exchange. Upon rehydration, patterns of gas exchange differed among provenances but were not related to the climate at the origin. The four provenances exhibited a similar degree of stem hydraulic recovery, which was correlated with the magnitude of antecedent drought and stem soluble sugar at the end of the drought. Results suggest that there were intraspecific differences in the capacity of S. superba seedlings for carbon assimilation during recovery, indicating a decoupling between gas exchange recovery and stem hydraulics across provenances.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available