Physiological and molecular evidence of differential short-term heat tolerance in Mediterranean seagrasses.

摘要: The increase in extreme heat events associated to global warming threatens seagrass ecosystems, likely by affecting key plant physiological processes such as photosynthesis and respiration. Understanding species' ability acclimate is crucial better predict their future trends. Here, we study tolerance two Mediterranean seagrasses, Posidonia oceanica Cymodocea nodosa. Stress responses of shallow deep plants were followed during after short-term exposure mesocosms coupling photo-physiological measures with analysis expression stress-related genes. Contrasting capacity acclimation shown P. ecotypes. While acclimated through respiratory homeostasis activation photo-protective mechanisms, ones experienced photosynthetic injury impaired carbon balance. This suggests that ecotypes are thermally adapted local conditions will diversely affect meadow stands. On the other hand, contrasting mechanisms heat-acclimation adopted species. regulates respiration at level control while C. nodosa balances both enhanced rates. These discrepancies discussed relation inherent attributes