| Autor: |
Saunders, Alta, Drew, David M. |
| Zdroj: |
Trees: Structure & Function; Feb2022, Vol. 36 Issue 1, p139-151, 13p |
| Abstrakt: |
Key message: A high-risk hydraulic strategy might be linked to embolism recovery in Eucalyptus hybrids, allowing plants to have high hydraulic conductivity regardless of safety. Plants use a variety of strategies to mitigate or reduce drought-induced hydraulic failure. Recovery of hydraulic conductivity after drought stress can be an important mechanism used to avoid drought-induced mortality; however, the underlying mechanism of hydraulic recovery is still poorly understood. We examined the hydraulic recovery response between E. grandis × camaldulensis (GC) and E. urophylla × grandis (GU) after drought. We aimed to determine if there is a trade-off between xylem safety and hydraulic recovery and what the underlying mechanism might be. Destructive measurements together with X-ray microtomography measurements were used to determine the extent of hydraulic recovery at various time intervals. We found two distinct hydraulic strategies used by plants. GC was more resistant to embolism formation as compared to UG; however, GC showed lower levels of hydraulic recovery after rewatering. Larger vessel sizes were related to increases in drought vulnerability. Hydraulic recovery was also related to functional traits of cells surrounding vessels, highlighting the possible role that these cells play to increase hydraulic conductance in the xylem and increasing connectivity between vessels. Our study suggest that hydraulic recovery can be an important hydraulic strategy used by Eucalyptus hybrids in response to drought. A high-risk hydraulic strategy might be linked to embolism recovery, allowing plants to have high hydraulic resistance regardless of safety. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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