Abstract
• Motivated by the urgent need to understand how water stress-induced embolism limits the survival and recovery of plants during drought, the linkage between water-stress tolerance and xylem cavitation resistance was examined in one of the world's most drought resistant conifer genera, Callitris. • Four species were subjected to drought treatments of -5, -8 and -10 MPa for a period of 3-4 wk, after which plants were rewatered. Transpiration, basal growth and leaf water potential were monitored during and after drought. • Lethal water potential was correlated with the tension producing a 50% loss of stem hydraulic conductivity. The most resilient species suffered minimal embolism and recovered gas exchange within days of rewatering from -10 MPa, while the most sensitive species suffered major embolism and recovered very slowly. The rate of repair of water transport in the latter case was equal to the rate of basal area growth, indicating xylem reiteration as the primary means of hydraulic repair. • The survival of, and recovery from, water stress in Callitris are accurately predicted by the physiology of the stem water-transport system. As the only apparent means of xylem repair after embolism, basal area growth is a critical part of this equation.
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Claims 6
Claim · model-written summary
Lethal water potential correlated with tension causing 50% stem hydraulic conductivity loss.
- Outcome
- Lethal water potentiale0
- Comparator
- tension producing a 50% loss of stem hydraulic conductivitye0
CallitrisNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lethal water potential was correlated with the tension producing a 50% loss of stem hydraulic conductivity.”
e1“one of the world's most drought resistant conifer genera, Callitris”
Claim · model-written summary
The most resilient species had minimal embolism.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most resilient species suffered minimal embolism”
e2“conifer genera, Callitris”
Claim · model-written summary
The most resilient species recovered gas exchange within days after rewatering from -10 MPa.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“recovered gas exchange within days of rewatering from -10 MPa”
e2“conifer genera, Callitris”
Claim · model-written summary
The most sensitive species had major embolism and very slow recovery.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the most sensitive species suffered major embolism and recovered very slowly”
e2“conifer genera, Callitris”
Claim · model-written summary
In sensitive species water transport repair rate equaled basal area growth rate.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of repair of water transport in the latter case was equal to the rate of basal area growth”
e2“conifer genera, Callitris”
Claim · model-written summary
Stem water transport physiology predicts survival and recovery from water stress.
- Outcome
- survival of, and recovery from, water stresse0
- Qualifier
- physiology of the stem water-transport systeme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The survival of, and recovery from, water stress in Callitris are accurately predicted by the physiology of the stem water-transport system.”