Two physiological pathways drive plant mortality during severe drought
In short: Researchers developed a hydraulic-based theory to explain why some plants survive drought while others perish. The model suggests that mortality often stems from two distinct processes: carbon starvation, caused by closing pores to save water, and hydraulic failure, which occurs when water columns within the plant break under tension.
The theory shows that plants regulating water status strictly (isohydric) risk starving for carbon, while those that allow water levels to drop (anisohydric) risk hydraulic collapse. This framework also considers how rising temperatures and insects can worsen these stresses.
The study used a theoretical model incorporating carbon balance and insect resistance. Because it is a theoretical framework, it provides a basis for future predictions rather than direct observations of specific mortality events.
Why it matters: Understanding these hydraulic trade-offs is essential for predicting forest vulnerability to a warming climate.
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Sources
- Source: Research: McDowell et al. (2008). Mechanisms of plant survival and mortality during drought: why do some plants survive while others succumb to drought?. New Phytologist. · other-oa
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