AI Article Synopsis
- Drought significantly impacts Mediterranean ecosystems, affecting tree growth and vulnerability to fires, making it essential to study how trees manage water use efficiently in low water conditions.
- Research focused on Pinus pinaster revealed genetic variation in intrinsic water use efficiency (WUE(i)), with some tree clones showing better adaptability to drought conditions.
- Stomatal conductance and specific leaf area were found to be critical traits influencing WUE(i), and breeding for needles with low specific leaf area could enhance water efficiency in these trees.
Article Abstract
Drought is an important environmental factor in Mediterranean ecosystems affecting seedling recruitment, productivity or susceptibility to fires and pathogens. Studying water use efficiency in these environments is crucial due to its adaptive value allowing trees to cope with low water availability. We studied the phenotypic variability and genetic control of intrinsic water use efficiency (WUE(i)) and related traits in a full-sib family of Pinus pinaster under drought imposition. We detected significant differences in WUE(i) between clones of the same family and moderate heritability estimates that indicate some degree of genetic control over this trait. Stomatal conductance to water vapor was the trait most affected by drought imposition and it showed the strongest influence in WUE(i). Stomatal conductance to water vapor and specific leaf area (SLA) were the traits with highest heritabilities and they showed a significant genetic correlation with WUE(i), suggesting that selection of needles with low SLA values will improve WUE(i) in this species by reducing water losses through stomatal control.
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| http://dx.doi.org/10.1093/treephys/tpr122 | DOI Listing |
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