Journal
NEW PHYTOLOGIST
Volume 229, Issue 3, Pages 1354-1362Publisher
WILEY
DOI: 10.1111/nph.16952
Keywords
abiotic stress; cold tolerance; drought tolerance; polytolerance; shade tolerance; trade-off; waterlogging tolerance; woody plants
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Funding
- European Regional Development Fund
- Estonian Research Council [MOBJD350, PUT1409]
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This study found that trade-offs between different forms of stress, especially shade and drought, constrain the tolerance of woody plants to abiotic stress. By analyzing a database of 799 northern hemisphere woody species, they identified a triangular stress tolerance space (STS) summarizing stress tolerance combinations. Tolerance combinations were limited by boundary-line trade-offs, reconciling major theories about abiotic stress tolerances.
Tolerance of abiotic stress in woody plants is known to be constrained by biological trade-offs between different forms of stress, especially shade and drought. However, there is still considerable uncertainty on the relationship between tolerances and the limits on tolerance combinations. Using the most extensive database available on shade, drought, waterlogging and cold tolerance for 799 northern hemisphere woody species, we determined the number of dimensions needed to summarise their tolerance combinations, and the best trade-off model among those currently available, for description of the interdependence between tolerances. Two principal component analysis (PCA) dimensions summarised stress tolerance combinations. They defined a triangular stress tolerance space (STS). The first STS dimension reflected segregation between drought-tolerant and waterlogging-tolerant species. The second reflected shade tolerance, which is independent of the other tolerances. Cold tolerance scaled weakly with both dimensions. Tolerance combinations across the species in the database were limited by boundary-line trade-offs. The STS reconciles all major theories about trade-offs between abiotic stress tolerances, providing a unified trade-off model and a set of coordinates that can be used to examine how other aspects of plant biology, such as plant functional traits, change within the limits of abiotic stress tolerance.
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