期刊
PLANT CELL AND ENVIRONMENT
卷 38, 期 12, 页码 2652-2661出版社
WILEY
DOI: 10.1111/pce.12581
关键词
hydraulic coordination; hydraulic vulnerability; plant-water relations; safety margin; ultrasonic emissions
资金
- DOC fellowship of the Austrian Academy of Sciences
- Student Research Grant of the Daintree Rainforest Observatory
- Australian Research Council Future Fellowship [FT130101115]
Coordination of stem and leaf hydraulic traits allows terrestrial plants to maintain safe water status under limited water supply. Tropical rain forests, one of the world's most productive biomes, are vulnerable to drought and potentially threatened by increased aridity due to global climate change. However, the relationship of stem and leaf traits within the plant hydraulic continuum remains understudied, particularly in tropical species. We studied within-plant hydraulic coordination between stems and leaves in three tropical lowland rain forest tree species by analyses of hydraulic vulnerability [hydraulic methods and ultrasonic emission (UE) analysis], pressure-volume relations and in situ pre-dawn and midday water potentials (). We found finely coordinated stem and leaf hydraulic features, with a strategy of sacrificing leaves in favour of stems. Fifty percent of hydraulic conductivity (P-50) was lost at -2.1 to -3.1MPa in stems and at -1.7 to -2.2MPa in leaves. UE analysis corresponded to hydraulic measurements. Safety margins (leaf P-50 - stem P-50) were very narrow at -0.4 to -1.4MPa. Pressure-volume analysis and in situ indicated safe water status in stems but risk of hydraulic failure in leaves. Our study shows that stem and leaf hydraulics were finely tuned to avoid embolism formation in the xylem.
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