Embolism spread in the primary xylem of Polystichum munitum : implications for water transport during seasonal drought
- School of Forestry and Environmental Studies Yale University New Haven CT 06511 USA
- Pioneer Hi‐Bred International Inc. Woodland CA 95695 USA
- Universidad Central de Venezuela Facultad de Agronomía, Instituto de Botánica Agrícola Maracay 2101 Venezuela
- Department of Ecology and Evolutionary Biology University of California Santa Cruz CA 95064 USA
Abstract Xylem network structure and function have been characterized for many woody plants, but less is known about fern xylem, particularly in species endemic to climates where water is a limiting resource for months at a time. We characterized seasonal variability in soil moisture and frond water status in a common perennial fern in the redwood understory of a costal California, and then investigated the consequences of drought‐induced embolism on vascular function. Seasonal variability in air temperature and soil water content was minimal, and frond water potential declined slowly over the observational period. Our data show that Polystichum munitum was protected from significant drought‐induced hydraulic dysfunction during this growing season because of a combination of cavitation resistant conduits (Air‐seeding threshold (ASP) = −1.53 MPa; xylem pressure inducing 50% loss of hydraulic conductivity ( P 50 ) = −3.02 MPa) and a soil with low moisture variability. High resolution micro‐computed tomography (MicroCT) imaging revealed patterns of embolism formation in vivo for the first time in ferns providing insight into the functional status of the xylem network under drought conditions. Together with stomatal conductance measurements, these data suggest that P . munitum is adapted to tolerate drier conditions than what was observed during the growing season.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- DE‐AC02‐05CH11231
- OSTI ID:
- 1401393
- Journal Information:
- Plant, Cell and Environment, Journal Name: Plant, Cell and Environment Vol. 39 Journal Issue: 2; ISSN 0140-7791
- Publisher:
- Wiley-BlackwellCopyright Statement
- Country of Publication:
- United Kingdom
- Language:
- English
Web of Science
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