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Is desiccation tolerance and avoidance reflected in xylem and phloem anatomy of two co-existing arid-zone coniferous trees?: Xylem and Phloem Anatomy

Journal Article · · Plant, Cell and Environment
DOI:https://doi.org/10.1111/pce.13198· OSTI ID:1431064
 [1];  [1];  [1];  [2];  [3];  [4];  [5];  [5];  [5]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Swiss Federal Lab. for Material Science and Technology (Empa), Duebendorf (Switzerland)
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source
  4. Swiss Federal Lab. for Material Science and Technology (Empa), Duebendorf (Switzerland); Federal Inst. of Technology, Zurich (Switzerland)
  5. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Biology
Plants close their stomata during drought to avoid excessive water loss, but species differ in respect to the drought severity at which stomata close. The stomatal closure point is related to xylem anatomy and vulnerability to embolism, but it also has implications for phloem transport, and possibly phloem anatomy to allow sugar transport at low water potentials. Desiccation tolerant plants that close their stomata at severe drought should have smaller xylem conduits and/or fewer and smaller inter-conduit pits to reduce vulnerability to embolism, but more phloem tissue and larger phloem conduits compared to plants that avoid desiccation. These anatomical differences could be expected to increase in response to long-term reduction in precipitation. To test these hypotheses we used tridimensional synchroton X-ray microtomograph and light microscope imaging of combined xylem and phloem tissues of two coniferous species: one-seed juniper (Juniperus monosperma) and piñon pine (Pinus edulis) subjected to precipitation manipulation treatments. These species show different xylem vulnerability to embolism, contrasting desiccation tolerance, and stomatal closure points. Our results support the hypothesis that desiccation tolerant plants require higher phloem transport capacity than desiccation avoiding plants, but this can be gained through various anatomical adaptations in addition to changing conduit or tissue size.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
Paul Scherrer Institute; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); University of New Mexico
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1431064
Report Number(s):
LA-UR--17-23770
Journal Information:
Plant, Cell and Environment, Journal Name: Plant, Cell and Environment Journal Issue: 7 Vol. 41; ISSN 0140-7791
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

The foliar characters in Callitris (Callitroideae, Cupressaceae s. str.) and their evolutionary and ecological significance journal February 2019
Drought impacts on tree phloem: from cell-level responses to ecological significance journal February 2019

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