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Idioblasts and peltate hairs as distribution networks for water absorbed by the leaves of Capparis odoratissima
  • Juan Losada,
  • Miriam Diaz,
  • Noel Holbrook
Juan Losada
CSIC
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Miriam Diaz
Universidad Francisco de Miranda
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Noel Holbrook
Harvard University
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Abstract

Capparis odoratissima is a tree species native to semi-arid environments of the northern coast of South America where low soil water availability coexists with frequent nighttime fog. A previous study showed that water applied to leaf surfaces enhanced leaf hydration, photosynthesis, and growth, but the mechanisms of foliar water uptake are unknown. Here we combine detailed anatomical evaluations with water and dye uptake experiments in the laboratory, and use immunolocalization of pectin and arabinogalactan protein epitopes to characterize water uptake pathways in leaves. Abaxially, the leaves of C. odoratissima are covered with peltate hairs, while the adaxial surfaces are glabrous. Both surfaces are able to absorb condensed water, but the lower surface has higher rates of water uptake. Numerous idioblasts connect the adaxial leaf surface and the abaxial peltate hairs, both of which contain hygroscopic substances such as arabinogalactan proteins and pectins. The highly specialized anatomy of the leaves of C odoratissima fulfills the dual function of minimizing water loss when stomata are closed, while maintaining the ability to absorb liquid water. Cell-wall related hygroscopic compounds in the peltate hairs and idioblasts create a network of microchannels that maintain leaf hydration and promote water uptake.

Peer review status:ACCEPTED

21 Sep 2020Submitted to Plant, Cell & Environment
22 Sep 2020Submission Checks Completed
22 Sep 2020Assigned to Editor
27 Sep 2020Reviewer(s) Assigned
27 Oct 2020Review(s) Completed, Editorial Evaluation Pending
01 Nov 2020Editorial Decision: Revise Minor
11 Nov 20201st Revision Received
11 Nov 2020Submission Checks Completed
11 Nov 2020Assigned to Editor
17 Nov 2020Reviewer(s) Assigned
11 Dec 2020Review(s) Completed, Editorial Evaluation Pending
12 Dec 2020Editorial Decision: Accept