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Secretory structures in the Plumbaginaceae: origin, evolution and roles in stress tolerance
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  • Ana Caperta,
  • Ana Róis,
  • Generosa Teixeira,
  • Pedro Garcia-Caparros,
  • Tim J. Flowers
Ana Caperta
Universidade de Lisboa
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Ana Róis
Universidade Lusófona de Humanidades e Tecnologias
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Generosa Teixeira
Universidade de Lisboa
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Pedro Garcia-Caparros
University of Almeria
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Tim J. Flowers
University of Sussex
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Abstract

The Plumbaginaceae (non-core Caryophyllales) is a family well known for species adapted to a wide range of arid and saline habitats. Of its salt-tolerant species, at least 45 are in the genus Limonium; two in each of Aegialitis, Limoniastum and Myriolimon, and one each in Psylliostachys, Armeria, Ceratostigma, Goniolimon and Plumbago. All the halophytic members of the family have salt glands and salt glands are also common in the closely related Tamaricaceae and Frankeniaceae. The halophytic species of the three families can secrete a range of ions (Na+, K+, Ca2+, Mg2+, Cl-, HCO3-, SO42) and other elements (As, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn). Salt glands are, however, absent in salt-tolerant members of the sister family Polygonaceae. We describe the structure of the salt glands in the three families and consider whether glands might have arisen as a means to avoid the toxicity of Na+ and/or Cl- or to regulate Ca2+ concentrations with the leaves. We conclude that the establishment of lineages with salt glands took place after the split between the Polygonaceae and its sister group the Plumbaginaceae.

Peer review status:UNDER REVIEW

10 Mar 2020Submitted to Plant, Cell & Environment
10 Mar 2020Submission Checks Completed
10 Mar 2020Assigned to Editor
11 Mar 2020Reviewer(s) Assigned
16 Mar 2020Review(s) Completed, Editorial Evaluation Pending
20 Apr 20201st Revision Received
28 Apr 2020Submission Checks Completed
28 Apr 2020Assigned to Editor
29 Apr 2020Review(s) Completed, Editorial Evaluation Pending
21 May 20202nd Revision Received
22 May 2020Submission Checks Completed
22 May 2020Assigned to Editor
22 May 2020Review(s) Completed, Editorial Evaluation Pending