Secretory Structures in Plants: Lessons from the Plumbaginaceae on Their Origin, Evolution and Roles in Stress Tolerance
Received: 10 March 2020 Revised: 21 May 2020 Accepted: 29 May 2020 DOI: 10.1111/pce.13825 SPECIAL ISSUE Secretory structures in plants: lessons from the Plumbaginaceae on their origin, evolution and roles in stress tolerance Ana D. Caperta1 | Ana S. Róis1,2 | Generosa Teixeira3,4 | Pedro Garcia-Caparros5 | Timothy J. Flowers6 1Linking Landscape, Environment, Agriculture and Food (LEAF), Instituto Superior de Abstract Agronomia (ISA), Universidade de Lisboa, The Plumbaginaceae (non-core Caryophyllales) is a family well known for species Lisboa, Portugal adapted to a wide range of arid and saline habitats. Of its salt-tolerant species, at 2School of Psychology and Life Sciences, Universidade Lusófona de Humanidades e least 45 are in the genus Limonium; two in each of Aegialitis, Limoniastrum and Tecnologias (ULHT), Lisboa, Portugal Myriolimon, and one each in Psylliostachys, Armeria, Ceratostigma, Goniolimon and 3Centre for Ecology, Evolution and Environmental Changes (CE3C), Faculdade de Plumbago. All the halophytic members of the family have salt glands, which are also Ciências, Universidade de Lisboa, Lisboa, common in the closely related Tamaricaceae and Frankeniaceae. The halophytic spe- Portugal cies of the three families can secrete a range of ions (Na+,K+,Ca2+,Mg2+,Cl−, 4Faculdade de Farmácia, Universidade de − 2- Lisboa, Lisboa, Portugal HCO3 ,SO4 ) and other elements (As, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn). Salt glands 5Agronomy Department of Superior are, however, absent in salt-tolerant members of the sister family Polygonaceae. We School Engineering, University of Almeria, describe the structure of the salt glands in the three families and consider whether CIAIMBITAL, Agrifood Campus of − International Excellence ceiA3, Almería, Spain glands might have arisen as a means to avoid the toxicity of Na+ and/or Cl or to reg- 6 School of Life Sciences, University of Sussex, ulate Ca2+ concentrations within the leaves.
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