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Discovery of the genus Pseudoroegneria (Triticeae, Poaceae) in the Western Mediterranean on exploring the generic boundaries of Elymus
Author(s) -
Lucía Víctor,
MartínezOrtega M. Montserrat,
Rico Enrique,
AnamthawatJónsson Kesara
Publication year - 2019
Publication title -
journal of systematics and evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.249
H-Index - 46
eISSN - 1759-6831
pISSN - 1674-4918
DOI - 10.1111/jse.12426
Subject(s) - elymus , triticeae , biology , botany , genus , repens , leymus , poaceae , ecology , genome , genetics , gene , grassland
In this study, we review the classification of two species, Elymus hispanicus and E. marginatus , which are restricted to highly valuable and sensitive Mediterranean ecosystems. The genomic composition of the two species is analysed by in situ hybridization. In addition, lodicule morphology and foliar anatomy of both species are compared with those of E. caninus , E. repens , E. sibiricus (i.e., the type species of Elymus s.s.) and Pseudoroegneria strigosa (i.e., the type species of Pseudoroegneria ). The genomic formula 2 n = 8 x = 56; HStStSt is proposed for E. hispanicus and 2 n = 4 x = 28; StSt for E. marginatus . In this latter species, the absence of the ribosomal genes in one of the two St genomes suggests that diploidization may have occurred during the evolution of the species. Regarding foliar anatomy, E. hispanicus , E. caninus , E. repens , and E. sibiricus shared several characteristics, but the leaf blades of E. marginatus proved anatomically more similar to those of Ps. strigosa . The data compiled support the contention that: (i) E. hispanicus belongs to Elymus s.s.; (ii) E. marginatus should be transferred to Pseudoroegneria ; and (iii) the morphology of the lodicules should be carefully reconsidered for appropriately describing the boundaries between Elymus s.s. and Pseudoroegneria . The new combination Ps. marginata is proposed and a detailed iconography of the plant is provided.