Discovery of the genus Pseudoroegneria (Triticeae, Poaceae)in the Western Mediterranean on exploring the generic boundaries of Elymus  

作　　者：Victor Lucia M.Montserrat Martinez-Ortega Enrique Rico Kesara Anamthawat-Jonsson 

机构地区：[1]Departamento de Botanica y Fisiologia Vegetal,Facultad de Farmacia,Campus Miguel de Unamuno,Universidad de Salamanca,E-37007 Salamanca,Spain [2]Biobanco de ADN Vegetal,Fdificio Multiusos 1+D+i,Calle Espejo s/n,E-37007 Salamanca,Spain [3]Institute of Life and Environmental Sciences,University of Iceland,Askja,Sturlugata 7,Reykjavik 101,Iceland

出　　处：《Journal of Systematics and Evolution》2019年第1期23-41,共19页植物分类学报（英文版）

摘　　要：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,Iodicule 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 2n =8x =56;HStStSt is proposed for E.hispanicus and 2n =4x =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 complied 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 Iodicules 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.

关 键 词：FOLIAR anatomy genomic CONSTITUTION In situ hybridization lodicule morphology Western Mediterranean flora. 

分 类 号：Q[生物学]