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Accueil du site → Doctorat → Royaume-Uni → 1992 → Systematic and ecological studies of Suaeda and Salicornia from Saudi Arabia and Britain

University of East Anglia (1992)

Systematic and ecological studies of Suaeda and Salicornia from Saudi Arabia and Britain

Al-Turki, Turki Ali

Titre : Systematic and ecological studies of Suaeda and Salicornia from Saudi Arabia and Britain.

Auteur : Al-Turki, Turki Ali.

Université de soutenance : University of East Anglia

Grade : Doctor of Philosophy (Ph.D.) : 1992

Résumé
This study involves two halophytic genera of the Chenopodiaceae that range from salt marshes of the Arabian Gulf and Red Sea coasts to inland `sabkah’ and deserts ; comparisons are made with better-known counterparts in British salt marshes. Information on distribution, morphology, chromosome number and ecology will provide a basis for a future taxonomic treatment of Suaeda and Salicornia in Saudi Arabia. Variation was examined in populations of two annuals (Suaeda aegyptiaca and S.maritimia) and four perennials (S.monoica, S. cf. vermiculata, and two undescribed putative species) ; S.maritima and S.vera were collected from Britain. Material from Saudi Arabia was provisionally referred to the Salicornia europaea aggregate. Distinctive characters included kranz leaf anatomy, arrangement of stomatal cells, shape of the leaf tip and base, and the number and arrangement of stigmas. Examination of venation and leaf-surface wax revealed no useful diagnostic characters and no trichomes were observed. Morphometric data were subjected to statistical analysis ; Cluster Analysis suggested affinities among the putative species, while Discriminant Analysis gave generally accurate classifications of individuals into populations and of populations into species. Saudi Arabian populations of Salicornia were distinct from British ones. Suaeda maritima from Saudi Arabia was diploid (2n-18), unlike British material which was tetraploid (2n-36). Suaeda aegyptiaca, S.monoica and Suaeda species no. 1 were all diploid, whereas Suaeda vermiculata was tetraploid. Salicornia from Saudi Arabia was diploid (2n-18), like the S.europaea agg. in Britain

Présentation : EThOS (UK)

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