WHOLE-CELL FATTY ACID PROFILES - A TOOL FOR SPECIES AND SUBSPECIES CLASSIFICATION IN THE PUCCINIA RECONDITA COMPLEX

I.S. Ben-Ze’ev, E. Levy, T. Eilam, Y. Anikster

Abstract


The fatty acid profiles of 145 telial isolates of Puccinia recondita sensu lato (Uredinales: Pucciniaceae), from different host species and different geographical origins, were determined by gas chromatography (GC). The isolates clustered into three different GC groups, according to consistent quantitative differences in their fatty acid compositions. Isolates collected from bread, durum and wild emmer wheats, with Thalictrum speciosissimum (Ranunculaceae) as aecial host, regardless of their geographical origin, formed one group. The second group consists of isolates collected on Aegilops spp. and some from durum wheat, all alternating on Boraginaceous species. The third group contains isolates collected on rye, alternating on Boraginaceae. The grouping of P. recondita isolates by fatty acid profiles coincides with a similar one, suggested by several studies involving pathogenicity on alternate hosts, cross ability, teliospore dimensions and relative DNA content of haploid spores. It is concluded that the three groups represent two species and one subspecies: Puccinia triticina (on wheats, group 1), P. recondita subsp. recondita (on rye, group 3) and P. recondita subsp. aegilopis (on Aegilops spp. and durum wheat, group 2).

Keywords


Aegilops; leaf rust; Puccinia triticina; rye; wheat

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DOI: http://dx.doi.org/10.4454/jpp.v87i3.917

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