دراسة بيولوجية و مورفولوجية لنيماتودا تثألل الحبوب (Anguina tritici Steinb.)‎ معزولة من القمح و الشعير في سورية

الملخص EN

The study was conducted during 1996/97 growing season to determine the host range of seed-gall nematode Anguina tritici isolated from infected wheat and barley, and to study the effect of temperature on the viability of second-stage juveniles and some morphological and morphomitric studies.

Forty-four genetic resources are used including bread and durum wheat, wild wheat relatives/progenitors (Aegilops and Triticum spp.), Triticale, two and six-rows cultivated barley, as well as wild barley (Hordeum spontaneum C.

Koch).

Results showed that population of seed-gall nematode isolated from barley can infect only Hordeum vulgare L.

and H.

spontaneum, whereas that from wheat can infect Triticum aestivum L., T.

durum Desf., Triticale, and to a lesser extent T.

boeoticum Boiss., T.

dicocoides (Kornicke) Aar.

and.

Aegilops crassa Boiss..

However, the two accessions of wild relatives’ T.

boeoticum 600742 and T.

dicoccoides 600679 were resistant to both nematode populations.

Infection incidence varied for barley-population of seed-gall nematode on barley from 6.8 % H.

spontaneum (local variety) to 20.1% (cv.

Furat –1) and for wheat-population on wheat from 7.5% (cv.

Cham-4) to 53.7% (cv.

Bohouth-6).

Results also confirmed that the second-stage juveniles of both nematodes to survive actively up to 6-8 weeks under different temperature regimes.

Morphological and morphometric studies showed that seed-gall nematodes from barley and wheat were approximately similar, and could be most probably considered as two specific pathotypes of the seed gall nematode, Anguina tritici.