Virulence spectrum to barley (Hordeum vulgare L.) in some isolates of Cochliobolus sativus from Syria
2002
Arabi, M.I.E. | Jawhar, M. (Atomic Energy Commission of Syria, Damascus. Dept. of Molecular Biology and Biotechnology)
إنجليزي. Isolates of Cochliobolus sativus (Ito and Kurib) Drechsl. ex Dast. (anamorph, Bipolaris sorokiniana (Sacc. in Sorok.)) that cause common root rot (CRR) symptoms on barley (Hordeum vulgare L.) were collected in 1998 and 1999 from fields in different regions of Syria. Their virulence spectra were determined using 11 barley cultivars. Cultivars exhibited a continuous range of response from very susceptible to moderately resistant, but none was immune from the disease. A cluster analysis indicated that the isolates exhibited distinct differential virulence patterns with three groups. Mean disease rating of 4.37 was the separation point between avirulent and virulent reactions. Isolate CRR16 had the highest mean virulence with lowest variance across all cultivars; and thus it was proposed to be considered as a physiological race. To incorporate adequate levels of resistance into future barley cultivars, disease evaluations should be made with Cochliobolus sativus isolates that express the full spectrum of virulence found in Syria
اظهر المزيد [+] اقل [-]إيطالي. [Ceppi di Cochliobolus sativus (Ito e Kurib) Drechsl. Ex Dast (anamorfo, Bipolaris sorokiniana (Sacc. in Sorok.)) che causano sull'orzo (Hordeum vulgare L.) sintomi del marciume comune delle radici (CRR) sono stati raccolti nel 1998 e 1999 in diverse regioni della Siria. La loro virulenza e' stata valutata su 11 cultivar di orzo, piu' o meno suscettibili, ma nessuna immune da questa malattia. L'analisi cluster ha consentito di suddividere la virulenza dei ceppi in tre gruppi. Il punteggio medio della malattia di 4,37 rappresentava il punto di separazione fra le reazioni virulente e avirulente. Il ceppo CRR16 presentava il piu' alto grado di virulenza e la minore variazione in tutte le cultivar e si e' quindi proposto di considerarlo una razza fisiologica. Per inserire nelle future varieta' di orzo livelli adeguati di resistenza, dovrebbero essere effettuate valutazioni della malattia con gli isolati di Cochliobolus sativus che esprimono l'intero spetto di virulenza riscontrato in Siria]
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Istituto di Servizi per il Mercato Agricolo Alimentare