Soil-borne cereal mosaic virus (SBCMV) in Italy was first detected in the Po Valley in 1960, and is now known be widespread throughout most of the country, particularly in the northern and central regions. Thirty-four durum wheat cultivars were grown during 2006/07 in a field with SBCMV at Cadriano, near Bologna, and evaluated for resistance to SBCMV on the basis of symptom severity, DAS-ELISA readings and agronomic performance. Seventeen of these cultivars had never been tested for SBCMV resistance before. The cultivars, planted November 6 (2006), were grown in 10 m2 solid-seeded plots, distributed in the field according to a randomized block design with three replicates. Symptom severity was evaluated on two dates using a 0-4 scale. DAS-ELISA was performed on extracts from a bulk of the apical half of the second and third youngest leaves of 10 randomly chosen plants / plot collected February 21 and March 12 (2007). Cultivar Saragolla remained symptomless throughout the entire season, showed the 2nd lowest mean ELISA value, and produced the highest grain yields. Cultivars Dylan, Dario and Hathor too had relatively low mean ELISA values (≤ 0.389) and very low symptom scores (≤ 0.4); the latter two cultivars, however, produced decidedly low yields - as did other relatively SBCMV-resistant wheats (i.e. Orfeo, Catervo and K26) - possibly due to adverse factors different from SBCMV. In cultivars Meridiano and Neodur mild symptoms and high grain yields were accompanied by high ELISA values; this was not expected in that foliar extracts from these two cultivars had given ELISA values close to zero - even under severe disease pressure - in nine previous experiments carried out at a different site near Bologna. Cultivars Duilio and Iride, showing mild symptoms and previously classified as moderately resistant, also showed unexpectedly high ELISA values. The correlation between mean ELISA value and mean symptom score was highly significant (0.772**), and the same was found for the correlations between mean symptom score and heading date (0.504**), plant height (-0.704**), thousand-kernel weight (-0.614**) and grain yield (-0.719). Regression analysis indicated that the effects of SBCMV on grain yield, kernel weight, plant height and heading date were ruinous on the most susceptible cultivars
Reaction of thirty-four durum wheat cultivars to Soil-borne Cereal Mosaic Virus / Rubies Autonell C.; C. Ratti; L. Bianchi; A. Sarti; R. Canestrale; V. Vallega. - STAMPA. - (2008), pp. 50-50. (Intervento presentato al convegno Seven Symposium of IWGPVFV tenutosi a Quedlinburg nel 1-4 September 2008).
Reaction of thirty-four durum wheat cultivars to Soil-borne Cereal Mosaic Virus.
RUBIES AUTONELL, CONCEPCION;RATTI, CLAUDIO;BIANCHI, LAURA;
2008
Abstract
Soil-borne cereal mosaic virus (SBCMV) in Italy was first detected in the Po Valley in 1960, and is now known be widespread throughout most of the country, particularly in the northern and central regions. Thirty-four durum wheat cultivars were grown during 2006/07 in a field with SBCMV at Cadriano, near Bologna, and evaluated for resistance to SBCMV on the basis of symptom severity, DAS-ELISA readings and agronomic performance. Seventeen of these cultivars had never been tested for SBCMV resistance before. The cultivars, planted November 6 (2006), were grown in 10 m2 solid-seeded plots, distributed in the field according to a randomized block design with three replicates. Symptom severity was evaluated on two dates using a 0-4 scale. DAS-ELISA was performed on extracts from a bulk of the apical half of the second and third youngest leaves of 10 randomly chosen plants / plot collected February 21 and March 12 (2007). Cultivar Saragolla remained symptomless throughout the entire season, showed the 2nd lowest mean ELISA value, and produced the highest grain yields. Cultivars Dylan, Dario and Hathor too had relatively low mean ELISA values (≤ 0.389) and very low symptom scores (≤ 0.4); the latter two cultivars, however, produced decidedly low yields - as did other relatively SBCMV-resistant wheats (i.e. Orfeo, Catervo and K26) - possibly due to adverse factors different from SBCMV. In cultivars Meridiano and Neodur mild symptoms and high grain yields were accompanied by high ELISA values; this was not expected in that foliar extracts from these two cultivars had given ELISA values close to zero - even under severe disease pressure - in nine previous experiments carried out at a different site near Bologna. Cultivars Duilio and Iride, showing mild symptoms and previously classified as moderately resistant, also showed unexpectedly high ELISA values. The correlation between mean ELISA value and mean symptom score was highly significant (0.772**), and the same was found for the correlations between mean symptom score and heading date (0.504**), plant height (-0.704**), thousand-kernel weight (-0.614**) and grain yield (-0.719). Regression analysis indicated that the effects of SBCMV on grain yield, kernel weight, plant height and heading date were ruinous on the most susceptible cultivarsI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
