Screening of 137 Italian rice varieties for slow-blasting trait
Rice is a major crop in Italy where is grown on about 220.000 ha. Italian paddy accounts for half of the total EU rice production. Blast caused by Pyricularia grisea is the most important rice disease in Italy and many grown varieties are susceptible to it. Actual breeding activity for blast resistance appears not to conduct to long-lasting results. A more stable source of resistance needs to be incorporated in new genotypes. The slow-blasting trait is considered a prerequisite to fight blast but scarce information are available for European varieties. In 2000, 135 italian varieties were tested in Italy for slow-blasting trait through a multi-location experiment consisting in subsequently recording diseased leaf area (DLA) scores to obtain a disease progress curve. Some parameters for slow-blasting evaluation were derived such as the area under disease progress curve (AUDPC) and the last diseased leaf area increase (LDLAI). Varieties were clustered in resistance groups based on these parameters. The more susceptible group was the most filled. Among the blast resistant varieties we found differences in slow-blasting trait and it should be taken into account in breeding activities looking for more stable resistance.
| Main Authors: | , |
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| Format: | conference_item biblioteca |
| Language: | eng |
| Published: |
CIRAD
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| Subjects: | F30 - Génétique et amélioration des plantes, H20 - Maladies des plantes, Pyricularia, maladie des plantes, maladie fongique, résistance aux maladies, essai de variété, http://aims.fao.org/aos/agrovoc/c_16024, http://aims.fao.org/aos/agrovoc/c_5962, http://aims.fao.org/aos/agrovoc/c_11042, http://aims.fao.org/aos/agrovoc/c_2328, http://aims.fao.org/aos/agrovoc/c_26833, http://aims.fao.org/aos/agrovoc/c_4026, |
| Online Access: | http://agritrop.cirad.fr/510274/ |
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