SEED BORNE MYCOFLORA OF CASTOR BEAN (RICINUS COMMUNIS L.) FROM PAKISTAN

摘要

Ascochyta blight disease, caused by the fungus Ascochyta rabiei, is a major yield limiting factor of chickpea in Turkeyand around the world. This study was conducted to identify sources of genetic resistance against chickpea blight caused byAscochyta rabiei. For this purpose, 68 chickpea land races of different origins were evaluated in both field and growthchamber conditions during 2008-2009 growing seassons. Two standard cultivars were used as a reference, Inci (resistant)and Canitez (susceptible). Disease severity scoring was conducted on a 1–9 rating scale 21 days after inoculation in growthchamber test and at flowering and pot filling stages in field tests. Analysis of variance (ANOVA) test showed a significantdifference among the chickpea landraces in ascochyta blight resistance at p0.05. None of the chickpea land races washighly resistant to the pathogen in growth chamber and field conditions. Only two landraces (10A and 28B) were moderatelyresistant to the disease. Some of the landraces resulted in a particular plant to exhibit no disease symptoms, indicating thatthe variation within chickpea land races was high. Therefore, seeds of this plant were harvested separately and preserved forfurther evaluations.