Phytoparasitica (2001) 29, 245-246

From Pestinfo-Wiki
Jump to: navigation, search

Judith Lichtenzveig, S. Abbo and D. Shtienberg (2001)
Ascochyta blight resistance in chickpea is controlled by one major gene
Phytoparasitica 29 (3), 245-246
22nd Congress of the Israeli Phytopathological Society, February 12-13, 2001, Bet Dagan, Israel, lecture
Abstract: Ascochyta blight, caused by the pathogenic fungus Didymella rabiei, is the most devastating and widespread disease of chickpea in Israel. The fungus attacks all the aerial parts of the plant and a severe ascochyta blight epidemic may result in total loss of the yield. The most effective way to manage the disease is to use resistant cultivars. There are varieties, like the Israeli cv. 'Bulgarit', with a high level of field resistance, and varieties with partial field resistance, such as cv. 'Hadas'. Controversial conclusions were published concerning the inheritance of chickpea resistance to D. rabiei. In our opinion the reason for the controversy is that those studies, without exception, were based on analyses of variances of non-parametric scales. The objective of this project was to study the chickpea resistance to D. rabiei while using quantitative tools. In this work, two reciprocal F3 and F4 populations were used; the populations originated from a cross between the partially resistant cv. Hadas and the Ethiopian susceptible line ICC5810. The populations and parental lines were tested in the field under either natural infection or artificial infection with local isolates. Disease severity (percent of infected leaf area) was scored for each plant several times during the season and the data were used to calculate the area under the disease progress curve (AUDPC) for each plant. For all the populations, the phenotype distribution was significantly different from a normal distribution. The heritability values were around 0.7 for the F3 populations and around 0.6 for the F4 populations. The sibling segregation, for all populations, showed that one major gene and a number of minor genes control the chickpea response to D. rabiei.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Shahal Abbo, D. Shtienberg

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Ascochyta rabiei Chickpea (Cicer arietinum) Israel