National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The use of resistant cultivars is the most economical and effective method to control late leaf spot (Phaeoisariopsis personata) in groundnut. In the process of breeding for host plant resistance, the plant material is evaluated in the hot spot location under field conditions. But this process of evaluating the whole crop cycle demands lot of labour and time, the disease expression fluctuates with environmental conditions. Here, we present the improved detached leaf assay method for screening groundnut lines under controlled conditions. Three genotypes of groundnut viz., GPBD 4, ICGV 13193 and TMV 2 were screened against late leaf spot. Based on visual observation of incubation period, percentage of leaf area damaged, lesion diameter, latent period and defoliation percentage were recorded. The varieties GPBD 4 and TMV 2 consistently showed lowest and highest disease intensities, respectively. While the introgression line ICGV 13193 showed moderate resistance. This methodology may allow the detection of sources of resistance that specifically involve one or more components of resistance for defence mechanisms against LLS. When combined with field assessment, this methodology should also enable to quantitatively assess the relative role of each components of resistance to LLS. Therefore, detached leaf assay can be used to screen groundnut genotypes against late leaf spot.
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