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Development of a sequence-characterized amplified region marker for detection of Ascochyta rabiei causing Ascochyta blight in chickpea

MS. Baite, BK. Upadhyay, SC. Dubey,

. 2020 ; 65 (1) : 103-108. [pub] 20190502

Language English Country United States

Document type Journal Article

Persistent link   https://www.medvik.cz/link/bmc20024246

Ascochyta blight of chickpea is caused by Ascochyta rabiei (Pass.) Labr. which is primarily seedborne. For rapid detection and precise identification of A. rabiei, a sequence-characterized amplified region (SCAR) marker was developed for detection of genomic DNA and infected plant DNA. An SSR primer amplified monomorphic band was cloned in pGEM®-T easy vector and sequenced. The best primer pair was selected and validated on A. rabiei. The specificity and sensitivity of the SCAR-based marker designated as MBAR was evaluated using conventional PCR and real-time PCR. The marker produced consistently an amplicon size of 196 bp in all A. rabiei isolates tested. The sensitivity of the marker was 0.1 ng of genomic fungal DNA and 0.5 ng of plant DNA by conventional PCR and 0.5 pg of A. rabiei DNA and 1.0 pg of plant DNA by real-time PCR. This is the first SCAR marker having high specificity and sensitivity towards A. rabiei. The marker may be useful in detecting the pathogen before the disease appearance and in plant quarantine program to detect the pathogen in seed lots.

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$a Ascochyta blight of chickpea is caused by Ascochyta rabiei (Pass.) Labr. which is primarily seedborne. For rapid detection and precise identification of A. rabiei, a sequence-characterized amplified region (SCAR) marker was developed for detection of genomic DNA and infected plant DNA. An SSR primer amplified monomorphic band was cloned in pGEM®-T easy vector and sequenced. The best primer pair was selected and validated on A. rabiei. The specificity and sensitivity of the SCAR-based marker designated as MBAR was evaluated using conventional PCR and real-time PCR. The marker produced consistently an amplicon size of 196 bp in all A. rabiei isolates tested. The sensitivity of the marker was 0.1 ng of genomic fungal DNA and 0.5 ng of plant DNA by conventional PCR and 0.5 pg of A. rabiei DNA and 1.0 pg of plant DNA by real-time PCR. This is the first SCAR marker having high specificity and sensitivity towards A. rabiei. The marker may be useful in detecting the pathogen before the disease appearance and in plant quarantine program to detect the pathogen in seed lots.
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