A Highly Sensitive Nested-PCR Method Using a Single Closed Tube for the Detection of Colletotrichum gloeosporioides causing Greater Yam Anthracnose
Keywords:
Greater yam, anthracnose, diagnosis, nested PCRAbstract
Greater yam is an important species of yam grown in different parts of India. Anthracnose or die back disease caused by Colletotrichum gloeosporioides reduces the yield up to 90 per cent. The pathogen survives in the soil debris and transmits the disease to the next season through tubers. In this study,a sensitive method for the specific diagnosis of C. gloeosporioides in soil and planting material was developed. The standard nested PCR previously described was re-standardized to run a single nested PCR in a closed tube. The problems of cross contamination and the increased risk of PCR product contamination, while handling the product of first PCR could be avoided. This technique could beachieved by adjusting the concentration of primers and the annealing temperature along with the standardization of PCR cycles so as to produce a single amplicon without compromising the limit of detection and specificity. The lowest amount of DNA that could be determined by this method was 200 pg ml-1.References
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