Morphological and molecular diversity of Ascochyta rabiei (Pass.) Labr. pathogenic to Cicer arietinum L.

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Research Articles | Published:

Print ISSN : 0970-4078.
Online ISSN : 2229-4473.
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Doi: 10.1007/s42535-021-00322-x
First Page: 415
Last Page: 426
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Keywords: Ascochyta blight, Ascochyta rabiei , Diversity, RAPD, Pycnidiospore


To study the cultural, morphological and molecular diversity of Ascochyta rabiei infecting chickpea, 44 isolates were sampled from three different agro climatic regions of India over three years (2016–17, 2017–18 and 2018–19). Colony color of the A. rabiei isolates had varied shades of gray and white and produces flat and irregular colonies on potato dextrose agar. The growth rates of isolates varied from 1.02 to 2.46 mm/day. The higher conidial density of 4.05 × 10–6 was recorded in isolate AR-35. Molecular diversity data revealed that out of 58 RAPD markers, 43 markers produced polymorphic band among the 44 isolates with the PIC value ranged from 0.01 to 0.28. Maximum PIC value were revealed by the markers viz., OPA18 (0.2160), OPAU 12 (0.2496), OPB 06 (0.2275) and OPB 09 (0.2805). In cluster analysis isolates were categorized into six different clusters based on 72% similarity. The cluster VI consists of AR-11 and AR-5. The isolate AR-5 found to be diverge from the rest of the isolates and clusters. The cultural, morphological and genetic diversity studies established the existence of diversity and higher gene flow among the isolates of A. rabiei. Mutation and recombination are the main factors for their diversity. The results of the study help in developing resistant cultivars for newly evolving strains of A. rabiei.

Ascochyta blight, 
                Ascochyta rabiei
              , Diversity, RAPD, Pycnidiospore

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Authors are grateful to the DST-Science and Engineering Research Board (DST-SERB), New Delhi, Government of India (ECR/2016/000855) for financial assistance to carry out this research. Dr. N. P. Singh, The Director, ICAR-IIPR, Kanpur for constant encouragement and support to conduct this research.

Author Information

Manjunatha L.
Division of Crop Protection, ICAR-Indian Institute of Pulses Research, Kanpur, India
Rani Upasana
Pulses Section, Punjab Agricultural University, Ludhiana, India

Singh Shailendra
Division of Crop Protection, ICAR-Indian Institute of Pulses Research, Kanpur, India

Mahesha H. S.
CI Division, ICAR-Indian Grassland and Fodder Research Institute, Jhansi, India

Srinivasa N.
Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, New Delhi, India

Kumar Yogesh
Division of Crop Improvement, ICAR-Indian Institute of Pulses Research, Kanpur, India