Characterization and Pathogenicity of Lasiodiplodia theobromae Causing Black Root Rot and Identification of Novel Sources of Resistance in Mulberry Collections

Belaghihalli N. Gnanesh; Gondi S. Arunakumar; Avuthu Tejaswi; M. Supriya; Haniyambadi B. Manojkumar; Suvala Shalini Devi

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저자정보: Belaghihalli N. Gnanesh (Central Sericultural Research and Training Institute) Gondi S. Arunakumar (Central Sericultural Research and Training Institute) Avuthu Tejaswi (Central Sericultural Research and Training Institute) M. Supriya (Central Sericultural Research and Training Institute) Haniyambadi B. Manojkumar (Central Sericultural Research and Training Institute) Suvala Shalini Devi (Humanities and Commerce)

저널정보: 한국식물병리학회 The Plant Pathology Journal The Plant Pathology Journal 제38권 제4호

발행연도: 2022.8

수록면: 272 - 286 (15page)

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Black root rot (BRR) caused by Lasiodiplodia theobromae is an alarming disease of mulberry that causes tremendous economic losses to sericulture farmers in India and China. Successful control of this disease can be attained by screening germplasm and identifying resistant sources. Seventy four diseased root samples were collected from farmer’s fields belonging to four major mulberry growing states of South India. Based on morpho-cultural and scanning electron microscopy studies, 57 fungal isolates were characterized and identified as L. theobromae. Phylogenetic analysis of concatenated internal transcribed spacer and β-tubulin sequences revealed variation of the representative 20 isolates of L. theobromae. Following the root dip method of inoculation, pathogenicity studies on susceptible mulberry genotypes (Victory-1 and Thailand male) recognized the virulent isolate MRR-142. Accordingly, MRR-142 isolate was used to evaluate resistance on a set of 45 diverse mulberry accessions. In the repeated experiments, the mulberry accession ME-0168 which is an Indonesian origin belonging to Morus latifolia was found to be highly resistant consistently against BRR. Eight accessions (G2, ME-0006, ME-0011, ME-0093, MI-0006, MI-0291, MI-0489, and MI-0501) were found to be resistant. These promising resistant resources may be exploited in mulberry breeding for developing BRR resistant varieties and to develop mapping populations which successively helps in the identification of molecular markers associated with BRR.

#black root rot #Lasiodiplodia theobromae #mulberry #pathogenicity #resistance

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