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Harish J, Jambhulkar PP, Bajpai R, Arya M, Babele PK, Chaturvedi SK, Kumar A, Lakshman DK. Morphological characterization, pathogenicity screening, and molecular identification of Fusarium spp. isolates causing post-flowering stalk rot in maize. Front Microbiol 2023; 14:1121781. [PMID: 37065162 PMCID: PMC10102488 DOI: 10.3389/fmicb.2023.1121781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 03/14/2023] [Indexed: 04/03/2023] Open
Abstract
Post flowering stalk rot (PFSR) of maize caused by the Fusarium species complex is a serious threat to maize production worldwide. The identification of Fusarium species causing PFSR based on morphology traditionally relies on a small set of phenomic characteristics with only minor morphological variations among distinct Fusarium species. Seventy-one isolates were collected from 40 sites in five agro-climatic zones of India to assess the diversity of Fusarium spp. associated with maize crops showing symptoms of PFSR in the field. To investigate the pathogenicity of Fusarium spp. causing PFSR sixty isolates were toothpick inoculated between the first and second node at 55 days after sowing during the tassel formation stage of the crop in Kharif (Rainy season), and Rabi (Winter season) season field trials. Ten most virulent Fusarium isolates, based on the highest observed disease index, were identified by homology and phylogenetic analyses of partial sequences of the translation elongation factor 1 α (Tef-1α). Based on morphological traits such as mycelial growth patterns and mycelial pigmentation, Fusarium isolates were divided into nine clusters. The isolates were judged to be virulent based on their ability to decrease seedling vigour in in-vivo situations and high disease severity in field experiments. Pathogenicity test during the Kharif season showed 12 isolates with virulent disease symptoms with a mean severity ranging between 50 to 67 percent disease index (PDI) whereas in Rabi season, only five isolates were considered virulent, and the mean severity ranged between 52 to 67 PDI. Based on pathological characterization and molecular identification, 10 strains of Fusarium species namely, Fusarium acutatum (2/10), Fusarium verticillioides (Syn. Gibberella fujikuroi var. moniliformis) (7/10), Fusarium andiyazi (2/10) recorded the highest diseases index. All these species are part of the Fusarium fujikuroi species complex (FFSC). The distribution of virulent isolates is specific to a geographical location with a hot humid climate. Increased knowledge regarding the variability of Fusarium spp. responsible for PFSR of maize occurring across wide geographical locations of India will enable more informed decisions to be made to support the management of the disease, including screening for resistance in maize-inbred lines.
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Affiliation(s)
- J. Harish
- Department of Plant Pathology, College of Agriculture, Rani Lakshmi Bai Central Agricultural University, Jhansi, Uttar Pradesh, India
| | - Prashant P. Jambhulkar
- Department of Plant Pathology, College of Agriculture, Rani Lakshmi Bai Central Agricultural University, Jhansi, Uttar Pradesh, India
| | - Ruchira Bajpai
- Department of Plant Pathology, College of Agriculture, Rani Lakshmi Bai Central Agricultural University, Jhansi, Uttar Pradesh, India
| | - Meenakshi Arya
- Department of Plant Pathology, College of Agriculture, Rani Lakshmi Bai Central Agricultural University, Jhansi, Uttar Pradesh, India
| | - Piyoosh K. Babele
- College of Agriculture, Rani Lakshmi Bai Central Agricultural University, Jhansi, Uttar Pradesh, India
| | - Sushil K. Chaturvedi
- College of Agriculture, Rani Lakshmi Bai Central Agricultural University, Jhansi, Uttar Pradesh, India
| | - Anil Kumar
- College of Agriculture, Rani Lakshmi Bai Central Agricultural University, Jhansi, Uttar Pradesh, India
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Taboada G, Abán CL, Mercado Cárdenas G, Spedaletti Y, Aparicio González M, Maita E, Ortega-Baes P, Galván M. Characterization of fungal pathogens and germplasm screening for disease resistance in the main production area of the common bean in Argentina. FRONTIERS IN PLANT SCIENCE 2022; 13:986247. [PMID: 36161011 PMCID: PMC9490223 DOI: 10.3389/fpls.2022.986247] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 08/04/2022] [Indexed: 06/16/2023]
Abstract
The common bean (Phaseolus vulgaris L.) is the most important grain legume in the human diet, mainly in Africa and Latin America. Argentina is one of the five major producers of the common bean in the world, and the main cultivation areas are concentrated in the northwestern provinces of this country. Crop production of the common bean is often affected by biotic factors like some endemic fungal diseases, which exert a major economic impact on the region. The most important fungal diseases affecting the common bean in Argentina are white mold caused by Sclerotinia sclerotiorum, angular leaf spot caused by Pseudocercospora griseola, web blight and root rot caused by Rhizoctonia solani, which can cause production losses of up to 100% in the region. At the present, the most effective strategy for controlling these diseases is the use of genetic resistance. In this sense, population study and characterization of fungal pathogens are essential for developing cultivars with durable resistance. In this review we report diversity studies carried out on these three fungal pathogens affecting the common bean in northwestern Argentina, analyzing more than 200 isolates by means of molecular, morphological and pathogenic approaches. Also, the screening of physiological resistance in several common bean commercial lines and wild native germplasm is reviewed. This review contributes to the development of sustainable management strategies and cultural practices in bean production aimed to minimize yield losses due to fungal diseases in the common bean.
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Affiliation(s)
- Gisel Taboada
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) CCT-Salta, Salta, Argentina
- Instituto Nacional de Tecnología Agropecuaria (INTA) EEA Salta, Salta, Argentina
| | - Carla L. Abán
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) CCT-Salta, Salta, Argentina
- Instituto Nacional de Tecnología Agropecuaria (INTA) EEA Salta, Salta, Argentina
| | | | - Yamila Spedaletti
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) CCT-Salta, Salta, Argentina
- Instituto Nacional de Tecnología Agropecuaria (INTA) EEA Salta, Salta, Argentina
| | - Mónica Aparicio González
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) CCT-Salta, Salta, Argentina
- Instituto Nacional de Tecnología Agropecuaria (INTA) EEA Salta, Salta, Argentina
| | - Efrain Maita
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) CCT-Salta, Salta, Argentina
- Laboratorio de Investigaciones Botánicas (LABIBO), Facultad de Ciencias Naturales, Universidad Nacional de Salta, Salta, Argentina
| | - Pablo Ortega-Baes
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) CCT-Salta, Salta, Argentina
- Laboratorio de Investigaciones Botánicas (LABIBO), Facultad de Ciencias Naturales, Universidad Nacional de Salta, Salta, Argentina
| | - Marta Galván
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) CCT-Salta, Salta, Argentina
- Instituto Nacional de Tecnología Agropecuaria (INTA) EEA Salta, Salta, Argentina
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