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Tiwari RK, Lal MK, Kumar R, Mangal V, Kumar A, Kumar R, Sharma S, Sagar V, Singh B. Salt stress influences the proliferation of Fusarium solani and enhances the severity of wilt disease in potato. Heliyon 2024; 10:e26718. [PMID: 38434015 PMCID: PMC10906416 DOI: 10.1016/j.heliyon.2024.e26718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 02/13/2024] [Accepted: 02/19/2024] [Indexed: 03/05/2024] Open
Abstract
Soil salinity has emerged as a critical abiotic stress in potato production, whereas wilt disease, caused by Fusarium solani, is the significant biotic stress. An experiment was performed to decipher the occurrence of wilt incidence by F. solani FJ1 under the influence of salinity in both in vitroand pot culture conditions. High salt concentration negatively influenced root and shoot development in the variety "Kufri Jyoti" but positively affected the mycelial growth and sporulation behaviours of F. solani FJ1. There was abundant whitish mycelial growth with enhanced biomass and high sporulation (microconidia production) in F. solani FJ1 cultured on salt-supplemented media. Moreover, under high salinity conditions (EC 2-8 dS m-1), severe wilting and rotting of vascular bundles were observed in plants artificially inoculated with F. solani FJ1. The mortality rate of potato plants was significantly higher under individual and combined stresses as compared to control. The wilt index of individual and combined stressed plants was also substantially higher compared to the control. Additionally, compared to the control, there was a significant decrease in total chlorophyll content and membrane stability index of the leaves under combined stress. However, the total phenols were increased under stress conditions. The total sugar content of potato plants decreased in infected plants, but increased when exposed to salt stress or a combination of salt stress and pathogen infection. F. solani infection also increased the activity of peroxidase (POX) and decreased the activity of phenylalanine ammonia-lyase (PAL) and catalase (CAT). These results suggest that Fusarium wilt and dry rot will be a more severe disease for potato cultivation in saline soils.
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Affiliation(s)
- Rahul Kumar Tiwari
- Division of Plant Protection, ICAR-Central Potato Research Institute, Shimla, HP 171001, India
- Division of Crop Protection, ICAR-Indian Institute of Sugarcane Research, Lucknow, Uttar Pradesh 226002, India
| | - Milan Kumar Lal
- Division of CPB&PHT, ICAR-Central Potato Research Institute, Shimla, HP 171001, India
- Division of Crop Physiology and Biochemistry, ICAR-National Rice Research Institute, Cuttack 753006, Odisha, India
| | - Ravinder Kumar
- Division of Plant Protection, ICAR-Central Potato Research Institute, Shimla, HP 171001, India
- Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, New Delhi 110012, India
| | - Vikas Mangal
- Division of Crop Improvement, ICAR-Central Potato Research Institute, Shimla, HP 171001, India
| | - Awadhesh Kumar
- Division of Crop Physiology and Biochemistry, ICAR-National Rice Research Institute, Cuttack 753006, Odisha, India
| | - Rakesh Kumar
- Division of Plant Protection, ICAR-Central Potato Research Institute, Shimla, HP 171001, India
| | - Sanjeev Sharma
- Division of Plant Protection, ICAR-Central Potato Research Institute, Shimla, HP 171001, India
| | - Vinay Sagar
- Division of Plant Protection, ICAR-Central Potato Research Institute, Shimla, HP 171001, India
| | - Brajesh Singh
- Division of CPB&PHT, ICAR-Central Potato Research Institute, Shimla, HP 171001, India
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Iqbal Z, Shafiq M, Sattar MN, Ali I, Khurshid M, Farooq U, Munir M. Genetic Diversity, Evolutionary Dynamics, and Ongoing Spread of Pedilanthus Leaf Curl Virus. Viruses 2023; 15:2358. [PMID: 38140599 PMCID: PMC10747432 DOI: 10.3390/v15122358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Revised: 11/28/2023] [Accepted: 11/29/2023] [Indexed: 12/24/2023] Open
Abstract
Pedilanthus leaf curl virus (PeLCV) is a monopartite begomovirus (family Geminiviridae) discovered just a few decades ago. Since then, it has become a widely encountered virus, with reports from ca. 25 plant species across Pakistan and India, indicative of its notable evolutionary success. Viruses mutate at such a swift rate that their ecological and evolutionary behaviors are inextricably linked, and all of these behaviors are imprinted on their genomes as genetic diversity. So, all these imprints can be mapped by computational methods. This study was designed to map the sequence variation dynamics, genetic heterogeneity, regional diversity, phylogeny, and recombination events imprinted on the PeLCV genome. Phylogenetic and network analysis grouped the full-length genome sequences of 52 PeLCV isolates into 7 major clades, displaying some regional delineation but lacking host-specific demarcation. The progenitor of PeLCV was found to have originated in Multan, Pakistan, in 1977, from where it spread concurrently to India and various regions of Pakistan. A high proportion of recombination events, distributed unevenly throughout the genome and involving both inter- and intraspecies recombinants, were inferred. The findings of this study highlight that the PeLCV population is expanding under a high degree of genetic diversity (π = 0.073%), a high rate of mean nucleotide substitution (1.54 × 10-3), demographic selection, and a high rate of recombination. This sets PeLCV apart as a distinctive begomovirus among other begomoviruses. These factors could further exacerbate the PeLCV divergence and adaptation to new hosts. The insights of this study that pinpoint the emergence of PeLCV are outlined.
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Affiliation(s)
- Zafar Iqbal
- Central Laboratories, King Faisal University, Al-Ahsa P.O. Box 55110, Saudi Arabia;
| | - Muhammad Shafiq
- Department of Biotechnology, University of Management and Technology, Sialkot Campus, Sialkot P.O. Box 51340, Pakistan;
| | | | - Irfan Ali
- Centre of Agricultural Biochemistry and Biotechnology, University of Agriculture, Faisalabad P.O. Box 38000, Pakistan;
| | - Muhammad Khurshid
- School of Biochemistry and Biotechnology, University of the Punjab, Lahore P.O. Box 54590, Pakistan;
| | - Umer Farooq
- Department of Biotechnology, University of Sialkot, Sialkot P.O. Box 51340, Pakistan;
| | - Muhammad Munir
- Date Palm Research Center of Excellence, King Faisal University, Al-Ahsa P.O. Box 31982, Saudi Arabia;
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Kumar R, Kaundal P, Tiwari RK, Lal MK, Kumari H, Kumar R, Sagar V, Singh B. Optimization of a simple, low-cost one-step reverse transcription recombinase polymerase amplification method for real-time detection of potato virus A in potato leaves and tubers. 3 Biotech 2023; 13:373. [PMID: 37854940 PMCID: PMC10579207 DOI: 10.1007/s13205-023-03791-w] [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: 07/11/2023] [Accepted: 09/25/2023] [Indexed: 10/20/2023] Open
Abstract
Vegetative propagation of potatoes makes it possible for potato viruses to be transmitted through tubers. Potato virus A (PVA) is one of these viruses, which belongs to the Potyvirus genus in the Potyviridae family. Potato tuber yield can be reduced by 30-40% by PVA alone. Losses can be further exacerbated by potato virus X and/or potato virus Y infection. PVA is transmitted primarily by several species of aphids in non-persistent manner. With the aim of resolving this problem, we developed one-step reverse transcription-recombinase polymerase amplification (RT-RPA), a highly sensitive and cost-effective method for detecting PVA in both potato tubers and leaves. Detection and amplification are performed using isothermal conditions in this method. There was good amplification of the coat protein gene in PVA with all three primers tested. To conduct this study, a primer set that can amplify specific 185 base pair (bp) product was selected. PVA detection was optimized by 30-min amplification reactions, which showed no cross-reactivity with other potato viruses. A simple heating block or water bath was used to amplify PVA product using RT-RPA at a temperature range of 38-42 °C. In comparison to conventional reverse transcription-polymerase chain reaction (RT-PCR), the newly developed RT-RPA protocol exhibited high sensitivity for both potato leaves and tuber tissues. Using cellular paper-based simple RNA extraction procedure, the virus was detected in leaf samples as efficiently as purified total RNA. We also found that combining LiCl-based RNA precipitation with cellular paper discs allowed us to successfully optimize RNA extraction for one-step RT-RPA for detecting PVA in tubers. Tests using this simplified one-step RT-RPA method were successfully applied to 300 samples of both leaves and tubers from various potato cultivars. In our knowledge, this is the first report of an RT-RPA assay utilizing simple RNA obtained from either cellular disc paper or LiCl coupled with cellular disc paper to detect PVA. As a result, this method was equally sensitive and specific for detecting PVA in potatoes. The developed RT-RPA assay is more versatile, durable, and do not require highly purified RNA templates, thus providing an effective alternative to RT-PCR assays for screening of germplasm, certifying planting materials, breeding for virus resistance, and real-time monitoring of PVA.
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Affiliation(s)
- Ravinder Kumar
- ICAR-Central Potato Research Institute, Shimla, Himachal Pradesh 171001 India
- Present Address: ICAR-Indian Agricultural Research Institute, New Delhi, 110012 India
| | - Priyanka Kaundal
- ICAR-Central Potato Research Institute, Shimla, Himachal Pradesh 171001 India
| | - Rahul Kumar Tiwari
- ICAR-Central Potato Research Institute, Shimla, Himachal Pradesh 171001 India
| | - Milan Kumar Lal
- ICAR-Central Potato Research Institute, Shimla, Himachal Pradesh 171001 India
| | - Hema Kumari
- ICAR-Central Potato Research Institute, Shimla, Himachal Pradesh 171001 India
| | - Rakesh Kumar
- ICAR-Central Potato Research Institute, Shimla, Himachal Pradesh 171001 India
| | - Vinay Sagar
- ICAR-Central Potato Research Institute, Shimla, Himachal Pradesh 171001 India
| | - Brajesh Singh
- ICAR-Central Potato Research Institute, Shimla, Himachal Pradesh 171001 India
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Jeevalatha A, Siddappa S, Kumar R, Tiwari RK, Lal MK, Sharma S, Chakrabarti SK, Singh BP. RNA-seq analysis reveals an early defense response to tomato leaf curl New Delhi virus in potato cultivar Kufri Bahar. Funct Integr Genomics 2023; 23:215. [PMID: 37389664 DOI: 10.1007/s10142-023-01138-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 06/06/2023] [Accepted: 06/15/2023] [Indexed: 07/01/2023]
Abstract
Potatoes in India are very susceptible to apical leaf curl disease, which causes severe symptoms and greater yield losses. Because the majority of potato cultivars are susceptible to the virus, it is crucial to discover sources of resistance and investigate the mechanism of resistance/susceptibility in potato cultivars. In this study, the gene expression profile of two potato cultivars, Kufri Bahar (resistant) and Kufri Pukhraj (susceptible), varying in their level of resistance to ToLCNDV, was analyzed using RNA-Seq. The Ion ProtonTM system was used to sequence eight RiboMinus RNA libraries from inoculated and uninoculated potato plants at 15 and 20 days after inoculation (DAI). The findings indicated that the majority of differentially expressed genes (DEGs) were cultivar-or time-specific. These DEGs included genes for proteins that interact with viruses, genes linked with the cell cycle, genes for proteins involved in defense, transcription and translation initiation factors, and plant hormone signaling pathway genes. Interestingly, defense responses were generated early in Kufri Bahar, at 15 DAI, which may have impeded the replication and spread of ToLCNDV. This research provides a genome-wide transcriptional analysis of two potato cultivars with variable levels of ToLCNDV resistance. At an early stage, we observed suppression of genes that interact with viral proteins, induction of genes associated with restriction of cell division, genes encoding defense proteins, AP2/ERF transcription factors, and altered expression of zinc finger protein genes, HSPs, JA, and SA pathway-related genes. Our findings add to a greater comprehension of the molecular basis of potato resistance to ToLCNDV and may aid in the development of more effective disease management techniques.
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Affiliation(s)
- Arjunan Jeevalatha
- ICAR- Central Potato Research Institute, Shimla, 171 001, Himachal Pradesh, India
- ICAR- Indian Institute of Spices Research, Kozhikode, 673 012, Kerala, India
| | - Sundaresha Siddappa
- ICAR- Central Potato Research Institute, Shimla, 171 001, Himachal Pradesh, India
| | - Ravinder Kumar
- ICAR- Central Potato Research Institute, Shimla, 171 001, Himachal Pradesh, India.
| | - Rahul Kumar Tiwari
- ICAR- Central Potato Research Institute, Shimla, 171 001, Himachal Pradesh, India.
| | - Milan Kumar Lal
- ICAR- Central Potato Research Institute, Shimla, 171 001, Himachal Pradesh, India
| | - Sanjeev Sharma
- ICAR- Central Potato Research Institute, Shimla, 171 001, Himachal Pradesh, India
| | | | - Bir Pal Singh
- ICAR- Central Potato Research Institute, Shimla, 171 001, Himachal Pradesh, India
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