Publications by authors named "Ramesh Sundar"

Life cycle of the dimorphic sugarcane smut fungi, Sporisorium scitamineum, involves recognition and mating of compatible saprophytic yeast-like haploid sporidia (MAT-1 and MAT-2) that upon fusion, develop into infective dikaryotic mycelia. Although the dimorphic transition is intrinsically linked with the pathogenicity and virulence of S. scitamineum, it has never been studied using a proteomic approach.

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This work aims to provide an effective hybrid beam forming method with Dual-Deep-Network to overcome overhead for mm-wave massive MIMO systems. In this paper, a Dual-Deep-Network technique is described for the extraction of statistical structures from a hybrid beam forming model based on mmWave logics, as well as training logic for the network map functions. The proposed approach of DDN is trained with proper data sequences used for communication and the training phase is conducted with the norms of numerous channel variants.

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Sugarcane smut caused by the basidiomycetous fungus is one of the most devastating diseases that affect sugarcane production, globally. At present, the most practical and effective management strategy for the disease is the cultivation of resistant cultivars. In this connection, a detailed understanding of the host's defense mechanism in response to smut isolates with varying degrees of virulence at the molecular level would facilitate the development of reliable and durable smut-resistant sugarcane varieties.

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The differential compatibility responses of sugarcane to Colletotrichum falcatum pathotypes depend on the nature of both host primary defence signalling cascades and pathogen virulence. The complex polyploidy of sugarcane genome and genetic variations in different cultivars of sugarcane remain a challenge to identify and characterise specific genes controlling the compatible and incompatible interactions between sugarcane and the red rot pathogen, Colletotrichum falcatum. To avoid host background variation in the interaction study, suppression subtractive hybridization (SSH)-based next-generation sequencing (NGS) technology was used in a sugarcane cultivar Co 7805 which is compatible with one C.

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Article Synopsis
  • The study focuses on the ascomycete pathogen that causes red rot in sugarcane and its enzymes that break down plant cell walls, enabling infection.
  • Comparative transcriptome analysis identified specific CAZy genes involved in producing cellulolytic and pectinolytic enzymes in two pathotypes of the pathogen, revealing significant differences in virulence.
  • The findings highlight the importance of certain enzymes and genes in sugarcane cell wall degradation, providing new insights into the pathogen's mechanisms of infection.
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Red rot of sugarcane caused by the hemi-biotrophic fungal pathogen, Colletotrichum falcatum, is a major threat to sugarcane cultivation in many tropical countries such as India, Bangladesh, and Pakistan. With the accumulating information on pathogenicity determinants, namely, effectors and pathogen-associated molecular patterns (PAMPs) of C. falcatum, it is of paramount importance to decipher the functional role of these molecular players that may ultimately decide upon the outcome of sugarcane-C.

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Article Synopsis
  • The study investigates the life cycle and pathogenicity of Sporisorium scitamineum, the fungus responsible for smut disease in sugarcane, by using genetically modified strains that express green fluorescent protein (GFP) for better visualization.
  • Researchers isolated haploid sporidia from teliospores and confirmed opposite mating types, then successfully transformed these sporidia to track their development and colonization in sugarcane plants through microscopy.
  • The findings reveal significant fungal colonization during the disease's initial stages, leading to the characteristic formation of smut whips, thereby enhancing understanding of S. scitamineum's lifecycle and its impact on sugarcane.
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Unlabelled: is a teleomorphic, biotrophic fungus causing the globally prevalent sugarcane smut disease in sugarcane. The severity of the disease depends on two major factors, viz. degree of resistance in the host genotype and virulence level of the pathogen.

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Article Synopsis
  • Red rot, caused by Colletotrichum falcatum, is a significant disease affecting sugarcane, necessitating the development of resistant varieties, though resistance often fails due to new pathogen races.
  • Researchers are investigating key genes related to the pathogen's virulence, focusing on Glucose Transporter (GT) and Sucrose Non-Fermenting1 (SNF1), which are important for sugar metabolism and pathogen growth during infection.
  • By using RNA silencing to knock down these genes in the fungus, mutants displayed reduced virulence and failed to produce spores, confirming the critical roles of GT and SNF1 in C. falcatum's pathogenesis.
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The microRNAs role in various cellular and metabolic functions is gaining more limelight in line with second-generation NGS technology. For the validation of candidate miRNA genes, the quantitative real-time PCR is the widely trusted and efficient method to follow. Sugarcane miRNAs are less explored in sugarcane defense response during their interaction with inciting red rot.

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an intriguing pathogen causing red rot in sugarcane, exhibits enormous variation for pathogenicity under field conditions. A species-specific marker is very much needed to classify the virulence among the varying population and to identify the potential of a pathotype by mining the microsatellites, which are considered to be the largest genetic source to develop molecular markers for an organism. In this study, we have mined the genome using MISA database which yielded 12,121 SSRs from 48.

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Article Synopsis
  • Red rot caused by Colletotrichum falcatum is a significant threat to sugarcane in tropical and sub-tropical regions, making the understanding of defense mechanisms vital for crop management.
  • This study investigated the expression of genes related to major defense-signaling pathways during both resistant and susceptible interactions using qRT-PCR, focusing on the hypersensitive response, salicylic acid, and jasmonic acid/ethylene pathways.
  • Findings revealed that the nonexpressor of pathogenesis-related genes 1 (NPR1) and salicylic acid pathway genes were notably upregulated in resistant cultivars during incompatible interactions and in response to defense inducers, demonstrating the effectiveness of these pathways in enhancing resistance against red rot.
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Colletotrichum falcatum, a hemibiotrophic fungal pathogen, causes one of the major devastating diseases of sugarcane-red rot. C. falcatum secretes a plethora of molecular signatures that might play a crucial role during its interaction with sugarcane.

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Unlabelled: Colletotrichum falcatum, an intriguing hemibiotrophic fungal pathogen causes red rot, a devastating disease of sugarcane. Repeated in vitro subculturing of C. falcatum under dark condition alters morphology and reduces virulence of the culture.

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Smut caused by Sporisorium scitamineum is one of the important diseases of sugarcane with global significance. Despite the intriguing nature of sugarcane, S. scitamineum interaction, several pertinent aspects remain unexplored.

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Red rot is a serious disease of sugarcane caused by the fungus Colletotrichum falcatum imposing a considerable economic loss annually in all sugarcane-producing countries. In this study, we analyzed the early resistance response of sugarcane to red rot fungus by comparing the differences between control and inoculated stalk tissues. Differential display reverse transcription polymerase chain reaction (DD-RT-PCR) was employed to identify altered expression of genes in disease-resistant cv Co 93009, in response to pathogen infection.

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