Biochemical and molecular studies on the resistance mechanisms in tea [Camellia sinensis (L.) O. Kuntze] against blister blight disease

Nisha, Sam Nirmala; Gajjeraman, Prabu; Mandal, Abul Kalam Azad

doi:10.1007/s12298-018-0565-9

Cited by 20 publications

(15 citation statements)

References 27 publications

(31 reference statements)

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“…The relative intensity of the expression of these genes was found to be higher in the resistant cultivar SA6 in comparison to susceptible cultivar TES34. Also, the expression of these pathogenesis-related genes was found to increase along with each successive stage of blister blight infection [71]. A similar study was conducted recently on the biochemical characterization of resistant tea cultivar AV-2 and susceptible cultivar B-157.…”

Section: Host Resistance Against Blister Blight Diseasesupporting

confidence: 63%

Blister Blight Disease of Tea: An Enigma

Chaliha¹,

Kalita²

2021

Diagnostics of Plant Diseases

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Tea is one of the most popular beverages consumed across the world and is also considered a major cash crop in countries with a moderately hot and humid climate. Tea is produced from the leaves of woody, perennial, and monoculture crop tea plants. The tea leaves being the source of production the foliar diseases which may be caused by a variety of bacteria, fungi, and other pests have serious impacts on production. The blister blight disease is one such serious foliar tea disease caused by the obligate biotrophic fungus Exobasidium vexans. E. vexans, belonging to the phylum basidiomycete primarily infects the young succulent harvestable tea leaves and results in ~40% yield crop loss. It reportedly alters the critical biochemical characteristics of tea such as catechin, flavonoid, phenol, as well as the aroma in severely affected plants. The disease is managed, so far, by administering high doses of copper-based chemical fungicides. Although alternate approaches such as the use of biocontrol agents, biotic and abiotic elicitors for inducing systemic acquired resistance, and transgenic resistant varieties have been tested, they are far from being adopted worldwide. As the research on blister blight disease is chiefly focussed towards the evaluation of defense responses in tea plants, during infection very little is yet known about the pathogenesis and the factors contributing to the disease. The purpose of this chapter is to explore blister blight disease and to highlight the current challenges involved in understanding the pathogen and pathogenic mechanism that could significantly contribute to better disease management.

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Section: Host Resistance Against Blister Blight Diseasesupporting

confidence: 63%

Blister Blight Disease of Tea: An Enigma

Chaliha¹,

Kalita²

2021

Diagnostics of Plant Diseases

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“…In addition, SbMYB8, a TF from Chinese medical herb Scutellaria baicalensis, regulated CHS gene expression and increased flavonoid accumulation in transgenic tobacco, conferring elevated tolerance against drought stress [103]. Recently, flavonoids in tea (Camellia sinensis) were identified to mediate resistance against a crop destructive disease blister blight caused by Exobasidium vaxans [121]. The flavonoid biosynthesis in tea plants was regulated by CsMYB2/CsMYB26 that was directly bound to the promoters of CsF3'H and CsLAR, two flavonoid biosynthetic genes [104].…”

Section: Myb Tfsmentioning

confidence: 99%

Transcriptional Factors Regulate Plant Stress Responses Through Mediating Secondary Metabolism

Meraj

Raza

et al. 2020

Genes

182

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Plants are adapted to sense numerous stress stimuli and mount efficient defense responses by directing intricate signaling pathways. They respond to undesirable circumstances to produce stress-inducible phytochemicals that play indispensable roles in plant immunity. Extensive studies have been made to elucidate the underpinnings of defensive molecular mechanisms in various plant species. Transcriptional factors (TFs) are involved in plant defense regulations through acting as mediators by perceiving stress signals and directing downstream defense gene expression. The cross interactions of TFs and stress signaling crosstalk are decisive in determining accumulation of defense metabolites. Here, we collected the major TFs that are efficient in stress responses through regulating secondary metabolism for the direct cessation of stress factors. We focused on six major TF families including AP2/ERF, WRKY, bHLH, bZIP, MYB, and NAC. This review is the compilation of studies where researches were conducted to explore the roles of TFs in stress responses and the contribution of secondary metabolites in combating stress influences. Modulation of these TFs at transcriptional and post-transcriptional levels can facilitate molecular breeding and genetic improvement of crop plants regarding stress sensitivity and response through production of defensive compounds.

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“…Plant phenols are parts of a highly efficient biological defence system against pests and diseases. Nisha, Prabu, & Mandal (2018) described that flavonoid, and phenolic contents provide a wide range of beneficial effects, including protection against abiotic and biotic stress, among plants. They serve as factors that contribute to plant resistance.…”

Section: Resultsmentioning

confidence: 99%

“…Plant phenolics are also biochemical defensive factors produced by plants against pests. Nisha, Prabu, & Mandal (2018) explained that phenol and flavonoids are biochemicals in defensive systems against insects. Phenolics negatively affect the mortality of insects.…”

Section: Resistant Characters Selection Teamentioning

confidence: 99%

Evaluation of Resistant Tea (Camellia sinensis L.) Clones Against Helopeltis bradyi

et al. 2021

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Helopeltis bradyi is a significant pest that causes yield losses and reduces the quality of tea plantations by piercing and sucking the sap of tea leaves. This pest can be appropriately controlled by using resistant clones. The PGL series (clones) owned by Pagilaran plantation has high yield and quality. However, information their resistance level against H. bradyi is limited. This research was conducted at Pagilaran tea plantation at an altitude of 990 masl. Six PGL clone series (PGL 4, PGL 6, PGL 9, PGL 10, PGL 11, and PGL 15) and control clones (TRI 2025 and Gambung 7) were used as plant materials. Their morphological and biochemical characteristics were determined to evaluate their resistance level against H. bradyi. The results revealed that the score symptoms (under 10%) of PGL 4, PGL 9, PGL 10, PGL 11, and PGL 15 clones were the lowest, so these clones were categorized to be highly resistant. In addition, the total phenol content and trichome density of PGL 4, PGL 10, and PGL 15 clones were the highest. Among them, the PGL 4 clone had the thickest epidermis. These characteristics likely contributed to the morphological and biochemical defence mechanisms of tea plants against H. bradyi.

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Biochemical and molecular studies on the resistance mechanisms in tea [Camellia sinensis (L.) O. Kuntze] against blister blight disease

Cited by 20 publications

References 27 publications

Blister Blight Disease of Tea: An Enigma

Blister Blight Disease of Tea: An Enigma

Transcriptional Factors Regulate Plant Stress Responses Through Mediating Secondary Metabolism

Evaluation of Resistant Tea (Camellia sinensis L.) Clones Against Helopeltis bradyi

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