Enhanced Nutritional Programme: An Innovative Approach to Controlling Plant Diseases in the Tropics

Ahmad, Khalil; Ismail, Siti Izera

doi:10.1007/978-3-319-27455-3_12

Cited by 2 publications

(1 citation statement)

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“…In citrus trees infected with Liberibacter species it is common to find increased concentrations of potassium and decreased concentrations of calcium, manganese, and zinc [ 56 ]. As one of the numerous attempts to control HLB, the enhanced nutritional programme (ENPs) has been executed in order to control this nutrient disparity [ 57 ]. Some recent reports indicated that the supplementation of mineral fertilizers containing zinc, iron, or copper, decreased the symptoms in HLB infected trees [ 58 ], resulting in an increased productivity in a 5-year span [ 59 ].…”

Section: Discussionmentioning

confidence: 99%

Zinc is an inhibitor of the LdtR transcriptional activator

et al. 2018

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LdtR is a master regulator of gene expression in Liberibacter asiaticus, one of the causative agents of citrus greening disease. LdtR belongs to the MarR-family of transcriptional regulators and it has been linked to the regulation of more than 180 genes in Liberibacter species, most of them gathered in the following Clusters of Orthologous Groups: cell motility, cell wall envelope, energy production, and transcription. Our previous transcriptomic evidence suggested that LdtR is directly involved in the modulation of the zinc uptake system genes (znu) in the closely related L. crescens. In this report, we show that LdtR is involved in the regulation of one of the two encoded zinc uptake mechanisms in L. asiaticus, named znu2. We also show that LdtR binds zinc with higher affinity than benzbromarone, a synthetic effector inhibitory molecule, resulting in the disruption of the LdtR:promoter interactions. Using site-directed mutagenesis, electrophoretic mobility shift assays (EMSAs), and isothermal titration calorimetry, we identified that residues C28 and T43 in LdtR, located in close proximity to the Benz1 pocket, are involved in the interaction with zinc. These results provided new evidence of a high-affinity effector molecule targeting a key player in L. asiaticus’ physiology and complemented our previous findings about the mechanisms of signal transduction in members of the MarR-family.

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Section: Discussionmentioning

confidence: 99%

Zinc is an inhibitor of the LdtR transcriptional activator

et al. 2018

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Rhizobacteria with nematicide aptitude: enzymes and compounds associated

Castañeda-Alvarez

Aballay

2016

World J Microbiol Biotechnol

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The use of rhizobacteria to control plant parasitic nematodes has been widely studied. Currently, the research focuses on bacteria-nematode interactions that can mitigate this complex microbiome in agriculture. Various enzymes, toxins and metabolic by-products from rhizobacteria antagonize plant parasitic nematodes, and many different modes of action have been proposed. Hydrolytic enzymes, primarily proteases, collagenases and chitinases, have been related to the nematicide effect in rhizobacteria, proving to be an important factor involved in the degradation of different chemical constituents of nematodes at distinct developmental stages. Exuded metabolites may also alter the nematode-plant recognition process or create a hostile environment for nematodes in the rhizosphere. Specific bacteria strains responsible for the production of toxins, such as Cry proteins, are one of the strategies used by rhizobacteria. Characterization of the rhizobacteria mode of action could strengthen the development of commercial products to control populations of plant parasitic nematodes. This review aims to provide an overview of different enzymes and compounds produced by rhizobacteria related to the process of antagonism to plant-parasitic nematodes.

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Enhanced Nutritional Programme: An Innovative Approach to Controlling Plant Diseases in the Tropics

Cited by 2 publications

References 68 publications

Zinc is an inhibitor of the LdtR transcriptional activator

Zinc is an inhibitor of the LdtR transcriptional activator

Rhizobacteria with nematicide aptitude: enzymes and compounds associated

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