Biology of callose (β-1,3-glucan) turnover at plasmodesmata

Raul ZavalievVitaly Citovsky


The turnover of callose (β-1,3-glucan) within cell walls is an essential process affecting many developmental, physiological and stress related processes in plants. The deposition and degradation of callose at the neck region of plasmodesmata (Pd) is one of the cellular control mechanisms regulating Pd permeability during both abiotic and biotic stresses. Callose accumulation at Pd is controlled by callose synthases (CalS; EC, endogenous enzymes mediating callose synthesis, and by β-1,3-glucanases (BG; EC, hydrolytic enzymes which specifically degrade callose. Transcriptional and posttranslational regulation of some CalSs and BGs are strongly controlled by stress signaling, such as that resulting from pathogen invasion. We review the role of Pd-associated callose in the regulation of intercellular communication during developmental, physiological, and stress response processes. Special emphasis is placed on the involvement of Pd-callose in viral pathogenicity. Callose accumulation at Pd restricts virus movement in both compatible and incompatible interactions, while its degradation promotes pathogen spread. Hence, studies on mechanisms of callose turnover at Pd during viral cell-to-cell spread are of importa...Continue Reading


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Related Concepts

Biological Adaptation to Stress
Region of Neck (Body Structure)
Enzymes, antithrombotic
Pathogenic Organism
GSL1 protein, Arabidopsis
Transcription, Genetic
CA8 gene
Beta-1,3-Glucanase Type II
Intercellular Communication Process

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