Callose Mediated Plant Defense Mechanisms
Summary
Callose-mediated defence represents a fundamental component of the plant innate immune system. Callose, a β-1,3-D-glucan polymer, is rapidly synthesised at sites of biotic stress and deposited between the plasma membrane and cell wall to form papillae that physically reinforce cell boundaries. This deposition slows pathogen ingress, restricts intercellular movement of viruses by constricting plasmodesmatal channels, and contributes to wound sealing. The activity of callose synthase enzymes is tightly regulated by calcium signatures, reactive oxygen species (ROS) bursts and pattern-triggered immunity pathways, ensuring precise spatial and temporal control of polymerisation. Concurrently, β-1,3-glucanases modulate callose turnover, balancing defence and developmental requirements. Callose accumulation is triggered not only by fungal and bacterial pathogens but also by virus-transmitting vectors and certain herbivores, underlining its versatile role in coping with diverse attackers. Advances in molecular genetics and live-cell imaging have shed light on the trafficking of callose synthases, the cross-talk between hormonal signals such as salicylic acid and jasmonate, and the integration of callose deposition with other chemical defences. Understanding and manipulating these mechanisms offers promising avenues for enhancing crop resistance to a broad spectrum of plant pathogens.
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Callose Mediated Plant Defense Mechanisms publication trend
The graph below shows the total number of articles in callose mediated plant defense mechanisms across all publications each year (not limited to Nature Index journals).
Technical terms
Callose: A β-1,3-D-glucan polysaccharide polymerised at sites of pathogen attack to reinforce cell walls.
Callose synthase: A membrane-associated enzyme that catalyses the production of callose from UDP-glucose.
Papillae: Cell wall appositions enriched in callose and other compounds, formed at penetration sites to impede pathogen entry.
Plasmodesmata: Cytoplasmic channels between adjacent plant cells whose aperture is regulated by callose deposition.
Reactive oxygen species (ROS): Chemically reactive molecules produced upon pathogen detection that act as secondary messengers in defence signalling.
References
- Diversity and Traits of Multiple Biotic Stressors Elicit Differential Defense Responses in Legumes. Agriculture (2023).
- Regulation and Function of Defense-Related Callose Deposition in Plants. International Journal of Molecular Sciences (2021).
- Callose-mediated resistance to pathogenic intruders in plant defense-related papillae. Frontiers in Plant Science (2014).
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