Phytoplasma-Triggered Ca2+ Influx Is Involved in Sieve-Tube Blockage
| Autor: | Rita Musetti, Stefanie V. Buxa, Federica De Marco, Alberto Loschi, Rachele Polizzotto, Karl-Heinz Kogel, Aart J. E. van Bel |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Molecular Plant-Microbe Interactions, Vol 26, Iss 4, Pp 379-386 (2013) |
| Druh dokumentu: | article |
| ISSN: | 1943-7706 0894-0282 |
| DOI: | 10.1094/MPMI-08-12-0207-R |
| Popis: | Phytoplasmas are obligate, phloem-restricted phytopathogens that are disseminated by phloem-sap-sucking insects. Phytoplasma infection severely impairs assimilate translocation in host plants and might be responsible for massive changes in phloem physiology. Methods to study phytoplasma- induced changes thus far provoked massive, native occlusion artifacts in sieve tubes. Hence, phytoplasma-phloem relationships were investigated here in intact Vicia faba host plants using a set of vital fluorescent probes and confocal laser-scanning microscopy. We focused on the effects of phytoplasma infection on phloem mass-flow performance and evaluated whether phytoplasmas induce sieve-plate occlusion. Apparently, phytoplasma infection brings about Ca2+ influx into sieve tubes, leading to sieve-plate occlusion by callose deposition or protein plugging. In addition, Ca2+ influx may confer cell wall thickening of conducting elements. In conclusion, phytoplasma effectors may cause gating of sieve-element Ca2+ channels leading to sieve-tube occlusion with presumptive dramatic effects on phytoplasma spread and photoassimilate distribution. |
| Databáze: | Directory of Open Access Journals |
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