The cytoskeleton enhances gene expression in the response to the Harpin elicitor in grapevine.
Summary of "The cytoskeleton enhances gene expression in the response to the Harpin elicitor in grapevine."
The cytoskeleton undergoes dramatic reorganization during plant defence. This response is generally interpreted as part of the cellular repolarization establishing physical barriers against the invading pathogen. To gain insight into the functional significance of cytoskeletal responses for defence, two Vitis cell cultures that differ in their microtubular dynamics were used, and the cytoskeletal response to the elicitor Harpin in parallel to alkalinization of the medium as a fast response, and the activation of defence-related genes were followed. In one cell line derived from the grapevine cultivar 'Pinot Noir', microtubules contained mostly tyrosinylated alpha-tubulin, indicating high microtubular turnover, whereas in another cell line derived from the wild grapevine V. rupestris, the alpha-tubulin was strongly detyrosinated, indicating low microtubular turnover. The cortical microtubules were disrupted and actin filaments were bundled in both cell lines, but the responses were elevated in V. rupestris as compared with V. vinifera cv. 'Pinot Noir'. The cytoskeletal responsiveness correlated with elicitor-induced alkalinization and the expression of defence genes. Using resveratrol synthase and stilbene synthase as examples, it could be shown that pharmacological manipulation of microtubules could induce gene expression in the absence of elicitor. These findings are discussed with respect to a role for microtubules as positive regulators of defence-induced gene expression.
Affiliation
College of Horticulture, Northwest Argriculture & Forestry University, Yangling 712100, Shaanxi, PR China.
Journal Details
This article was published in the following journal.
Name: Journal of experimental botany
ISSN: 1460-2431
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20675535
- DOI: http://dx.doi.org/10.1093/jxb/erq221
Medical and Biotech [MESH] Definitions
Epistasis, Genetic
A form of gene interaction whereby the expression of one gene interferes with or masks the expression of a different gene or genes. Genes whose expression interferes with or masks the effects of other genes are said to be epistatic to the effected genes. Genes whose expression is affected (blocked or masked) are hypostatic to the interfering genes.
Gene Knock-in Techniques
Techniques used to add in exogenous gene sequence such as mutated genes; REPORTER GENES, to study mechanisms of gene expression; or regulatory control sequences, to study effects of temporal changes to GENE EXPRESSION.
Gene Dosage
The number of copies of a given gene present in the cell of an organism. An increase in gene dosage (by GENE DUPLICATION for example) can result in higher levels of gene product formation. GENE DOSAGE COMPENSATION mechanisms result in adjustments to the level GENE EXPRESSION when there are changes or differences in gene dosage.
Facial Expression
Observable changes of expression in the face in response to emotional stimuli.
Gene Knockout Techniques
Techniques to alter a gene sequence that result in an inactivated gene, or one in which the expression can be inactivated at a chosen time during development to study the loss of function of a gene.
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