A dysfunctional movement protein of tobacco mosaic virus that partially modifies the plasmodesmata and limits virus spread in transgenic plants

Moshe Lapidot, Ron Gafny, Biao Ding, Shmuel Wolf, William J. Lucas, Roger N. Beachy*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

143 Scopus citations

Abstract

A chimeric gene encoding a dysfunctional tobacco mosaic virus (TMV) movement protein (MP) mutant lacking amino acids 3, 4 and 5 (MPΔ3-5), was expressed in transgenic Nicotlana tabacum Xanthi and Xanthi NN plants. Immunogold labeling studies of tissues from transgenic plants indicated that while wild-type MP accumulated in the plasmodesmata, MPΔ3-5 did not. Tissue fractionation studies confirmed that only a low level of the mutant MP accumulated in the cell wall-enriched fraction compared with the accumulation of the wild-type MP. Dye coupling studies showed that MPΔ3-5 enabled the movement between leaf mesophyll cells of a fluorescently labeled dextran of 3 kDa, while 9.4 kDa molecules failed to move. In contrast, in transgenic plants expressing the wild-type MP gene the 9.4 kDa probe did move from cell to cell. Seedlings from self-fertilized transgenic plants were inoculated with TMV and observed for disease symptoms. Transgenic Xanthi NN plants that expressed the MPΔ3-5gene developed fewer and smaller necrotic local lesions compared with control plants following inoculation with TMV. Transgenic Xanthi nn plants were delayed in the development of systemic symptoms. Inoculating the transgenic plants with TMV-RNA, and the tobamo-viruses TMGMV and SHMV, essentially produced the same results, i.e. inhibition of disease development. These results demonstrate that transgenic plants expressing an inactive MP can inhibit virus disease spread presumably by interfering with its cell-to-cell movement.

Original languageAmerican English
Pages (from-to)959-970
Number of pages12
JournalPlant Journal
Volume4
Issue number6
DOIs
StatePublished - 1993

Fingerprint

Dive into the research topics of 'A dysfunctional movement protein of tobacco mosaic virus that partially modifies the plasmodesmata and limits virus spread in transgenic plants'. Together they form a unique fingerprint.

Cite this