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Targeted modification of homogalacturonan by transgenic expression of a fungal polygalacturonase alters plant growth

TitleTargeted modification of homogalacturonan by transgenic expression of a fungal polygalacturonase alters plant growth
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2004
AuthorsCapodicasa, Cristina, Vairo D., Zabotina O., McCartney L., Caprari C., Mattei B., Manfredini C., Aracri B., Benen J., Knox J.P., De Lorenzo G., and Cervone F.
JournalPlant Physiology
Pagination1294 - 1304
Date Published2004
ISBN Number00320889 (ISSN)
KeywordsAntibodies, Ara, Arabidopsis, article, Aspergillus, Aspergillus niger, Base Sequence, Cell walls, Cells, development and aging, DNA Primers, endopolygalacturonase II, enzymology, Fungi, Genes, Genetically Modified, genetics, growth, isolation and purification, metabolism, Nicotiana, Nicotiana obtusifolia, Nicotiana tabacum, nucleotide sequence, pectin, Pectins, plant stem, Plant Stems, Plants, Plants (botany), polygalacturonase, polygalacturonic acid, primer DNA, recombinant protein, Recombinant Proteins, Tobacco, transgenic plant

Pectins are a highly complex family of cell wall polysaccharides comprised of homogalacturonan (HGA), rhamnogalacturonan I and rhamnogalacturonan II. We have specifically modified HGA in both tobacco (Nicotiana tabacum) and Arabidopsis by expressing the endopolygalacturonase II of Aspergillus niger (AnPGII). Cell walls of transgenic tobacco plants showed a 25% reduction in GalUA content as compared with the wild type and a reduced content of deesterified HGA as detected by antibody labeling. Neutral sugars remained unchanged apart from a slight increase of Rha, Ara, and Gal. Both transgenic tobacco and Arabidopsis were dwarfed, indicating that unesterified HGA is a critical factor for plant cell growth. The dwarf phenotypes were associated with AnPGII activity as demonstrated by the observation that the mutant phenotype of tobacco was completely reverted by crossing the dwarfed plants with plants expressing PGIP2, a strong inhibitor of AnPGII. The mutant phenotype in Arabidopsis did not appear when transformation was performed with a gene encoding AnPGII inactivated by site directed mutagenesis.


Cited By :34Export Date: 29 September 2015CODEN: PLPHACorrespondence Address: Cervone, F.; Dipartimento di Biologia Vegetale, Lab. 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