Analysis of late-blight disease resistance and freezing tolerance in transgenic potato plants expressing sense and antisense genes for an osmotin-like protein |
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Authors: | Baolong Zhu Tony H. H. Chen Paul H. Li |
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Affiliation: | (1) Laboratory of Plant Hardiness, Department of Horticultural Sciences and Plant Biological Sciences Program, University of Minnesota, 55108 St. Paul, MN, USA;(2) Department of Horticulture, Center for Gene Research and Biotechnology, Oregon State University, 97331 Corvallis, OR, USA;(3) Present address: Department of Botany and Plant Sciences, University of California, 92521 Riverside, CA, USA |
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Abstract: | The expression patterns of plant defense genes encoding osmotin and osmotin-like proteins imply a dual function in osmotic stress and plant pathogen defense. We have produced transgenic potato (Solanum commersonii Dun.) plants constitutively expressing sense or antisense RNAs from chimeric gene constructs consisting of the cauliflower mosaic virus 35S promoter and a cDNA (pA13) for an osmotin-like protein. Transgenic potato plants expressing high levels of the pA13 osmotin-like protein showed an increased tolerance to the late-blight fungus Phytophthora infestans at various phases of infection, with a greater resistance at an early phase of fungal infection. There was a decrease in the accumulation of osmotin-like mRNAs and proteins when antisense transformants were challenged by fungal infection, although the antisense transformants did not exhibit any alterations in disease susceptibility. Expression of pA13 sense and antisense RNAs had no effect on the development of freezing tolerance in transgenic plants when assayed under a variety of conditions including treatments with abscisic acid or low temperature. These results provide evidence of antifungal activity for a potato osmotin-like protein against the fungus P. infestans, but do not indicate that pA13 osmotin-like protein is a major determinant of freezing tolerance. |
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Keywords: | Late-blight disease Osmotin-like proteins Pathogenesis-related proteins Phytophthora Sense and antisense RNAs Solanum |
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