Pathogens are one of the prevalent stresses to plants. Resistance mediated by the
resistance genes is efficient mechanism for evading the pathogens. To understand the
influence of various biotic and abiotic factors on resistance gene promoters, plants having
N gene promoter fused with reporter genes were developed. Experiments with tobacco
plants revealed that on tobacco mosaic virus infection, the N protein may increase in the
cells. Also, extreme temperature may result in decrease in the N protein. The salicylic
acid produced during the development of systemic acquired resistance does not hinder the
N promoter function. Hence, it can be concluded that the promoter region of resistance
genes can be influenced by many biotic and abiotic factors. In the tobacco plants lacking
the N gene, infection with tobacco mosaic virus leads to generation of systemic
recombination signal. Experiments suggest that this signal can lead to better tolerance of
the pathogen in next generation. Also, in the plants which received systemic
recombination signal, the resistance gene loci are hypermethylated and the frequency of
rearrangement in these loci increases. Hence, the signal results in higher tolerance to
pathogen and increased genetic variability in resistance genes. / xvi, 147 leaves : ill. (some col.) ; 29 cm.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:ALU.w.uleth.ca/dspace#10133/351 |
| Date | January 2006 |
| Creators | Kathiria, Palak, University of Lethbridge. Faculty of Arts and Science |
| Contributors | Kovalchuk, Igor |
| Publisher | Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2006, Arts and Science, Department of Biological Sciences |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
| Relation | Thesis (University of Lethbridge. Faculty of Arts and Science) |
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