Incompatible and compatible plant pathogen interactions
Date
2006
Authors
Kathiria, Palak
University of Lethbridge. Faculty of Arts and Science
Journal Title
Journal ISSN
Volume Title
Publisher
Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2006
Abstract
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.
Description
xvi, 147 leaves : ill. (some col.) ; 29 cm.
Keywords
Dissertations, Academic , Plant-pathogen relationships , Biotic communities