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Abstract Detail


Plant-Pathogen Interactions

Mang, Hyung Gon [1], Qamar, Synan Abu [2], Laluk, Kristin [2], Park, Hyeong Cheol [3], Mengiste, Tesfaye [2], Jenks, Matthew A. [3], Hasegawa, Paul M. [3], Bressan, Ray A. [3].

Arabidopsis locus Resurrection (rst) Controls Susceptibility to Powdery Mildew.

 Plant growth and development is continuously modified by biotic and abiotic factors in the environment. Many biotic stresses can affect the yield of agricultural crops. The mechanism of plant response to pathogen attack is complex and there are still unknown factors affecting plant defense response. Our objective is to better understand plant defense mechanism to pathogenic fungi attack through a molecular and genetic approach. We recently isolated a novel Arabidopsis mutant called resurrection (rst) which shows reduced stem inflorescence and visual glaucousness due to altered cuticular wax structure and composition. Interestingly, rst mutants were disease susceptible to the obligate biotrophic powdery mildew. We hypothesize infected rst mutants interacting with various pathogens will provide information to better understand plant defense responses to pathogen invasion. We infected rst mutant plants with obligate biotrophic powdery mildew Erysiphe cichoracearum and necrotrophic fungal pathogens Botrytis cinerea and Alternaria brassicicola. Preliminary results indicate that rst plants were more susceptible to Erysiphe cichoracearum, however, showed greater resistance to Botrytis cinerea and Alternaria brassicicola than wild type plants. The enhanced fungal growth of Erysiphe cichoracearum developed more rapidly on the rst mutant; producing conidia earlier on rst than wild type plant. The analyses of transcript levels of genes involved in pathogen response PR1, PR2, NPR, PDF 1.2 indicate that RST mediated disease susceptibility involves salicylic acid (SA) dependent defense mechanisms. The RST locus may play an important role in plant pathogen interaction.


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1 - Purdue University, Horticulture & Landscape Architecture, 625 Agriculture Mall Dr., West Lafayette, IN, 47907, USA
2 - Purdue University, Botany and Plant Pathology
3 - Purdue University, Horticulture and Landscape Architecture

Keywords:
rst
Erysiphe cichoracearum
salicylic acid
powdery mildew.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P15081
Abstract ID:1958


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