| Abstract Detail
Temperature Responses Wang, Yi [1], Zhu, Ying [2], Hua, Jian [2]. Genetic dissection of temperature modulation of defense responses in Arabidopsis thaliana. High temperature is shown to suppress defense responses and cell death. However the molecular mechanisms underlying this modulation are not well known. bon1-1 and snc1-1 mutants exhibit dwarf phenotype due to constitutive activation of defense response at 22ºC while they are wild-type looking at 28ºC due to a suppression of defense responses by higher temperature. We are utilizing this temperature dependent growth phenotype to dissect the interplay between defense and temperature responses. The bon1 and snc1 seeds have been mutagenized and mutants exhibiting dwarf phenotypes at 28ºC have been isolated. Those with a bon1- or snc1-dependent phenotypes are named as int (insensitive to temperature). Several of the int mutants are now being characterized and their corresponding genes are being isolated. The int1 mutant showed a bon1-like dwarf phenotype at 22ºC and has an increased resistance to virulent pathogen. It appears to be an enhancer of bon1, suggesting that temperature modulation of defense is dependent on the strength of defense responses. int2 likely has a missense mutation in the R gene SNC1 , suggests that temperature modulation of defense response could occur at the R gene level. The cloning and characterizing of the INT genes will lead to further understanding of temperature modulation of defense responses.
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1 - Cornell University, Plant Biology Department, 144 Emerson Hall, Cornell University, Ithaca, NY, 14850, USA
2 - Cornell University, Plant Biology Department
Keywords:
temperature
pathogen defense
genetic screen.
Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P08023
Abstract ID:1871 |
