A New Cell Wall Located N-rich Protein is Strongly Induced During the Hypersensitive Response in Glycine Max L. |
| |
Authors: | Andrea A Ludwig Raimund Tenhaken |
| |
Institution: | (1) FB Biologie, Universität Kaiserslautern, D-67653 Kaiserslautern, Germany;(2) Present address: The Sainsbury Laboratory, John Innes Centre, Norwich, UK;(3) FB Biologie, Universität Kaiserslautern, D-67653 Kaiserslautern, Germany |
| |
Abstract: | Soybean (Glycine max (L.) Merill, cv. Williams 82) plants and cell cultures respond to avirulent pathogens with a hypersensitive reaction. After inoculation of soybean with Pseudomonas syringae pv. glycinea, carrying the avirulence gene avrA, or zoospores from the fungus Phytophthora sojae Race 1, a resistance-gene-dependent cell death programme is activated. A new gene was identified by differential display of mRNAs that is specifically activated during the early phase of incompatible pathogen-soybean interactions but does not respond to compatible pathogens. The gene is strongly induced within 2h after addition of P. sojae zoospores. A similar kinetic pattern was observed for P. syringae (avrA) inoculated soybean cell cultures. The gene encodes a deduced protein of 368 amino acids with a very high content of asparagine and was therefore termed N-rich protein (NRP). The protein is composed of two distinct domains, of which only the C-terminal domain has striking homology to proteins of unknown function from other plants. An antibody raised against the recombinant NRP recognizes a protein of 42kDa. The protein is located in the cell wall as indicated by cell fractionation studies. Comparison of the genomic DNA-sequence with the cDNA, identified two introns within the open reading frame. The NRP-gene is not directly induced by salicylic acid or hydrogen peroxide, indicating a distinct and specific signal transduction pathway which is only activated during programmed cell death. The NRP-gene appears to be a new marker in soybean activated early in plant disease resistance. |
| |
Keywords: | differential display programmed cell death Pseudomonas syringae pv glycinea salicylic acid soybean |
本文献已被 SpringerLink 等数据库收录! |
|