Wheat mutant MNR220 delays haustoria formation during leaf rust pathogenesis at the seedling stage
Talajoor, Mina R.
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This study reports further characterization of the defence mechanism of an EMS-induced mutant (MNR220) that displays enhanced resistance to leaf rust, stem rust, stripe rust and powdery mildew diseases. The broad-spectrum resistance of the mutant was characterized by a microscopy study and additional race screenings of two rust pathogens. The mutant displayed less disease severity in response to all the races tested, when compared with the wild-type. The microscopy study of the pathogenesis of a leaf rust race PBJJG on the mutant revealed that the resistance was first evident at the pre-haustorial stage; formation of haustoria was significantly delayed or inhibited in the mutant compared with the wild-type. The mutant displayed microscopic level of cell death even in the absence of any pathogens. These findings suggest that MNR220 mediates a spontaneous cell death that delays the infection process by delaying haustoria formation of the pathogen.
Talajoor, Mina, Xiaojing Wang, Hongtao Zhang, Peng Zhang, Sridhar Bhavani, Linda Tabe, Evans Lagudah, and Li Huang. "Wheat mutant MNR220 delays haustoria formation during leaf rust pathogenesis at the seedling stage." Canadian Journal of Plant Pathology 38, no. 3 (September 2016): 338-347. DOI: 10.1080/07060661.2016.1205663.