TY - JOUR
T1 - Paranoid potato
T2 - phytophthora-resistant genotype shows constitutively activated defense
AU - Ali, Ashfaq
AU - Moushib, Laith Ibrahim
AU - Lenman, Marit
AU - Levander, Fredrik
AU - Olsson, Kerstin
AU - Carlson-Nilson, Ulrika
AU - Zoteyeva, Nadezhda
AU - Liljeroth, Erland
AU - Andreasson, Erik
PY - 2012/3
Y1 - 2012/3
N2 - Phytophthora is the most devastating pathogen of dicot plants. There is a need for resistance sources with different modes of action to counteract the fast evolution of this pathogen. In order to better understand mechanisms of defense against P. infestans, we analyzed several clones of potato. Two of the genotypes tested, Sarpo Mira and SW93-1015, exhibited strong resistance against P. infestans in field trials, whole plant assays and detached leaf assays. The resistant genotypes developed different sizes of hypersensitive response (HR)-related lesions. HR lesions in SW93-1015 were restricted to very small areas, whereas those in Sarpo Mira were similar to those in Solanum demissum, the main source of classical resistance genes. SW93-1015 can be characterized as a cpr (constitutive expressor of PR genes) genotype without spontaneous microscopic or macroscopic HR lesions. This is indicated by constitutive hydrogen peroxide (H₂O₂) production and PR1 (pathogenesis-related protein 1) secretion. SW93-1015 is one of the first plants identified as having classical protein-based induced defense expressed constitutively without any obvious metabolic costs or spontaneous cell death lesions.
AB - Phytophthora is the most devastating pathogen of dicot plants. There is a need for resistance sources with different modes of action to counteract the fast evolution of this pathogen. In order to better understand mechanisms of defense against P. infestans, we analyzed several clones of potato. Two of the genotypes tested, Sarpo Mira and SW93-1015, exhibited strong resistance against P. infestans in field trials, whole plant assays and detached leaf assays. The resistant genotypes developed different sizes of hypersensitive response (HR)-related lesions. HR lesions in SW93-1015 were restricted to very small areas, whereas those in Sarpo Mira were similar to those in Solanum demissum, the main source of classical resistance genes. SW93-1015 can be characterized as a cpr (constitutive expressor of PR genes) genotype without spontaneous microscopic or macroscopic HR lesions. This is indicated by constitutive hydrogen peroxide (H₂O₂) production and PR1 (pathogenesis-related protein 1) secretion. SW93-1015 is one of the first plants identified as having classical protein-based induced defense expressed constitutively without any obvious metabolic costs or spontaneous cell death lesions.
KW - Gene Expression Regulation, Plant/genetics
KW - Genotype
KW - Phytophthora/pathogenicity
KW - Plant Diseases/genetics
KW - Solanum tuberosum/genetics
U2 - 10.4161/psb.19149
DO - 10.4161/psb.19149
M3 - Article
C2 - 22476463
VL - 7
SP - 400
EP - 408
JO - Plant Signaling and Behavior
JF - Plant Signaling and Behavior
SN - 1559-2316
IS - 3
ER -