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The pathogen Phytophthora capsici Leon. is known to be a limiting factor of chile pepper (Capsicum L.) production around the world. The genetics of the resistance is becoming better understood due to the specific nature of the host-pathogen interaction, i.e., all plant organs are subject to infection. It has been shown that phytophthora root rot resistance and phytophthora foliar blight resistance are under different genetic mechanisms. This study aimed at understanding the inheritance of resistance of phytophthora stem blight and to determine whether phytophthora stem blight was the same disease syndrome as phytophthora root rot and phytophthora foliar blight. Stem cuttings of a segregating F2 population and testcross progeny facilitated the ability to screen for two disease syndromes concurrently. When the three disease syndromes were compared separately, the F2 populations fit a 3 resistant (R): 1 susceptible (S) ratio and the testcross progenies fit a 1R:1S ratio. When comparative studies were performed (stem vs. foliar and stem vs. root), the F2 populations fit a 9R/R:3R/S:3S/R:1S/S ratio and the testcross fit a 1R/R:1R/S:1S/R:1S/S ratio. These ratios are consistent of a single gene controlling the resistance of each system. Therefore, phytophthora stem blight, root rot, and foliar blight are three separate disease syndromes.
The oomycete plant pathogen, Phytophthora capsici , first described by Leon H. Leonian at the New Mexico Agricultural Research Station, is distributed globally and is a critical threat to vegetable production as a cause of damping-off, foliar
Phytophthora sojae is a destructive soilborne oomycete pathogen of soybean ( Glycine max ). Soybean phytophthora root and stem rot incited by P. sojae has been reported in Asia, Africa, Europe, North America, South America, and Oceania as soybean
Phytophthora capsici is a soilborne Oomycete with a host range exceeding 50 plant species ( Tian and Babadoost 2004 ). This polycyclic pathogen is responsible for significant plant losses when environmental conditions are favorable ( Erwin and
The oomycete Phytophthora capsici is a soilborne pathogen that causes severe and even complete yield loss in pepper worldwide ( Lamour et al., 2012 ). In Brazil, pepper root rot caused by P. capsici was observed for the first time in 1952 in São
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-death response and bacterial and oomycete proliferation Plant J. 72 843 855 Kim, M.C. Lee, S.H. Kim, J.K. Chun, H.J. Choi, M.S. Chung, W.S. 2002 Mlo , a modulator of plant defense and cell death, is a novel calmodulin-binding protein. Isolation and
. Panopoulos, N. Roubelakis-Angelakis, K. 2009 Engineered polyamine catabolism preinduces tolerance of tobacco to bacteria and oomycetes Plant Physiol. 149 1970 1981 Moschou, P.N. Wu, J. Cona, A. Tavladoraki, P. Angelini, R. Roubelakis-Angelakis, K.A. 2012 The
root diseases of strawberry and associated fungal and oomycete pathogens in Western Australia Australas. Plant Pathol. 40 109 119 Fang, X. Kuo, J. You, M. Finnegan, P. Barbetti, M. 2012 Comparative root colonisation of strawberry cultivars Camarosa and