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Jundae Lee,Won Phil Lee,Jae Bok Yoon,Byoung-Cheorl Kang 한국육종학회 2012 한국육종학회지 Vol.44 No.4
Phytophthora capsici Leonian causes root rot and stem blight in pepper (Capsicum spp.) and is a serious threat to pepper production because of its ability to infect every root, stem, and leaf at any developmental stage. Recently, pepper F1 cultivars resistant to Phytophthora root rot have been commercially released in Korea. However, despite many studies, the inheritance of resistance remains controversial due to differences in experimental methods, including pepper materials, pathogen isolates, inoculation conditions, and evaluation methods. Our aim was to determine the inheritance of Phytophthora root rot resistance by using three different F2 populations derived from crosses between ‘CM334’ (a resistant male parent) and three Korean landraces, ‘Subicho’ ‘Daehwacho’ and ‘Chilsungcho’ (susceptible female parents), and inoculating them with three different pathogen densities (1 -10 4 , 1 -105 , and 1 -106 zoospores/ml). The distribution patterns were varied, depending upon female parental susceptibility as well as inoculum densities. For example, as the inoculum density increased, pepper survival rates decreased. In all of the inheritance analyses, one common dominant resistant gene was participated in resistance to Phytophthora root rot. In addition, we found that a complementary gene, together with the major dominant gene, was necessary for resistance at a high (10 -6) inoculum density, based on a 9:7 (R:S) segregation ratio. This study will be helpful in developing molecular markers linked to genes that are resistant to Phytophthora root rot.
Lee, Jundae,Han, Jung-Heon,An, Chul-Geon,Lee, Won Phil,Yoon, Jae Bok Japanese Society of Breeding 2010 Breeding science Vol.60 No.1
<P>Genic male sterility (GMS) has been widely used as a tool for hybrid seed production in chili pepper (<I>Capsicum annuum</I> L.). Little work has been done on the development of molecular markers linked to pepper GMS genes, which are generally controlled by a recessive nuclear gene. In this study, we developed a DNA marker linked to paprika GMS using bulked segregant analysis (BSA) and an amplified fragment length polymorphism (AFLP) technique. Two F<SUB>2</SUB> populations were made by selfing commercial F<SUB>1</SUB> varieties of ‘Mirage’ and ‘Fiesta’ and subjected to BSA-AFLP using 256 primer combinations. Among five reproducible polymorphic primer combinations, an AFLP marker Egat/Mcgg was converted to a codominant cleavage amplified polymorphic sequence (CAPS) marker. This marker, named PmsM1-CAPS, is located about 2 to 3 cM from the <I>ms</I> locus. Although PmsM1-CAPS was not correlated with GMS in ‘MiniBell’ because it was a different GMS gene, the marker was found to be useful in screening for male sterility, as tested in F<SUB>2</SUB> progenies from ‘Helsinki’ and F<SUB>3</SUB> families derived from the F<SUB>1</SUB> varieties used in this study.</P>