Abstract
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.
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Claims 4
Claim · model-written summary
Resistance distribution patterns differed with female parental susceptibility and inoculum density.
- Taxon
- peppert0
- Material
- female parental susceptibilitye0
- Treatment
- inoculum densitiese0
- Interactor
- Phytophthora capsici
.jpg?width=60)
Phytophthora capsicie1pathogene0 - Outcome
- distribution patternse0
- Direction
- variede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The distribution patterns were varied, depending upon female parental susceptibility as well as inoculum densities.”
t0“Chili Pepper”
e1“Phytophthora capsici Leonian causes root rot and stem blight in pepper”
Claim · model-written summary
Pepper survival rates decreased as pathogen inoculum density increased.
- Taxon
- peppere0
- Treatment
- inoculum densitye0
- Interactor
- Phytophthora capsiciPhytophthora capsicie1pathogene0
- Outcome
- pepper survival ratese0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as the inoculum density increased, pepper survival rates decreased”
e1“Phytophthora capsici Leonian causes root rot and stem blight in pepper”
Claim · model-written summary
A common dominant resistant gene participated in Phytophthora root rot resistance in all inheritance analyses.
- Taxon
- peppert0
- Interactor
- Phytophthora
Phytophthorae0pathogen - Gene
- one common dominant resistant genee0
- Outcome
- resistance to Phytophthora root rote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In all of the inheritance analyses, one common dominant resistant gene was participated in resistance to Phytophthora root rot.”
t0“Chili Pepper”
Claim · model-written summary
A complementary gene together with the major dominant gene was necessary for resistance at high inoculum density.
- Taxon
- peppert0
- Interactor
- Phytophthora capsiciPhytophthora capsicie1pathogene0
- Gene
- a complementary genee0
- Outcome
- resistancee0
- Value
- 9:7 (R:S)e0
- Qualifier
- a high (10 6 ) inoculum densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“Chili Pepper”
e1“Phytophthora capsici Leonian causes root rot and stem blight in pepper”