scholarly journals QTL Mapping of Fruit Rot Resistance to the Plant Pathogen Phytophthora capsici in a Recombinant Inbred Line Capsicum annuum Population

2014 ◽  
Vol 104 (5) ◽  
pp. 479-483 ◽  
Author(s):  
R. P. Naegele ◽  
H. Ashrafi ◽  
T. A. Hill ◽  
S. Reyes Chin-Wo ◽  
A. E. Van Deynze ◽  
...  
Keyword(s):  
Capsicum Annuum ◽  
Inbred Line ◽  
Recombinant Inbred Line ◽  
Recombinant Inbred ◽  
Specific Resistance ◽  
Phytophthora Capsici ◽  
Fruit Rot ◽  
Fruit Traits ◽  
Greenhouse Production ◽  
Foliar Blight

Phytophthora capsici is an important pepper (Capsicum annuum) pathogen causing fruit and root rot, and foliar blight in field and greenhouse production. Previously, an F6 recombinant inbred line population was evaluated for fruit rot susceptibility. Continuous variation among lines and partial and isolate-specific resistance were found. In this study, Phytophthora fruit rot resistance was mapped in the same F6 population between Criollo del Morelos 334 (CM334), a landrace from Mexico, and ‘Early Jalapeno’ using a high-density genetic map. Isolate-specific resistance was mapped independently in 63 of the lines evaluated and the two parents. Heritability of the resistance for each isolate at 3 and 5 days postinoculation (dpi) was high (h2 = 0.63 to 0.68 and 0.74 to 0.83, respectively). Significant additive and epistatic quantitative trait loci (QTL) were identified for resistance to isolates OP97 and 13709 (3 and 5 dpi) and 12889 (3 dpi only). Mapping of fruit traits showed potential linkage with few disease resistance QTL. The partial fruit rot resistance from CM334 suggests that this may not be an ideal source for fruit rot resistance in pepper.

scholarly journals Evaluation of Pepper Fruit for Resistance to Phytophthora capsici in a Recombinant Inbred Line Population, and the Correlation with Fruit Shape

Plant Disease ◽  
2014 ◽  
Vol 98 (7) ◽  
pp. 885-890 ◽  
Author(s):  
R. P. Naegele ◽  
M. K. Hausbeck
Keyword(s):  
Inbred Line ◽  
Recombinant Inbred Line ◽  
Recombinant Inbred Line Population ◽  
Recombinant Inbred ◽  
Phytophthora Capsici ◽  
Shape Index ◽  
Fruit Shape ◽  
Fruit Rot ◽  
Phenotypic Traits ◽  
Lesion Area

Phytophthora capsici causes fruit, root, and foliar blight on pepper (Capsicum annuum) in field production. Breeding for disease-resistant commercial pepper cultivars is essential to long-term management of P. capsici. In this study, the severity of Phytophthora fruit rot was evaluated in an F6 recombinant inbred line population between CM334, a landrace from Mexico, and the commercial ‘Early Jalapeño’. The two parents and 67 progeny lines were evaluated for fruit rot resistance at 3 and 5 days post inoculation (dpi) using three P. capsici isolates. Fruit shape was also evaluated for each line, and the correlation between shape and disease symptoms was investigated. Significant differences were detected among lines in lesion area measured 3 and 5 dpi, and in phenotypic traits (fruit length, width, and shape index). Of the fruit phenotypic traits measured, only fruit shape index had a significant, albeit weak (r = 0.2892, P = 0.02), correlation with lesion area when inoculated, and with only one of the three isolates of P. capsici evaluated. These results suggest that breeding for fruit rot resistance in pepper will have minimal linkage with fruit shape in the CM334 background.

scholarly journals Differentiation of Race Specific Resistance to Phytophthora Root Rot and Foliar Blight in Capsicum annuum

2003 ◽  
Vol 128 (2) ◽  
pp. 213-218 ◽  
Author(s):  
Lisa M. Oelke ◽  
Paul W. Bosland ◽  
Robert Steiner
Keyword(s):  
New Mexico ◽  
Capsicum Annuum ◽  
Root Rot ◽  
Specific Resistance ◽  
Phytophthora Capsici ◽  
Significant Implication ◽  
Phytophthora Root Rot ◽  
Physiological Races ◽  
Foliar Blight ◽  
Extensive Breeding

Despite extensive breeding efforts, no pepper (Capsicum annuum L. var. annuum) cultivars with universal resistance to phytophthora root rot and foliar blight (Phytophthora capsici Leon) have been commercially released. A reason for this limitation may be that physiological races exist within P. capsici, the causal agent of phytophthora root rot and phytophthora foliar blight. Physiological races are classified by the pathogen's reactions to a set of cultivars (host differential). In this study, 18 varieties of peppers were inoculated with 10 isolates of P. capsici for phytophthora root rot, and four isolates of P. capsici for phytophthora foliar blight. The isolates originated from pepper plants growing in New Mexico, New Jersey, Italy, Korea, and Turkey. For phytophthora root rot, nine of the 10 isolates were identified as different physiological races. The four isolates used in the phytophthora foliar blight study were all determined to be different races. The identification of physiological races within P. capsici has significant implication in breeding for phytophthora root rot and phytophthora foliar blight resistance.

Genetics of Winter Hardiness in 10 Lentil Recombinant Inbred Line Populations

Crop Science ◽  
2004 ◽  
Vol 44 (1) ◽  
pp. 5 ◽  
Author(s):  
A. Kahraman ◽  
I. Kusmenoglu ◽  
N. Aydin ◽  
A. Aydogan ◽  
W. Erskine ◽  
...  
Keyword(s):  
Inbred Line ◽  
Recombinant Inbred Line ◽  
Recombinant Inbred ◽  
Winter Hardiness

Genetic dissection of seed vigour under artificial ageing conditions using two joined maize recombinant inbred line populations

2014 ◽  
Vol 133 (6) ◽  
pp. 728-737 ◽  
Author(s):  
Lixia Ku ◽  
Xinjian Cui ◽  
Fangfang Cheng ◽  
Shulei Guo ◽  
Jianshuang Qi ◽  
...  
Keyword(s):  
Inbred Line ◽  
Recombinant Inbred Line ◽  
Recombinant Inbred ◽  
Artificial Ageing ◽  
Genetic Dissection ◽  
Seed Vigour

Diversity, Structure, and Marker-Trait Association Analysis of the Maize Recombinant Inbred Line Population

2011 ◽  
Vol 10 (7) ◽  
pp. 975-986 ◽  
Author(s):  
Jing-tang CHEN ◽  
Li-zong HU ◽  
Li-ying ZHU ◽  
Jin-jie GUO ◽  
Yong-feng ZHAO ◽  
...  
Keyword(s):  
Association Analysis ◽  
Inbred Line ◽  
Recombinant Inbred Line ◽  
Recombinant Inbred Line Population ◽  
Recombinant Inbred ◽  
Trait Association ◽  
Diversity Structure
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