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Keywords = Phomopsis stem blight

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18 pages, 3078 KB  
Article
Identification of a Major QTL and Development of a CAPS Marker Associated with Stem Blight Resistance in BC1 Populations Derived from Interspecific Crosses Between Asparagus officinalis L. and Asparagus kiusianus Makino
by Yanxing Lu, Yoko Takeuchi, Emika Kakizoe, Eri Kato, Masaru Matsumoto, Yoshiyuki Yamagata, Jun-ichiro Masuda, Yuki Mizunoe, Keita Tomiyoshi, Kaori Sakai, Mostafa Abdelrahman, Akira Kanno, Takao Ikeuchi, Mitsutaka Mori, Kyoko Murakami, Atsuko Uragami, Shin-ichi Watanabe and Yukio Ozaki
Horticulturae 2026, 12(8), 953; https://doi.org/10.3390/horticulturae12080953 - 2 Aug 2026
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Abstract
Stem blight, caused by Phomopsis asparagi, is the most serious disease affecting the cultivation of asparagus (Asparagus officinalis L.) in the warm regions of East and Southeast Asia, including Japan. Although Asparagus kiusianus, a wild species endemic to Japan, shows [...] Read more.
Stem blight, caused by Phomopsis asparagi, is the most serious disease affecting the cultivation of asparagus (Asparagus officinalis L.) in the warm regions of East and Southeast Asia, including Japan. Although Asparagus kiusianus, a wild species endemic to Japan, shows strong resistance to this disease and is cross-compatible with cultivated asparagus, the genetic basis of this resistance remains unclear. In this study, we used BC1 populations from interspecific crosses between A. officinalis and A. kiusianus to dissect stem blight resistance inheritance and identify markers suitable for marker-assisted selection. Disease severity was evaluated using P. asparagi inoculation, and RAD sequencing was used to construct a linkage map and perform QTL analysis. Segregation patterns suggested that resistance was controlled by major genes and polygenic factors which depended on the cross combination. A major QTL was detected on chromosome 1 and SNP_PRK showed a significant association (LOD > 3). A dCAPS marker derived from SNP_PRK was associated with resistance, with approximately 80% of individuals carrying the associated genotype showing resistance. CAPS marker PR1 distinguished the same genotype classes and produced results consistent with those obtained using PRK in the evaluated materials. PR1 may therefore facilitate resistant individual selection in breeding programs. Full article
(This article belongs to the Section Biotic and Abiotic Stress)
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30 pages, 2366 KB  
Article
The Resistance of Narrow-Leafed Lupin to Diaporthe toxica Is Based on the Rapid Activation of Defense Response Genes
by Michał Książkiewicz, Sandra Rychel-Bielska, Piotr Plewiński, Maria Nuc, Witold Irzykowski, Małgorzata Jędryczka and Paweł Krajewski
Int. J. Mol. Sci. 2021, 22(2), 574; https://doi.org/10.3390/ijms22020574 - 8 Jan 2021
Cited by 11 | Viewed by 4706
Abstract
Narrow-leafed lupin (Lupinus angustifolius L.) is a grain legume crop that is advantageous in animal nutrition due to its high protein content; however, livestock grazing on stubble may develop a lupinosis disease that is related to toxins produced by a pathogenic fungus, [...] Read more.
Narrow-leafed lupin (Lupinus angustifolius L.) is a grain legume crop that is advantageous in animal nutrition due to its high protein content; however, livestock grazing on stubble may develop a lupinosis disease that is related to toxins produced by a pathogenic fungus, Diaporthe toxica. Two major unlinked alleles, Phr1 and PhtjR, confer L. angustifolius resistance to this fungus. Besides the introduction of these alleles into modern cultivars, the molecular mechanisms underlying resistance remained unsolved. In this study, resistant and susceptible lines were subjected to differential gene expression profiling in response to D. toxica inoculation, spanning the progress of the infection from the early to latent phases. High-throughput sequencing of stem transcriptome and PCR quantification of selected genes were performed. Gene Ontology term analysis revealed that an early (24 h) response in the resistant germplasm encompassed activation of genes controlling reactive oxygen species and oxylipin biosynthesis, whereas in the susceptible germplasm, it comprised induction of xyloglucan endotransglucosylases/hydrolases. During the first five days of the infection, the number of genes with significantly altered expressions was about 2.6 times higher in resistant lines than in the susceptible line. Global transcriptome reprogramming involving the activation of defense response genes occurred in lines conferring Phr1 and PhtjR resistance alleles about 4–8 days earlier than in the susceptible germplasm. Full article
(This article belongs to the Special Issue Plant Innate Immunity 4.0)
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