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4 results for “stem blight”
Identification and fine mapping of gummy stem blight resistance gene Gsb-7(t) in Melon
<p>Gummy stem blight (GSB), caused by the <em>Didymella bryoniae</em> (Auersw.) Rehm, is a devastating fungal disease of melon worldwide. Breeding GSB-resistant cultivars with host resistance genes is considered to be the most economic and effective strategy to control this disease. In this study, 260 melon germplasm resources were screened for resistance to GSB, and an inbred line H55R exhibited immunity to GSB was identified. To further understand the resistance mechanism of H55R against GSB, an F<sub>2</sub> population was obtained from a cross between the GSB-susceptible line A15 and H55R, and genetic analysis indicated that the resistance in H55R was controlled by a single dominant gene, tentatively named <em>Gsb-7(</em><em>t</em><em>)</em>. The <em>Gsb-7(</em><em>t</em><em>)</em> gene was finally delimited to a 140 kb interval on chromosome 7 using bulked-segregant analysis and chromosome walking strategies. Ten putative genes were annotated in this region that contains a wall-associated receptor kinase (WAK) gene <em>MELO3C</em><em>010403</em>. The <em>MELO3C</em><em>010403</em> gene contains two alternative transcripts, T1 and T2, with five and seven non-synonymous mutation sites, respectively. Gene expression analysis showed that expression of T1 but not the T2 was significantly induced by the <em>D</em><em>.</em><em> bryoniae</em> at 24 hours post-inoculation (hpi), indicating that the T2 transcript of <em>MELO3C</em><em>010403</em> was the most likely candidate gene of <em>Gsb-7(t)</em><em>.</em> Our results offer new genetic resources and will be helpful for the development of GSB-resistant melon cultivars in the future.</p>
Figure 2 from: Zhao L, Cai J, He W, Zhang Y (2019) Macrophomina vaccinii sp. nov. causing blueberry stem blight in China. MycoKeys 55: 1-14. https://doi.org/10.3897/mycokeys.55.35015
Figure 2 Macrophominavaccinii (from ex-type: CGMCC 3.19503). a Pycnidia forming on pine needle bSclerotia on the synthetic nutrient-poor agar c Conidiogenous cells d Microconidia e–f Conidia with apical appendages (arrows). Scale bars: 1 mm (a); 10 µm (b–f).
Figure 3 from: Zhao L, Cai J, He W, Zhang Y (2019) Macrophomina vaccinii sp. nov. causing blueberry stem blight in China. MycoKeys 55: 1-14. https://doi.org/10.3897/mycokeys.55.35015
Figure 3 Macrophominavaccinii causes stem blight of blueberry. a Death of the blueberry (Vaccinium spp.) plants in the field b Symptoms of stem blight of blueberry in the field c Symptoms of Macrophominavaccinii after three days inoculation d Symptoms of Macrophominavaccinii after one-week inoculation e Symptoms of Macrophominavaccinii after three weeks inoculation f Symptoms of blueberry twig of Macrophominavaccinii after three weeks inoculation.
Figure 1 from: Zhao L, Cai J, He W, Zhang Y (2019) Macrophomina vaccinii sp. nov. causing blueberry stem blight in China. MycoKeys 55: 1-14. https://doi.org/10.3897/mycokeys.55.35015
Figure 1 Maximum parsimony tree generated from sequence analysis of the concatenated ITS, tef1-α, TUB and ACT dataset. Designated out group taxa is B.dothidea. Maximum parsimony (MP) and maximum likelihood (ML) bootstrap support greater than or equal to 60% are shown above the nodes (* = value less than 60%). The positions of the Macrophominavaccinii isolates are indicated in bold and red text.
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