Morph-agronomic characterization of watermelon accessions with resistance to Fusarium Wilt

Costa, Antonio Elton da Silva; Cunha, Fábio Sanchez da; ARAÚJO, KECIA MAYARA GALVÃO DE; Neto, Izaias S Lima; Capucho, Alexandre Sandri; Borel, Jerônimo Constantino; Ishikawa, Francine Hiromi

doi:10.1590/0001-3765202120191359

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…In this way, future studies can identify accessions that can be used directly by farmers or included in breeding programs to be used as parents in crosses. Thus, there is a time gain in the stages of association of disease resistance previously evaluated (Costa et al, 2021) with the traits of agronomic interest.…”

Section: Resultsmentioning

confidence: 99%

“…lanatus and three of forage watermelon (C. lanatus var. citroides) collected in areas of traditional agricultural producers, which were previously evaluated and classified as resistant to Fusarium Wilt (Costa et al, 2021). In addition to the accessions, the commercial cultivars Sugar Baby susceptible to all races of Fon and Charleston Gray resistant to race 0 of Fon were used as control.…”

Section: Methodsmentioning

confidence: 99%

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Physicochemical characterization of watermelon accessions from traditional agriculture with resistance to Fusarium wilt

Silva,

Ishikawa,

Costa

et al. 2024

Rev. Ceres

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Physicochemical characterization of watermelon accessions from traditional agriculture with resistance to Fusarium wilt

Silva,

Ishikawa,

Costa

et al. 2024

Rev. Ceres

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“…In traditional farming, producers maintain a system of constant seed exchange between themselves which has promoted the conservation of variability for different characteristics of the crop (Romão 2000). Generally, there is no use of chemicals by traditional farmers, which makes it possible to select plants resistant to some pathogens (Costa et al 2021;Romão 2000). In this context, in 2015, germplasm collect expeditions were carried out in the semiarid region, having established the Vegetable Germplasm Bank from Universidade Federal do Vale do São Francisco (BGH-Univasf), which is composed by collections of about 300 accessions from traditional agriculture and spontaneous plants that still under characterization.…”

Section: Introductionmentioning

confidence: 99%

Inheritance of resistance to damping-off (Rhizoctonia solani) in watermelon

et al. 2022

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This study aimed to find sources of resistance to damping-off and to determine the inheritance of resistance in watermelon.Firstly, 72 watermelon accessions were inoculated with CMM 1053 isolate of Rhizoctonia solani. Only two accessions (BGH 29 and BGH 76) were considered moderately resistant to the disease. The inoculated plants without symptoms from accession BGH-29 identified as resistant were self-fertilized and the inbred line S 1 was used for the crosses. The reaction to R. solani after inoculation of the segregating populations of the cross and backcrosses between susceptible cultivar Crimson Sweet and the inbred line BGH-29 was evaluated. In other experiment eight S1 lines of watermelon were inoculated with six different isolates of R. solani and the reaction was evaluated by partial diallel analysis using the Griffing's method IV to obtain estimates of general resistance ability (GRA), general aggressiveness ability (GAA), and specific interaction ability (SIA). According to ratings of the susceptible and resistant parents, generations F 1 , F 2 , BC 1 (F 1 × P 1 ) and BC 2 (F 1 × P 2 ), resistance to damping-off was conferred by at least nine genes with additive effect and low heritability which indicates polygenic inheritance. The results of the diallel analysis corroborate with the analysis of segregating population, indicating inheritance of resistance was horizontal, since 46.1% of the total sum of squares of the variation observed in the crosses was due to GRA, while the SIA corresponded to only 20.39% of variation. This is the first report about inheritance of resistance to damping-off caused by R. solani in watermelon.

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Thymol Induces Cell Death of Fusarium oxysporum f. sp. niveum via Triggering Superoxide Radical Accumulation and Oxidative Injury In Vitro

et al. 2023

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Fusarium oxysporum f. sp. niveum (FON) causes watermelon wilt that is one of the major disease-causing yield losses of watermelon. Sustainable development of agriculture requires controlling watermelon wilt disease with good environmental performance. One important approach is to identify environmental-friendly compounds with inhibitory activity against FON. Thymol is a plant-derived compound that is safe for ecology. Little is known about the application of thymol in agriculture. In this study, we studied the inhibitory activity of thymol against FON by using morphological, physiological, and histochemical approaches. Thymol significantly inhibited colony diameter of FON in a dose-dependent manner, with EC50 at 21 µg/mL. Thymol at 10, 21, and 35 µg/mL decreased the fresh weight of FON mycelia by 29.0%, 50.6%, and 69.5%, respectively. Microscopic observation revealed irregular damage and loss of shape of mycelia upon thymol exposure. Thymol induced the accumulation of superoxide radical in mycelial cells and accompanied increased activity of antioxidative enzymes (SOD, superoxide dismutase; CAT, catalase). Thymol induced membrane permeability was indicated by lipid peroxidation and electrolyte leakage (increased by 29–58%) in mycelial cells. These results suggested that thymol induced oxidative damage in mycelia, which may be one of the possible reasons for thymol-induced mycelial cell death observed with fluorescent detection. Thymol decreased the production of conidia and inhibited the germination of conidia. Thymol induced superoxide radical accumulation, lipid peroxidation, and cell death in conidia as well. All of these results revealed the inhibitory activity of thymol against FON, which may have resulted from the superoxide radical-induced oxidative injury in both conidia and mycelia of FON.

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Morph-agronomic characterization of watermelon accessions with resistance to Fusarium Wilt

Cited by 3 publications

References 26 publications

Physicochemical characterization of watermelon accessions from traditional agriculture with resistance to Fusarium wilt

Physicochemical characterization of watermelon accessions from traditional agriculture with resistance to Fusarium wilt

Inheritance of resistance to damping-off (Rhizoctonia solani) in watermelon

Thymol Induces Cell Death of Fusarium oxysporum f. sp. niveum via Triggering Superoxide Radical Accumulation and Oxidative Injury In Vitro

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