Two new species of rust fungi (Pucciniales) from the Brazilian Amazon: Aecidium margaritariae on Margaritaria and Uromyces amapaensis on Jatropha

Oliveira, Patrícia Maria Piovezan; Sotão, Helen Maria Pontes; Freire, Gabriely Serrão; Monteiro, Josiane Santana

doi:10.1590/1809-4392202100441

Cited by 1 publication

(2 citation statements)

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“…Physic nut is an oleaginous plant with high oil content, making it ideal for industrial use, especially in biodiesel production. Nevertheless, few studies have been carried out on rust in this crop species worldwide [7,9,29]. In this study, the rust pathogen associated with this problem in Ecuador was morphologically characterized and the rust intensity on six physic nut genotypes was evaluated under field and semi-controlled conditions on adult plants and seedlings, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Although the species Uromyces amapaensis and P. jatrophicola have been reported to cause rust on Jatropha spp. (Euphorbiaceae), only the latter has been described on diseased leaves of physic nut (J. curcas) plants [7,9,29]. The shape, pigmentation, and size (length and width) of the uredia, uredospores, telia, and teliospores observed by us in physic nut plants and seedlings are similar to those obtained by Díaz-Braga et al [9], Nolasco-Gúzman et al [7], and Haituk et al [8], who describe P. arthuriana as the causal agent of rust in physic nut plants.…”

Section: Discussionmentioning

confidence: 99%

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Elucidating the Etiology and Temporal Progress of Rust on Physic Nut Genotypes and Their Relationship with Environmental Conditions in Ecuador

Donoso-Alvarado,

Flores-Anchundia,

Mendoza

et al. 2024

Agronomy

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Physic nut (Jatropha curcas L.) has emerged as a promising fruit crop in Ecuador, but the recent identification of rust poses a potential threat to its productive development. This study focused on elucidating the morphological aspects of the basidiomycete and assessing rust intensity across different canopy levels of physic nut hybrids and genotypes under field and semi-controlled conditions in Manabí, Ecuador. For the first time, this study confirms that Phakopsora arthuriana should be responsible for rust on physic nut in Ecuador based on the characteristics of the fungal structures. Rust incidence was 100% across all canopy layers, with the lower and middle canopies exhibiting higher severity and lesion numbers than the upper canopy. Using the Weibull nonlinear distribution model, we epidemiologically modeled disease progression, revealing that hybrid JAT 001100 displayed the highest temporal progress, recording 15% severity and an area under the disease progression curve of 3228.9 units. Promising genotypes CP-041 and CP-052 demonstrated lower rust intensity. Environmental parameters, including dew point, temperature, precipitation, and relative humidity, were correlated with rust severity and lesion numbers. In greenhouse assays, hybrid JAT 001165 showed higher severity, whereas JAT 001103 and JAT 001164 had more lesions than other genotypes. In contrast, promising genotypes CP-041 and CP-052 consistently exhibited lower rust intensity in both field and greenhouse environments. This study demonstrated that P. arthuriana could be epidemiologically modeled with the Weibull model, providing crucial insights into the dynamic interplay between rust infection and physic nut hybrids and genotypes under diverse conditions in the Manabí region of Ecuador.

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Section: Discussionmentioning

confidence: 99%