Selenium and agricultural crops

In Vitro Evaluation of the Inhibitory Activity of Different Selenium Chemical Forms on the Growth of a Fusarium proliferatum Strain Isolated from Rice Seedlings

“…Significant differences in radial growth reduction in F. proliferatum strain PG-C colonies relative to the untreated control (0 mg kg −1 of Se) were detected both within a form for different concentrations and within a Se concentration for different Se form Focusing the attention on Se from selenite (Figure 3), the inhibitory activity of 5 mg k concentration was significantly lower (p < 0.05) than those caused by all oth concentrations, whereas Se concentrations of 15, 20, and 100 mg kg −1 showed significantly higher inhibitory activity (p < 0.05) than the concentration of 10 mg kg −1 . T same significant (p < 0.05) gradient described for selenite was observed for Se-Met (Figu (5,10,15,20, and 100 mg kg −1 ) from sodium selenite (selenite; red circles), sodium selenate (selenate; blue squares), selenomethionine (Se-Met; green up-triangles), and selenocystine (Se-Cys; black down-triangles) on Fusarium proliferatum strain PG-CH1 colony development. The inhibitory activity was measured after 10 days of incubation at 22 ± 2 • C in the dark and expressed as the mean (± standard error) of colony radial growth reduction (%) relative to the untreated control (0 mg kg −1 of Se), calculated according to the equation: (radial growth control − radial growth treatment ): radial growth control × 100.…”

“…To improve clarity, please note that the ramification was considered for radial growth measurement. Data relative to radial growth reduction in F. proliferatum strain PG-CH1 colonies concerning the untreated control (0 mg kg −1 of Se), measured after 10 days of incubation at 22 ± 2 • C in the dark in the presence of various Se concentrations (5,10,15,20, and 100 mg kg −1 ) from different Se forms (selenite, selenate, Se-Met, and Se-Cys), are summarized in Figure 3. morphological modifications were macroscopically more appreciable in the presence lower Se concentrations (5-10 mg kg −1 ) that allowed a certain colony developme Interestingly, the presence of Se from selenate induced a considerable myceliu ramification (Figure 2b) that was not detected in the presence of Se from other chemic forms.…”

“…In addition to humans and animals, Se is also beneficial to plants when applied at low concentrations [5][6][7][8]. For example, Se contributes to the control of water status [9], prevents oxidative stress, delays senescence, and promotes growth [10]. Due to this experimental evidence, numerous studies have investigated Se-biofortification strategies for providing plant protection against abiotic stresses and, at the same time, when possible, beneficial food for human health [11][12][13].…”

“…Due to the global importance of both F. proliferatum and the host (rice) from which it has been isolated, and because, to the best of our knowledge, no studies have been conducted on the effect of Se against F. proliferatum, in the present study we investigated the in vitro effect of various Se concentrations (5,10,15,20, and 100 mg kg −1 of Se) from four different Se chemical forms (sodium selenite, sodium selenate, selenomethionine (Se-Met), and selenocystine (Se-Cys)) on the development of a F. proliferatum strain isolated from rice seedlings. Additionally, a Se speciation analysis was performed to obtain information on the occurrence of Se metabolites and their distribution, as a consequence of Se bioconversion operated by the fungus.…”

Nanopartículas de selenio absorbidas en hidrogeles de quitosán-polivinil alcohol en la producción de pepino injertado

“…Hay evidencia en la literatura de que el Se puede mejorar la productividad de la planta a través de la mejora de la fotosíntesis, ya que este proceso se estimula en las plantas mediante la suplementación óptima (Gilmara et al, 2017), por otro lado el selenio podría provocar síntomas de la toxicidad a dosis más elevadas que influyen en el crecimiento de la hoja y número y tamaño de estomas del pepino, y en la asimilación de concentración interna de CO2 (Haghighi et al, 2016), este efecto en la maquinaria antioxidante sugiere que con las concentraciones apropiadas de Se podría mejorar significativamente la fotosíntesis.…”