Medicinal plants, since antiquity, have been relevant due to their therapeutic properties, are widely used for the prevention and treatment of diseases. However, the growth and production of these plants are impacted by a notorious environmental stressor, salinity. In this sense, this study aimed to review the impacts of salinity on plant development, the deleterious effects of this environmental stressor on the production of medicinal plants, and the production strategies of these species in saline conditions. Areas with salt excess problems have been increasing all over the planet, mainly due to human actions such as inadequate irrigation management. Salinity impacts plants at different times, the first phase results from osmotic stress, while the second derives from the ionic toxicity of the salt constituents. In medicinal plants, saline stress causes damage from germination to changes in morphological characteristics, physiology, nutrient concentration, and productivity. However, in some species, exposure to moderate degrees of salinity was positive for medicinal quality, with an improvement in the constitution of the essential oil. Strategies for the production of medicinal plants in saline conditions are reported in the literature, such as the use of amino acids (such as proline and betaine glycine), salicylic acid, arbuscular mycorrhizal fungi, resistance inducing genes, and projected nanoparticles. These strategies may represent an option for agricultural production in marginal areas and with waters with higher levels of salts.
Salinity is one of the major obstacles to agriculture in semi-arid regions, as it affects the physiological processes, growth, and yield of numerous crops. Hence, the application of salt stress attenuators is of paramount importance, as it enables the use of saline water for agricultural purposes. Among these, humic acid promotes the growth as well as water and nutrient uptake of plants. To this end, the present study evaluated the effects of humic acid on the growth and physiology of Carica papaya seedlings irrigated with saline water. The experiment followed the randomized block design with five levels of electrical conductivity (0.5, 1.15, 2.75, 4.35, and 5.0 dS m-1) and five concentrations of humic acid (0.5, 0.94, 2.0, 3.06, and 3.5 mL L-1). Growth, gas exchange, chlorophyll content, and chlorophyll a fluorescence were evaluated. Irrigation with 4.9 dS m-1 water and application of 3.05 mL L-1 humic acid promoted the growth of papaya seedlings. Irrigation with high-salinity water (4.96 and 3.09 dS m-1) coupled with the application of 3.05 and 2.21 mL L-1 humic acid increased internal CO2 concentration, transpiration, instantaneous water use efficiency, carboxylation efficiency, and chlorophyll b content. Overall, humic acid (3.5 mL L-1) attenuated the deleterious effects of salt stress, promoting the growth and improving the performance of papaya seedlings under moderate salinity (4 dS m-1).
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O milho (Zea mays L.), é uma cultura de grande importância para o mundo. Dentre os grandes produtores dessa comoditie, destaca-se os Estados Unidos, China e Brasil. Visto o alto valor comercial do milho, tecnologias vem sendo empregadas no processo de produção, como a utilização de bioestimulantes. Nesse sentido, esse estudo objetivou revisar o conhecimento atual sobre os efeitos dos bioestimulantes na cultura do milho, em especial, o extrato de algas e extrato pirolenhoso, destacando a resposta direta ou indireta do vegetal quando utilizado esses tipos de substâncias. Diversos estudos de pesquisa já enfatizam a relevância do potencial de algas para uma melhor eficiência na produção agrícola, sendo fortes influenciadores ativos no crescimento da planta, visto sua aptidão de produzir ou interagir com os fitohormônios da planta, proporcionando ainda, um melhor desenvolvimento do sistema, maior vigor e aumento da produtividade. Por sua vez, o extrato pirolenhoso é um produto natural obtido da queima da madeira e utilizado como condicionador do solo, indutor de enraizamento, repelente de insetos pragas e outras funções que diminuem a utilização de defensivos agrícola no sistema de cultivo, sendo um bioestimulante com forte tendência no mercado. Os bioestimulantes apresenta-se como um potencial insumo alternativo para o incremento no crescimento e desenvolvimento de plantas de milho, contudo, entende-se que novas pesquisas são necessárias, com o intuito de fornecer melhores informações de interesses agronômicos.
Maize (Zea mays) is a cereal widely used in human and animal feeding worldwide, with great socioeconomic importance. This study aimed to evaluate the growth, productivity, and absorption of macro and micronutrients of maize under the application of biostimulant, sulfur, and zinc in a Gleisolo Háplico soil in a microclimate region of the semiarid state of Paraíba, Brazil. The experiment was carried out in a complete randomized block design, a 2x2x2 factorial scheme with eight treatments, and four replications was used. The first factor corresponded to treatment with biostimulant (Presence and absence); the second to sulfur (Presence and absence); and the latter to zinc (Presence and absence). Growth, yield, and macro and micronutrient absorption data were evaluated. Data were submitted to analysis of variance and the means compared by the Tukey test at 5% probability. The number of rows per ear and ear diameter responded positively when the biostimulant was used. Maize under foliar fertilization with zinc nitrate did not show yield increase. The application of sulfur promoted an increase in almost all variables, including yield. The combined application of the three products influenced only the number of rows per ear. The application of sulfur separated or together with biostimulant provided an increase in the absorption of some nutrients by the leaf such as copper, N and K. As a result of fertilization with sulfur, which provided an increase in leaf absorption, mainly of N, also promoted a significant increase in all student variables, including grain productivity.
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