Àcidos húmicos e ácidos fúlvicos na indução de resistência ao estresse salino na cultura do morango

Abstract

Abiotic stresses cause numerous harms such as crops, such as limiting plant growth and declining plant productivity. Saline stress is one of the main villains of limitations. The strawberry is a fruit consumed worldwide, rich in nutrients and flavonoids, has antioxidant properties, and high demand by the population. The need for increased productivity and the search for plants more tolerant to abiotic stresses is an urgent demand. In this sense, employees employed in the culture of organic tissues, as they speed up studies helping to understand the process and consequently contributing to plant breeding. Among the resistance inducers or products that mitigate these studied stresses, we highlight the use of microorganisms such as rhizobacteria, nutrients such as silicon, biofertilizers, and organic acids, such as humic and fulvic acids. The objective of the work was to investigate whether humic acids and fulvic acids promote resistance to salt stress in strawberry plants. The induction of salt stress in the seedlings was carried out in vitro, afterwards, as the plants were taken to the greenhouse and grown under stress to verify possible efficiency of the process. The activity of catalase, superoxide dismutase, ascorbate peroxidase and the occurrence of lipid peroxidation was analyzed. The accumulation of chlorophylls and carotenoids, and the accumulation of macronutrients and micronutrients. In addition to the growth analysis of shoot length, root system, number of shoots and leaves, dry matter. The data were discovered on the test and when tested for regression analysis. In view of the results, it was possible to verify that the concentration of salt used in vitro was sufficient to cause stress in plants. There was a direct relationship between the increased needs for humic and fulvic acids and increased activity of the plant defense system in response to the planned salt during seedling growth in the greenhouse, suggesting that plants developed in vitro in the presence of acids to biotic stress more quickly. The acids also had a positive effect in increasing the chlorophyll content of the seedlings exposed to stress. We conclude that humic and fulvic acids can be used in vitro to produce strawberry seedlings that are more responsive to salinity stress. The gradual increase of both acids increases the response of plants to stress.