Extrato de alga Ascophyllum nodosum em mudas de Inga edulis Mart. sob restrição hídrica e no pós-estresse

Abstract

Studies with the aim of alleviating the effect of water stress, such as the deficit, on seedlings have increased, and the use of seaweed extract has been a sustainable and promising alternative. Thus, the aim was to evaluate the role of Ascophyllum nodosum L. seaweed extract (ANE) in I. edulis seedlings during water restriction and on post-stress. The seedlings were cultivated under the following treatments: control (daily irrigation), water restriction - WR (irrigation suspension), WR + 15 mL L-1 of ANE, WR + 30 mL L-1 of ANE, and WR + 45 mL L -1 of ANE, and evaluated in two periods: i) SWD - when the seedlings showed symptoms of water deficit (SWD) and ii) recovery - resumption of irrigation for 60 days (REC). The seedlings that received 15 mL of ANE showed SWD at 21th WR, while those in WR, and WR + 45 mL of ANE tolerated it for 48 days. The seedlings during WR without ANE up to 21 days do not reduce the photochemical and growth characteristics, while in REC, they do not recover similarly to the control. The application of 30, and 45 mL L-1 of ANE contributed on post-stress, favoring photochemical yields, biomass increment and seedling quality, in addition to increasing the potential for phenotypic plasticity. Although the application of ANE does not substantially favor the SWD phase, it contributes to the REC, becoming a promising practice.