Physiological and Growth Responses in the (Schizolobium amazonicum Huber ex Ducke) Seedlings Subjected to Cadmium Doses

Abstract

The aim of this work was to evaluate, by the physiological and growth variables, the behavior of paricá seedlings submitted to cadmium aplications. Cadmium is a importante metal due the industrial use, the accumulation in the environment, the high mobility in the soil-plant system, and possibly by changing physiological and growth parameters in plants. Among the plants that can be affected by this metal is the species (Schizolobium amazonicum Huber ex Ducke), known as paricá. Native from the amazona region, presents great social, economic and environmental potential. Among the physiological variables analyzed, cadmium interfered with photosynthesis, stomatal conductance and transpiration, mainly with the increase of the concentrations of this element. Among the correlated variables, the variable intrinsic efficiency of water use (EiUA), presented high in the stress conditions maintaining the minimum of water balance. For the growth variables, the cadmium provided a decrease in the height, diameter, number of leaves and leaflets influencing the low synthesis of photoassimilates. The phytotoxic element was mainly concentrated in the roots, but there was translocation to shoot, signaling a phytoextractive characteristic.

Crescimento e qualidade de mudas de Schizolobium parahyba var. amazonicum em substratos fertilizados

“…Para a determinação da massa seca da parte aérea (MSA) e a massa seca das raízes (MSR), as plantas foram coletadas e seccionadas em parte aérea e raiz. Por fim, foram acondicionadas em sacos de papel e encaminhadas a estufa de circulação de ar forçada a 70 ºC, até a obtenção da massa constante (Nogueira et al, 2019;Santiago et al, 2021).…”

A bibliographic review on Paricá (Schizolobium amazonicum Huber ex Ducke) and its relationship with the phytoremediation of environments contaminated by heavy metals

“…In another research conducted by Merces et al (2018), the behavior of Paricá was also tested before the effect of different doses of cadmium and corroborates with the results previously described, showing that the Paricá absorbed the metal in the roots, reducing its translocation to the shoot, which contributed to its high tolerance. Nogueira et al (2019) in their results obtained data on how cadmium in high concentration can affect several variables of Paricá such as photosynthesis, stomatal conductance, and transpiration. In the plant, the intrinsic efficiency of water use (EiUA) was the variable most affected by water stress, suffering from high concentrations of cadmium in environments with little water.…”

Influência da água sobre a germinação de sementes de Paricá (Schizolobium parahyba var. amazonicum Huber ex Ducke)

“…amazonicum Huber ex Ducke (Fabaceae) é uma árvore amazônica de grande porte, com rápido crescimento, heliófita, ocorre em florestas primárias e secundárias, de terrafirme e várzea alta, com distribuição no Brasil (Acre, Amazonas, Mato Grosso, Pará, Rondônia e o Distrito Federal) (Oliveira et al, 2019;Bardiviesso et al, 2020). A espécie possui elevado potencial econômico, sendo sua madeira empregada na produção de compensados, brinquedos, caixotaria leve e portas (Oliveira et al, 2019). Além disto, a espécie é utilizada em plantios comerciais e em sistemas de recuperação de áreas degradadas ou reflorestamento (Bardiviesso et al, 2020).…”

“…Devido as características da espécie e o elevado valor comercial, os plantios de Paricá são uma alternativa para suprir a demanda por madeira de qualidade (Oliveira et al, 2019). Entretanto, as sementes de Paricá possuem dormência tegumentar, que reduz a permeabilidade da semente, limitando as trocas gasosas e a expansão do embrião (Fernandes et al, 2019).…”