Cytokinin-Regulated Physiological Parameters Affected by an Exogenous Dopamine Spray in Brussels Sprout (Brassica oleracea var. gemmifera)

Abstract

Root restriction on the first stage of seedling growth decreases post-transplant biomass accumulation. Several studies in different vegetables and ornamental plants have suggested that this restriction would be overcome by means of a single 6-benzylaminopurine (BAP) spray. Based on this, the aim of this work was to evaluate the effects of both pre-transplant single BAP and dopamine (a cytokinin antagonist) sprays on the growth of Brussels sprout (Brassica oleracea var. gemmifera) plants grown in 200 plug cells tray-1, during different times of the annual cropping period. The responses of dopamine-sprayed plants were not completely similar to those previously reported. The different physiological processes studied in dopamine-sprayed plants through some growth parameters showed that dopamine affected mainly the rate of leaf appearance, which in turn positively affected both individual and total leaf area expansion. Dopamine-sprayed plants showed a higher leaf source, which allowed them to accumulate a higher biomass on both a fresh and dry weight basis during the initial vegetative growth stages. The effects of both BAP and dopamine were partially related to the environmental conditions during the experiments.

Involvement of cytokinins in biomass accumulation of Limonium sinuatum under root restriction during nursery

“…These authors showed that exogenous dopamine increased the content of glucose and fructose by increasing the expression of sucrose phosphate synthase, cell wall invertase and neutral invertase. However, previous data in Brussels sprouts indicated that dopamine spraying did not modify the root:shoot ratios (Miglioli et al, 2020).…”

“…One possibility is to use endogenous inhibitors of cytokinin synthesis such as dopamine (Van Staden et al, 2008). Although there is little information on the effects of the exogenous spraying of plants with dopamine, most studies mention that dopamine works as a stimulant rather than as an inhibitor of metabolism, to compensate for situations of hydric, saline, thermal and nutrient stress (Jiao et al, 2019(Jiao et al, , 2021Gao et al, 2020;Lan, et al, 2020;Liu et al, 2020a, b;Miglioli et al, 2020;Wang et al, 2021).…”

“…The effect of dopamine spraying on the abiotic stress generated by cell size in the propagation tray during nursery has only been evaluated in Brussels sprouts (Miglioli et al, 2020). On the other hand, Liu et al (2020a) indicated that the ability of dopamine to promote plant growth is determined by plant-specific interactions with growth hormones and that, since the endogenous dopamine content varies significantly among different plant species, dopamine function may also vary from plant to plant.…”

Stochastic predetermination of bioproductivity component by the growth features of winter wheat upper leaf blades

“…J.L. Miglioli et al (2020) demonstrated that a decrease in RGR, NAR, an increase in DM of Brassica oleracea var. gemmifera was caused by treatment with 6-benzylaminopurine, while the opposite changes were caused by dopamine.…”

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“…J.L. Miglioli et al (2020) demonstrated that a decrease in RGR, NAR, an increase in DM of Brassica oleracea var. gemmifera was caused by treatment with 6-benzylaminopurine, while the opposite changes were caused by dopamine.…”