Abstract
Abstract The beneficial effect of silicon on plants is known, but there are no studies demonstrating the effect of this element on protein and lignin production in ornamental plants. This study aimed to assess the effects of monosilicic acid fertigation at 0, 2, 4, and 8 mmol L-1 of Si on protein and lignin production of two ornamental species: Viola x wittrockiana Gams ex Nauenb. & Buttler ‘Majestic Giants II Fire’ e Tagetes erecta L. ‘Hero’ (color mix). The experiment was installed in a 4 × 2 factorial arrangement using a completely randomized design with five replications. After 90 days of the sowing, we assessed N and Si contents in shoot system, Si accumulation in shoot system, root, and total, and lignin and protein production. An increase in lignin followed by its reduction was observed from the concentration of 2.0 (4.29) and 4.3 (5.72) mmol L-1 of Si for Viola and Tagetes species, respectively. Silicon application promoted higher lignin content in T. erecta and V. x wittrockiana.
Highlights
Si accumulation in shoot system, root, and total, and lignin and protein production
Silicon content Silicon content in shoot system increased until the concentration of 6.75 and 7.01 mmol L-1 of Si, reaching 12.11 and 11.16 mg kg−1 of Si in V.x wittrockiana and T. erecta, respectively, and stabilizing subsequently at these concentrations
An interaction effect was observed between species up to the concentration of 3 mmol L-1, where T. erecta was the species that most absorbed the nutrient at the lowest concentrations whereas, at the highest concentrations, V. x wittrockiana absorbed about 10% more when both species reached maximum production values (Figure 1A)
Summary
An increase in lignin followed by its reduction was observed from the concentration of 2.0 (4.29) and 4.3 (5.72) mmol L-1 of Si for Viola and Tagetes species, respectively. Silicon application promoted higher lignin content in T. erecta and V. x wittrockiana. EFFECT OF SILICON ON PROTEIN AND LIGNIN CONTENTS OF TWO ANNUAL FLOWER SPECIES a negative effect on nitrogen uptake (Botelho et al, 2005), which would lead to the same effect on protein production since 16% of the proteins are composed of nitrogen (Galvani and Gaertner, 2006). Considering that, our hypothesis is that silicon uptake increases lignin content in plant species, but not altering their protein content. This study aimed to quantify the Si effects on protein and lignin production in Viola x wittrockiana ‘Majestic Giants II Fire’ and Tagetes erecta ‘Hero’ (color mix)
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