Silicon via nutrient solution modulates deficient and sufficient manganese sugar and energy cane antioxidant systems

et al. 2022

Sci Rep

Self Cite

Forages are one of the most cultivated crops in the world. However, nutritional deficiency is common, specifically in N, P, and Ca in many forage-growing regions. Silicon (Si) can attenuate the stress caused by nutritional deficiency, but studies on Si supply’s effects on forage plants are still scarce. This research was carried out to evaluate whether the Si supply can mitigate the effects of N, P, and Ca deficiencies of two forages and the physiological and nutritional mechanisms involved. Two experiments were carried out with two forage species (Urochloa brizantha cv. Marandu and Megathyrsus maximum cv. Massai). We used nutrient solution under balanced nutrition conditions and nutritional stress due to the lack of N, P, and Ca combined with the −Si and +Si. The deficiencies of N, P, and Ca in both forages’ cultivation caused damage to physiological and nutritional variables, decreasing the plant dry matter. However, in both forage species, the Si addition to the nutrient solution decreased the extravasation of cellular electrolytes and increased the content of phenolic compounds, the green colour index, the quantum efficiency of photosystem II, the efficiencies of use of N, P and Ca and the production of shoot dry matter. The beneficial effects of Si were evidenced in stressed and non-stressed plants. The research emphasised the advantage of using Si to grow U. brizantha and M. maximum under N, P, and Ca deficiency, contributing to their sustainable cultivation.

Section: Discussionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Silicon mitigates nutritional stress of nitrogen, phosphorus, and calcium deficiency in two forages plants

Araújo

Teixeira

et al. 2022

Sci Rep

Self Cite

“…The role played by silicon as a facilitator of the balance of mineral nutrients in the plant and a mediator of morphological and biochemical changes [103,104] may explain the increase in plant growth even without nutritional stress. Furthermore, high levels of Si in the shoots, such as those found in this study, favor the expression of the bene ts of Si to plants, with recent studies reporting production gains due to stoichiometric balance and e ciency in the use of macronutrients such as N and P in different species cultivated without stress, such as forage plants cultivated in a hydroponic system [36,44] , sugarcane [105,37] , and sorghum [106] .…”

Section: Discussionmentioning

confidence: 60%

“…Thus, it is important to supply Si for crops with low solubility sources, such as steel slags in the form of solid calcium silicate, which are incorporated into the soil [33,34] . However, the application of Si in forages (through sodium and potassium silicate) has been shown to be more e cient through fertigation [35][36][37][38] ,…”

Section: Introductionmentioning

confidence: 99%

Nanosilica modulates C:N:P stoichiometry attenuating phosphorus toxicity more than deficiency in Megathyrsus maximus cultivated in an Oxisol and Entisol

Melo

Amaral

et al. 2022

Preprint

Silicon (Si) nanoparticles can attenuate nutritional disorders caused by phosphorus in forages through nutritional homeostasis. This paper aims to evaluate the effects of P deficiency and toxicity in Megathyrsus maximus cultivated in two types of soils and to verify whether Si application via fertigation can mitigate these imbalances. The following two experiments were carried out: cultivation of forage plants in pots with Entisol and Oxisol, in a 3 x 2 factorial design, with three nutritional levels of phosphorus (deficient, adequate, and excessive) and two Si concentrations in the irrigation water (0 and 1.5 mmol L-1). Height, number of tillers, rate of leaf senescence, dry matter production, C:N, C:Si, C:P, and N:P ratios; and C, P, and N use efficiencies were evaluated in two growth cycles. P imbalances hampered carbon assimilation, C:N:P homeostasis, and dry matter production. Nanosilica fertigation promoted silicon uptake, improving C:N:P homeostasis and nutritional efficiency in plants under P deficiency and toxicity. Leaf senescence showed a lower value with addition of Si in plants grown in Oxisol in the three nutritional states of P. Silicon attenuated the stress caused by P toxicity in Entisol and Oxisol, improving production in plants without nutritional stress in Oxisol. The supply of Si nanoparticles in the cultivation of grass forage can contribute to a more efficient and sustainable use of phosphorus in pastures.

“…Bene cial elements supply, such as silicon (Si), has been used to favor plant development. This element can favor crop growth, with or without stress 7,8 due to its physiological bene ts, increasing photosynthetic pigment biosynthesis, strengthening the antioxidant defense system, and favoring photosynthetic e ciency, a fact observed in different species [9][10][11][12] , including sugarcane 13,14 . Furthermore, Si bene ts are favored in sugarcane because the crop has a high root uptake e ciency regarding this element [15][16][17] .…”

Section: Introductionmentioning

confidence: 99%

New strategy for silicon supply through fertigation in sugarcane integrating the pre-sprouted seedling phase and field cultivation

Silva

Alves

et al. 2022

Preprint

Adopting a Si supply strategy can amplify sugarcane response. Thus, this study aimed to verify whether Si supply in the pre-sprouted seedling (PSS) formation phase would have an effect after field transplanting similar to Si supply only in the field phase (via foliar spraying or fertigation), and whether Si supply in the PSS formation phase associated with Si fertigation after transplanting can potentiate or amplify Si benefits. Two experiments were conducted. In experiment I, PSS were grown in nursery without Si (Control) and with Si. Experiment II was conducted in the field on Eutrustox with the following treatments: no Si supply (Control); Si supplied during the PSS formation phase; Si supplied through foliar spraying in the field; Si supplied through fertigation in the field; and Si supplied in the PSS formation phase and during field development. Silicon use in both crop phases benefited sugarcane by increasing photosynthetic pigment content and the antioxidative defense system. The innovation of Si management to be supplied via fertigation integrated in both crop phases (PSS and in the field) optimizes the element use by increasing the crop's productivity and sustainability.