Application of silicon to irrigated and water deficit sorghum plants increases yield via the regulation of primary, antioxidant, and osmoregulatory metabolism

Magalhães, P. C.; Silva, Eder Marcos da; Souza, Kamila Rezende Dázio de; Campos, Cleide Nascimento; Alvarenga, Amauri Alves de; Souza, Thiago Corrêa de

doi:10.1016/j.agwat.2021.107004

Cited by 24 publications

(17 citation statements)

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“…These results demonstrate that sugarcane has a less efficient enzymatic antioxidant detoxification mechanism than energy cane, that is, the first is more sensitive to water deficit. Ascorbate peroxidase activity was also higher in sorghum plants under water deficit 14 .…”

Section: Discussionmentioning

confidence: 89%

“…Plants treated with Si also have higher water content due to the contribution of this element in root water uptake. Silicon induced an increase in water potential through the osmoregulatory action of proline 13 , 14 . Allied to this, the activity of aquaporins was also likely to have increased.…”

Section: Discussionmentioning

confidence: 99%

“…5 g, h), confirming the stress condition. Previous studies report the accumulation of free amino acids in plants under drought 14 , 17 , 61 as a strategy to raise osmotic pressure, thus being an osmoregulatory mechanism 62 .…”

Section: Discussionmentioning

confidence: 99%

“…5 e, f). The increased concentration of proline contributed to maintain cellular osmotic adjustment, increasing cell water potential by stimulating an increase in cellular homeostasis 14 . Proline can also act as a molecular chaperone, protecting the integrity of proteins and maintaining or increasing the activity of enzymes signaling ROS dissipation 74 .…”

Section: Discussionmentioning

confidence: 99%

“…This is because deposits of this element on cell walls reduce water loss by transpiration 13 . Silicon also induces an osmoregulatory response by modifying proline content that adjusts root hydraulic conductivity 14 . Moreover, it stimulates the activity of enzymes such as aquaporin 15 , increasing water absorption.…”

Section: Introductionmentioning

confidence: 99%

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Action of silicon on the activity of antioxidant enzymes and on physiological mechanisms mitigates water deficit in sugarcane and energy cane plants

Teixeira

Prado

Rocha

et al. 2022

Sci Rep

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Production of sugarcane and more recently of energy cane strengthen renewable bioenergy production capacity. However, droughts resulting from climate change have limited the production of these crops. One of the strategies to attenuate water deficit damage in these crops is the use of silicate, which contributes to plant physiology. This strategy is likely to increase water use efficiency, thus promoting crop sustainability. Notwithstanding, studies on this issue are still incipient. This study assesses whether Si applied via fertigation and foliar spraying in the seedling production phase and as a complement after seedling transplanting to the soil is efficient in attenuating water deficit in sugarcane and energy cane. The study further elucidates physiological and biochemical mechanisms involved in this process. For this, the authors conducted two experiments: one with sugarcane and the other with energy cane. Treatments were arranged in randomized blocks with 5 replications, in a 2 × 2 factorial scheme. Factors consisted of the absence (-Si) and presence of Si (+ Si) applied via fertigation and foliar spraying; and two water regimes: 70% (without water deficit) and 30% (severe water deficit) of the soil water retention capacity. Silicon was supplied during the formation phase of presprouted seedlings and during the transplanting of seedlings to pots filled with samples of Entisol (Quartzipsamment). In these pots, water regimes were induced from 7 to 160 days after transplanting. Severe water deficit reduced the water content and water potential of plants. This situation induced oxidative stress and impaired gas exchange and photosynthetic water use efficiency, reducing plant growth. Silicon supply via fertigation in association with foliar spraying in the seedling formation phase with complementation after transplanting was efficient in increasing Si accumulation in the plants. Silicon was effective in attenuating severe water deficit damage up to initial culm formation through mechanisms that maintain water and physiological balance by favoring the antioxidant defense system in sugarcane and energy cane plants.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 99%