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Effects of Plant Growth Regulators on Sugarcane Productivity and Quality of the Art Through the Increase in Photosynthetic and Antioxidant Activity

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Abstract

The foliar application of plant growth regulators to sugarcane can increase crop growth and yield per cultivated area, improve crop productivity and quality, and mitigate possible abiotic stresses by optimizing photosynthesis. The productive potential of sugarcane has not been fully tapped, and plant growth regulator technology via foliar application could greatly benefit the production of food and renewable energy from the sugarcane production chain. In this study, we conducted 15 sugarcane field trials to evaluate the effects of plant growth regulators (17 ppm GA3 activity, 817 ppm IAA activity and 43 ppm zeatin) via foliar application at the vegetative stage (V) or vegetative and maturation stages (VM) on the photosynthetic and antioxidant enzyme activities, carbohydrate production and yield production of three harvest periods (early, mid-late and late harvest sugarcane). In general, foliar application increased the enzymatic, agronomic, quality and energy parameters of sugarcane. The application of plant growth regulators in V and VM increased the activities of the photosynthetic enzymes phosphoenolpyruvate carboxylase and ribulose-1,5-bisphosphate carboxylase-oxygenase, decreased the contents of malondialdehyde and hydrogen peroxide, and increased superoxide dismutase, catalase, ascorbate peroxidase, and proline content. The average stalk yield over the three harvest times increased by 5.4 and 8.0% in V and VM, respectively, compared to the control (101 Mg ha−1). In addition, V and VM increased the sucrose concentration, theoretical recoverable sugars (TRS), and sugar productivity by averages of 2.9%, 2.6% and 9.3%, respectively compared to the control (13.9% of sucrose, 139 kg sugar stalk−1 of TRS, and 13.9 Mg ha−1 of stalk yield), across all harvest seasons. The best results for straw, bagasse and energy production were observed in VM, with average increases of 8.0%, 7.7% and 8.0% compared with the control (14.1 Mg ha−1, 6.1 Mg ha−1 and 69.8 kWh, respectively). Thus, plant growth regulator application can increase sugarcane metabolism, growth and development. Although single plant growth regulator application in the vegetative stage improved all sugarcane parameters, the double application of plant growth regulators in the vegetative and maturation stages ensured improvements in yield and product quality.

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Acknowledgements

The first author received a scholarship from the CAPES (Coordination for the Improvement of Higher Level Personnel—Finance Code 001). The authors thank the BP Bunge Bioenergia (Moema sugar mill), COCAL (Paraguaçu Paulista sugar mill), COFCO International Brasil S.A. (Potirendaba sugar mill), Delta Sucroenergia S.A. (Delta sugar mill), Raízen (Barra sugar mill and Santa Elisa sugar mill), Santa Terezinha (Umuarama sugar mill), São Martinho (São Martinho sugar mill), and Tereos (Cruz Alta sugar mill) groups for providing the experimental areas and analytical support. The fifth author would like to thank the National Council for Scientific and Technological Development (CNPq) for an award for excellence in research.

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Design the experiment: CACC. Obtain and process the data: CMH, APAPF and LMJ. Analyze the data: CMH and APAPF. Wrote the paper: CMH, APAPF and LM with contribution of all co-authors. All authors confirm being contributor of this work and has approved it for publication.

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Correspondence to Carlos Alexandre Costa Crusciol.

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de Morais Hervatin, C., de Almeida Prado Filho, A.P., Momesso, L. et al. Effects of Plant Growth Regulators on Sugarcane Productivity and Quality of the Art Through the Increase in Photosynthetic and Antioxidant Activity. J Plant Growth Regul (2024). https://doi.org/10.1007/s00344-024-11354-3

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  • DOI: https://doi.org/10.1007/s00344-024-11354-3

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