Exogenous spraying of plant’s resistance inducers improves yield and sugarcane quality

Ronaldo da Silva Viana1, Bruno Rafael de Almeida Moreira1, Lucas Aparecido Manzani Lisboa1,2, Paulo Alexandre Monteiro de Figueiredo1, Sérgio Bispo Ramos1, Samuel Bispo Ramos1, Gustavo Henrique de Oliveira Dias2, Leticia Cunha Moreira2, Mariana Teixeira Spotoni2, Camila Regina Silva Baleroni Recco2
1 São Paulo State University (Unesp), College of Technology and Agricultural Sciences, Dracena, 01049-010 São Paulo, Brazil
2 Educational Foundation of Andradina (FEA), Integrated College Stella Maris (FISMA), Andradina, 01049-010 São Paulo, Brazil

Abstract

Viana, R. S., Moreira, B. R. A., Lisboa, L. A. M., Figueiredo, P. A. M., Ramos, S. B., Ramos, S. B., Dias, G. H. O., Moreira, L. C., Spotoni, M. T., & Recco, C. R. S. B. (2019). Exogenous spraying of plant’s resistance inducers improves yield and sugarcane quality. Bulgarian Journal of Agricultural Science, 25(5), 833–844

Sugarcane crop is important to sugar-energy industry. Thus, the aim of this study was to evaluate yield and technological quality of Sugarcane juice obtained from the SP81-3250 variety following exogenous spraying of resistance inducers. The experiment consisted of a randomized block design with four replicates per treatment: salicylic acid (0, 5, 10, 20, and 40 µM) and acibenzolar-S-methyl (0, 0.2, 0.4, 0.8 and 1.6 g 100 L-1). The resistance inducers were sprayed using CO2-pressurized sprayer. Sugarcane tillage was harvested thirty-days after the spraying of resistance inducers and stalks were milled for juice samples extraction, in which were evaluated the following parameters: °Brix, Pol, purity, reducing sugars (RS), total reducing sugars (TRS), theoretical sugar recoverable (TSR), fibres and yields of sugar and stalks. Obtained data was submitted to following statistical tests (P < 0.05): Shapiro-Wilk’s normality, Fisher’s variance, regression, and Pearson’s linear correlation. Results showed that quadratic trends rejected null hypothesis for almost all parameters. Salicylic acid levels till 10 µM increased °Brix, Pol, purity, TRS, TSR contents and sugar and stalks yield. However, 20 and 40 µM showed negative effects on juice technological quality and agronomic performance. Therefore, the elicitors improved photosynthetic characteristics and sugarcane physiological maturation. It was concluded that salicylic acid and acibenzolar-S-methyl levels till 10 µM and 0.8 g 100 L-1, respectively, are recommendable to management of SP81-3250 variety.

Keywords: acibenzolar-S-methyl; phytohormones; plant resistance; inducers; salicylic acid; Saccharum spp.

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