Glyphosate Plus Carboxylic Compounds Boost Activity of Free Radical-Scavenging Enzymes in Sugarcane

Abstract

Drought, heat, and salinity, as well as pests, are stressing agents, which have impressively declined the productivity and quality of sugarcane crop in harsh environments. Our study aimed to examine the effect of various chemical ripeners as alternatives to enhancing the reactiveness of the enzymatic antioxidant system of sugarcane crop. The field experiment consisted of spraying the ingredients, ethephon, ethyl-trinexapac, glyphosate, carboxylic compounds (MTD) and methyl-sulfumeturon on the Brazilian commercial varieties, SP80-1842 and SP80-3280, before flowering stage. The enzymatic assay comprised the monitoring of the rate of degradation of free radical by ascorbate peroxidase (APX), catalase (CAT), peroxidase (POD) and superoxide dismutase (SOD) in the extract from leaves of 11-month-old plants. Spraying glyphosate at 0.15 L ha−1 with MTD at 1.00 L ha−1 provided the highest activity of CAT, 0.65 µmol H2O2 min−1 mg−1 protein, in variety SP80-1842 Spraying glyphosate at 0.15 L ha−1 with ethephon at 0.33 L ha−1 caused the highest activity of APX, 1.70 nmol ascorbate min−1 mg−1 protein, in variety SP80-3280. The conclusion is, therefore, that mixtures of glyphosate with the insecticide/acaricide, MTD, and with the synthetic ethylene-releasing product, ethephon could help sugarcane crop grow adequately under uncontrollable or unpredictable agroecosystems like marginal lands.

Sugarcane Plant Growth and Physiological Responses to Soil Salinity during Tillering and Stalk Elongation

“…They reported that the tolerant genotypes expressed better stability in these parameters than the sensitive genotypes [17]. Moreira et al [18] in 2020 found that spraying solutions consisting of glyphosate with the carboxylic compounds (MTD) insecticide and ethephon are the most technically effective way to enhance sugarcane performance adequately under uncontrollable or unpredictable agro-ecosystems for natural ripening in marginal lands with drought, heat, salinity, and other unfavorable conditions.…”

Assessing Drought, Flood, and High Temperature Disasters during Sugarcane Growth Stages in Southern China

“…Such negative effects mainly refer to extreme weather events, e.g., drought, flood, and high temperatures [2,[5][6][7]. Due to the long life cycle of sugarcane [8], its growth and yields are objectively affected by drought and flooding stresses [9][10][11][12], as well as high temperatures [13,14]. Given these concepts, it is considered that the most challenging problems induced by climate change for sugarcane production are extreme meteorological disasters [2].…”

“…China is the third largest sugarcane-producing country in the world, following Brazil and India [14,15]. In China, sugarcane-producing areas are concentrated in southern China (SC for short), since the warm climate in SC is suitable for the growth and development of such tropical plants.…”