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.
Highlights
Experts in systematics and taxonomy classify sugarcane (Saccharum sp.) into the familyPoaceae
Superoxide dismutase is one of the most effective antioxidant enzymes to alleviate the negative effects of reactive oxygen species (ROS) on crop plants under stressing environments like drylands [18,30,31]
Gomathi and Rakkiyapan [12] reported that superoxide dismutase (SOD) significantly reduced the lipid peroxidation and degradation of the cellular membrane by water stress by flooding and salinity in the commercial varieties of sugarcane, CO 8371, CO 86032, CO 99004 and CO 99006
Summary
Experts in systematics and taxonomy classify sugarcane (Saccharum sp.) into the familyPoaceae. It provides the staggeringly rising world population with food, biofuels for transportation and feeding of power plants, as well as fine chemicals. Agriculture 2020, 10, 106 forage for ruminants and non-ruminants, and the real possibility of recycling of filter cake and stillage into harmless, inexpensive bio-fertilizers [1,2]. It is one of the most physiologically effective, most reliable and most affordable biosystems in mitigating the emissions of greenhouse gases into the atmosphere. It has great potential in creating employment opportunities and, modernize rural communities across low-income and high-income countries [3]
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