Biochemical responses in ‘Kent’ mango grown in Brazilian semi-arid region under different doses of triacontanol

ABSTRACT The management adopted for the mango crop requires that, at a certain stage, the irrigation depth should be reduced to promote a more uniform flowering. In regard to that, it is necessary to introduce new alternatives that mitigate the harmful effects of abiotic stress and that promote greater fruit yield. Therefore, the present study aimed to evaluate the influence of triacontanol on the levels of organic solutes, antioxidant enzymatic activity, and production of ‘Kent’ mango under Brazilian semi-arid conditions. The experiment was carried out for two consecutive years, 2018 and 2019, in a commercial orchard located at the DAN Farm, Petrolina-PE. The experimental design used was randomized blocks, with five treatments and four replications, evaluating four plants per plot. The treatments consisted of triacontanol doses: 0 (control treatment), 3.75; 7.50; 11.25, and 15.00 ppb per plant. Two consecutive harvests (2018 and 2019) were evaluated during the stages of branch maturation (2019 only), floral induction, full flowering, and initial fruiting. Foliar application of triacontanol positively favored the contents of total amino acids, free proline, total proteins, and activity of the enzymes superoxide dismutase (SOD), ascorbate peroxidase (APX), and catalase (CAT). There was an increase in production of 50.85% (dose - 11.25 ppb) and 64.95% (dose - 10.50 ppb) in the 2018 and 2019 crop years, respectively.

摘要：芒果栽培的常规管理规程要求，在特定生育阶段需降低灌溉水深，以促进花期均匀一致。有鉴于此，亟需开发可缓解非生物胁迫危害并提升果实产量的新型调控技术。为此，本研究旨在评估巴西半干旱环境下，三十烷醇（triacontanol）对‘肯特’芒果有机溶质水平、抗氧化酶活性及果实产量的影响。本试验于2018至2019年连续两年，在巴西佩特罗利纳市（PE州）DAN农场的商业芒果园开展。试验采用随机区组设计，设置5个处理、4次重复，每小区定植4株供试芒果植株。供试处理为不同浓度的三十烷醇：0 ppb（空白对照）、3.75、7.50、11.25及15.00 ppb，每株施用对应剂量。试验分别于枝条成熟期（仅2019年开展测定）、花芽诱导期、盛花期及坐果初期，对2018、2019两个连续种植季的收获产量进行评估。叶面喷施三十烷醇可显著提升供试芒果的总氨基酸、游离脯氨酸及总蛋白含量，并增强超氧化物歧化酶（SOD）、抗坏血酸过氧化物酶（APX）与过氧化氢酶（CAT）的活性。2018与2019作物季的果实产量分别较对照提升50.85%（施用11.25 ppb三十烷醇处理）与64.95%（施用10.50 ppb三十烷醇处理）。