Universidade Federal de Campina Grande - UFCG, Unidade Acadêmica de Engenharia Agrícola, Campina Grande, PB, Brasil.
Universidade Federal de Campina Grande - UFCG, Centro de Ciência e Tecnologia Agroalimentar, Pombal, PB, Brasil.
Braz J Biol. 2022 Jul 1;84:e261211. doi: 10.1590/1519-6984.261211. eCollection 2022.
To mitigate the deleterious effects of salt stress, substances capable of acting as mitigators and/or inducers of tolerance to stress have been used, enabling the use of saline waters and contributing to the development of irrigated agriculture. In this context, the aim of the present study was to evaluate the effect of foliar spraying with hydrogen peroxide as an attenuator of salt stress effects on soursop morphophysiology. The experiment was conducted under greenhouse conditions in Campina Grande - PB, Brazil, using a randomized block design, in a 4 × 4 factorial arrangement, whose treatments resulted from the combination of four levels of electrical conductivity of irrigation water - ECw (0.8 - control, 1.6, 2.4, and 3.2 dS m-1) and four concentrations of hydrogen peroxide - H2O2 (0, 10, 20, and 30 μM), with three replicates. Foliar application of hydrogen peroxide at a concentration of 10 µM increased growth, chlorophyll synthesis, and relative water content in the leaves and consequently reduced the foliar water saturation deficit of soursop irrigated with ECw up to 1.6 dS m-1. The concentration of hydrogen peroxide of 30 µM intensified the salt stress on the electrolyte leakage in the leaf blade and the photosynthetic pigments of soursop, 270 days after transplanting.
为了减轻盐胁迫的有害影响，已经使用了能够作为胁迫缓解剂和/或胁迫耐受诱导剂的物质，从而能够利用盐水并有助于灌溉农业的发展。在这种情况下，本研究的目的是评估叶面喷施过氧化氢作为减轻盐胁迫对酸角形态生理学影响的效果。该实验在巴西坎皮纳格兰德的温室条件下进行，采用随机区组设计，4×4 因子排列，其处理结果是灌溉水电导率（ECw）的四个水平（0.8-对照、1.6、2.4 和 3.2 dS m-1）和四个浓度的过氧化氢（H2O2）的组合-0、10、20 和 30 μM），重复三次。叶面喷施 10 μM 浓度的过氧化氢可促进酸角的生长、叶绿素合成和叶片相对含水量，从而降低 ECw 灌溉下酸角叶片的水饱和亏缺，最高可达 1.6 dS m-1。过氧化氢浓度为 30 μM 加剧了电解质泄漏和叶片光合色素对酸角的盐胁迫，移栽后 270 天。
