Capitulino Jessica Dayanne, Lima Geovani Soares de, Azevedo Carlos Alberto Vieira de, Silva André Alisson Rodrigues da, Arruda Thiago Filipe de Lima, Soares Lauriane Almeida Dos Anjos, Gheyi Hans Raj, Dantas Fernandes Pedro, Sobral de Farias Maria Sallydelândia, Silva Francisco de Assis da, Dias Mirandy Dos Santos
Academic Unit of Agricultural Engineering, Federal University of Campina Grande, Campina Grande 58430-380, PB, Brazil.
Academic Unit of Agrarian Sciences, Federal University of Campina Grande, Pombal 58840-000, PB, Brazil.
Plants (Basel). 2023 Jan 29;12(3):599. doi: 10.3390/plants12030599.
Hydrogen peroxide at low concentrations has been used as a salt stress attenuator because it induces a positive response in the antioxidant system of plants. This study aimed to assess the gas exchange, quantum yield, and development of soursop plants cv. Morada Nova grown with saline water irrigation and foliar hydrogen peroxide application. The experiment was carried out under greenhouse conditions using a randomized block design in a 4 × 4 factorial scheme corresponding to four levels of electrical conductivity of irrigation water, ECw (0.8, 1.6, 2.4, and 3.2 dS m), and four doses of hydrogen peroxide, HO (0, 10, 20, and 30 μM), with three replicates. The use of irrigation water with electrical conductivity above 0.8 dS m inhibited stomatal conductance, internal CO concentration, transpiration, maximum fluorescence, crown height, and vegetative vigor index of the Morada Nova cultivar of soursop. Compared to untreated plants, the hydrogen peroxide concentration of 30 μM resulted in greater stomatal conductance. Water salinity of 0.8 dS m with hydrogen peroxide concentrations of 16 and 13 μM resulted in the highest variable fluorescence and quantum efficiency of photosystem II, respectively, of soursop plants cv. Morada Nova at 210 days after transplantation.
低浓度过氧化氢已被用作盐胁迫缓解剂，因为它能在植物的抗氧化系统中引发积极反应。本研究旨在评估番荔枝品种cv. Morada Nova在盐水灌溉和叶面喷施过氧化氢情况下的气体交换、量子产量和生长发育情况。实验在温室条件下进行，采用随机区组设计，4×4析因方案，对应灌溉水的四个电导率水平，ECw（0.8、1.6、2.4和3.2 dS m），以及四个过氧化氢剂量，H₂O₂（0、10、20和30 μM），重复三次。使用电导率高于0.8 dS m的灌溉水会抑制番荔枝cv. Morada Nova品种的气孔导度、胞间CO₂浓度、蒸腾作用、最大荧光、树冠高度和营养活力指数。与未处理的植株相比，30 μM的过氧化氢浓度导致气孔导度更大。在移植后210天时，电导率为0.8 dS m的水与浓度为16和13 μM的过氧化氢分别使番荔枝cv. Morada Nova植株的光系统II具有最高的可变荧光和量子效率。
