Evaluation of Roholtiella sp. Extract on Bell Pepper (Capsicum annuum L.) Yield and Quality in a Hydroponic Greenhouse System

Abstract

This study was carried out to investigate the impacts of cyanobacteria (Roholtiella sp.) high-value product extract (HVPE) and water resuspended biomass WRB treatments on bell pepper production using the hydroponic system under greenhouse conditions. Six cyanobacteria treatments (6 ml L−1, 4 ml L−1, and 2 ml L−1 – HVPE, 6 ml L−1, 4 ml L−1, and 2 ml L−1 – WRB, and TR0 as control) were evaluated using the foliar application method. The results showed that foliar application of HVPE with treatments of 2 ml L−1, 4 ml L−1, and 6 ml L−1 produced significantly higher values of physical growth parameters of bell pepper (BP) plants (shoot length, the number of leaves, plant leaf length, plant leaf width, and the diameter of the shoot), SPAD index, yield components (the fruit length, fruit width, the number of fruit per plant, and fresh weight per fruit), biochemical composition [ascorbic acid, phenolic acid, and total soluble solids (TSS)], and the total yield compared to the control group TR0. Also, significant higher values of growth parameters (shoot length, the number of leaves, plant leaf length, plant leaf width, the diameter of the shoot), SPAD index, yield components (the fruit length, fruit width, the number of fruits per plant, and fresh weight per fruit), biochemical composition [ascorbic acid, phenolic acid, and total soluble solids (TSS)], and the total yield were obtained with foliar spraying WRB at 2 ml L−1, 4 ml L−1, and 6 ml L−1 compared to the control group TR0. Consequently, the treated bell pepper with Roholtiella sp. HVPE and WRB were more efficient in enhancing production and chemical constituents compared with the control group.

Biocontrol of Sphaerotheca fuliginea, the causal agent of powdery mildew of cucumber by using aqueous extracts from five traditional Egyptian medicinal plants

“…It was shown that the highest increase in cucumber yield and its constituents resulted from the high concentration of C. longa rhizome extract (20%). Many researchers have found that spraying crops with an effective dosage of plant extracts enhanced the production of many crop plants (Mvumi et al 2013;Elzaawely et al 2017;Bello et al 2022). This is the first time, to my knowledge, that C. longa rhizome extract has been utilized to improve cucumber plants' production and its constituent parts.…”

“…Numerous scientists have hypothesized that plant pathogens lead to an increase in phenolic chemicals and related defense enzymes in plants (Bhattacharya et al 2010;Baka et al 2013;Mianabadi et al 2015;Mostafa et al 2021aMostafa et al , b 2022. According to some researchers, spraying crops with a lot of plant extracts increased agricultural production (Mvumi et al 2013;Elzaawely et al 2017;Bello et al 2022).…”