Influence of pre-harvest application of gibberellin and brassinosteroid on fruit growth and quality characteristics of pear (Pyrus pyrifolia (Burm.) Nakai) cv. Gola

Abstract

Quality of fruit crop is an important parameter to decide the acceptability of the product. The present study consists of seventeen year old pear (Pyrus pyrifolia (Burm.) Nakai) trees subjected to seven treatments viz., GA3 (50 ppm,100 ppm), BR (0.5 ppm, 1.0 ppm), and GA3 + BR (50 ppm + 0.5 ppm and 100 ppm + 1 ppm) and water as control, sprayed thrice at 15 days intervals starting from petal fall stage. Each treatment was replicated thrice with one tree served as a treatment unit. The experiment was conducted in Randomized Block Design. The fruits treated with GA3 @ 50 ppm (T1) showed the highest fruit length (6.98 cm), breadth (6.81 cm), weight (175.9 g) and volume (171.16 cc). An improvement in terms of fruit quality was observed either alone or in combined application of GA3 and BR. The application of BR @ 1 ppm (T4) recorded the highest TSS (12.91°Brix) and lowest titrable acidity (0.42%) while the highest ascorbic acid content (6.95 mg / 100 g) and non reducing sugar (0.44%) was estimated under GA3 @ 100 ppm + BR @ 1 ppm (T6). Total sugar (7.88%) and reducing sugar (7.45%) was observed highest in GA3 @ 50 ppm + BR @ 0.5 ppm (T5). Based on this research combined application of GA3 + BR had a positive effect and therefore can be recommended for spray on pear in order to obtain higher yield and better quality.

Impact of Some Preharvest Treatments on Fruit Size and Quality of "African Rose" Plums

“…Its physiological efficacy is activating the translocation and assimilation of metabolic materials, enhancing photosynthesis activity, and hormonal regulation of plant morphogenesis according to Guo et al (2011) andNisler (2018). These findings of brassinolide treatments agreed with those obtained by (Tadaion et al, 2014) on 'Khalili' grapevine; Roghabadi and Pakkish (2014) on 'Tak Danehe Mashhad' sweet cherry, they all found that brassinolide treatments significantly increased total soluble solids, total sugars, anthocyanin and vitamin C. Thapliyal et al (2016) on pear and Ghosh et al (2022). The application of BR can lead to an increase in sugars in fruits, as BR indirectly increases the content of abscisic acid (ABA), which in turn induces the sugar metabolic pathway.…”

“…'Huangjinmiyou' and 'Hongroumiyou'. ;Thapliyal et al (2016); Aly et al (2021), noticed that the foliar application treatments of brassinolide at 1.5mg/L and 2mg/L treatments significantly increased fruit length, fruit diameter and fruit size. Roghabadi and Pakkish (2014) and EL-Boray et al (2015) found that foliar applications of brassinolide increased fruit firmness at harvest.…”

“…A foliar spray of BR can be helpful in increasing the sugar levels due to the better assimilating power of leaves over a longer period. The synergistic activity of BR can also increase the metabolic activities in various crops, which can lead to an increase in the rate of photosynthesis and chlorophyll content, ultimately affecting the overall quality of the fruits, BR can have a positive impact on the overall quality of fruits (Thapliyal et al, 2016). Abd El-Baree et al )2013(, worked on 'Costata' persimmon trees; Aly et al (2018) worked on 'Anna' apple trees.…”

Influence of New Generation PGRs on Yield Parameter and Economics of Mango (Mangifera indica L.) cv. Dashehari

“…Brassinosteroids are well known to promote photosynthesis efficiency by enhancing regeneration of RuBP and followed by an increase of CO2 fixation in photosynthesis. It also regulates stomatal activity and increases level of CO2 inside the leaves [7]. Application of triacontanol attributed to more efficient utilization of food for reproductive growth, flowering and fruit set, higher photosynthetic efficiency and enhanced source to sink relationship of the plant, increased uptake of nutrients and water, reduced transpiration and respiration, enhanced translocation and accumulation of sugar and other metabolites [5].…”

Scientific Study of Brassinosteroids on Production of Fruit Crops: A Review

“…The time of application plays a crucial role in deciding the desirable output and the combined application of gibberellin and brassinosteroid either at GA3 (100 ppm)+BR (1 ppm) or GA3 (50 ppm)+BR (0.5 ppm) as pre-harvest spray at 15 days interval starting from the petal fall stage may be recommended for improving the fruit quality of Gola pear in Tarai region [94]. As specified by [45] observed that exogenous BR treatment suppressed ethylene production and delayed fruit ripening, whereas treatment with a BR biosynthesis inhibitor promoted ethylene production and accelerated fruit ripening in hence BR has been suggested as a ripening suppressor.…”