Effect of foliar application of gibberellic acid on different growth contributing characters of mungbean

Abstract

The comparative growth and yield performances between two Mungbean (BARI Mung 6 and BARI Mung 5) varieties with foliar application of GA3 (0, 50, 100 and 150 ppm) were studied to find out the suitable variety and optimum level of GA3 application. The design of experiment followed was RCBD. Data on morpho-physiological characteristics were recorded at 15, 25, 35, 45and 55 days after sowing (DAS) and yield contributing parameters were recorded only at harvest stage. The results showed that application of GA3 @ 100 ppm produced better performance on morpho-physiological characters namely, plant height (56.59cm), number of leaves per plant (10.75), branches per plant (4.75), length of root (24.73cm), total dry matter weight (12.67g)which were recorded from the variety BARI mung 6 with the foliar application of GA3 @ 100 ppm. Yield contributing characters were also showed the highest performance in terms of number of pods per plant (23.40), pod length (6.67cm), number of seeds per pod (12.82), thousand seed weight (33.95 g), seed yield (7.53 g/plant and 1.92 t ha–1), and harvest index (35.36%) which were the highest with the application of 100 ppm GA3 in case of BARI Mung 6. Single and combined effects of treatments were found statistically significant. Between two varieties BARI Mung 6, among the treatments GA3 @ 100 ppm as foliar application and interaction effect of GA3 @ 100 ppm and BARI mung 6 showed the highest performance in respect of all growth and yield parameters.
 Progressive Agriculture 29 (3): 233-238, 2018

Responses of Water and Pigments Status, Dry Matter Partitioning, Seed Production, and Traits of Yield and Quality to Foliar Application of GA3 in Mungbean (Vigna radiata L.)

“…It may be due to greater cell division and stem elongation (longer plant), higher RWC, photosynthetic pigments, and plant biomass (fresh weights of leaves, stems, and roots) and N content in grains. Similar trends of better plant growth due to cell division and expansion (Roy and Nasiruddin, 2011), higher photosynthesis (Kumar et al, 2014), more total chlorophyll, carotenoid, total carbohydrates (Singh et al, 2015), higher crop growth rate (CGR), relative growth rate (RGR) (Rahman et al, 2018) was recorded in many studies. On the other hand, our study contradicts the earlier findings as nonsignificant improvement of shoot dry weight in V. radiata was observed by exogenous application of GA 3 (Kundu et al, 2017).…”

“…It is well-established that greater dry matter production and distribution significantly contributes to the yield potential of crop plants and would appear to largely account for the increased crop yields. A clear correlation between phytohormone content and the rate of dry matter accretion by the sink is recorded in many recent studies (Rahman et al, 2018;Miceli et al, 2019;Renu, 2019). PGRs have a potential role to influence the movement of photo-assimilates through their action on either sink activity and/or sink size.…”

“…The enhancement of leaf area as well as leaf fresh weight has been demonstrated by Rahman et al (2018) in V. radiata, and they concluded that 100 ppm GA 3 as foliar application had produced highly significant values for obtaining the more leaf area comparatively than that of other foliar treatments. A similar conclusion was drawn from a very recent study by Renu (2019) who stated that GA 3 at 200 ppm increased the fresh weight of leaves plant −1 in V. radiata.…”

“…Significant variation due to varieties was also obtained in respect of plant growth including stem fresh weight plant −1 . Rahman et al (2018) noticed that foliar application of 100 ppm GA 3 produced the highest plant growth (total biomass) in two V. radiata varieties of BARI Mung-6 and BARI Mung-5, and the previous variety produced higher biomass than the later. In previous studies (Hedden and Phillips, 2000;Sevik and Guney, 2013), GA 3 showed greater influence on many growth and developmental processes in plants which was confirmatory to the present report, that was particularly important in regulating the stem elongation (Zhang et al, 2007).…”

“…GA 3 is a phyto-hormone, and terpenoid compounds containing 19-20 carbon atoms, naturally produced in new leaves and germinated seed embryos, and more than 136 species have been identified (Sponsel and Hedden, 2004). Very small amount of GA 3 enhances stem elongation (Abd El-Fattah, 1997;Hoque and Haque, 2002;Abdel and Al-Rawi, 2011;Keykha et al, 2014) by increasing cell divisions and cell size Zeiger, 2006, 2010), improves plant growth and development (Kundu et al, 2017;Rahman et al, 2018) by inducing metabolic activities (Kumar et al, 2014;Singh et al, 2015), many key enzymes like carbonic anhydrase (CA), nitrate reductase (NR) (Afroz et al, 2005;Aftab et al, 2010;Ahmad Dar et al, 2015), ribulose-1, 5-biphosphate carboxylase/oxygenase (RuBPCO) (Yuan and Xu, 2001), and regulating nitrogen utilization (Siddiqui et al, 2008;Khan et al, 2010;Sure et al, 2012;Zhang et al, 2017;Miceli et al, 2019), consequently increases dry weight and yield (Asahina et al, 2002;Tasnim et al, 2020). It also induces growth and development by enhancing water uptake in plant tissues (Al-Whaibi et al, 2010;Maggio et al, 2010;Renu, 2019), photosynthetic pigments (El Karamany et al, 2019), photosynthesis (Khan et al, 2002;Aftab et al, 2010), sex determination (Fleet and Sun, 2005), flower formation and fruit set in legumes (Deotale et al, 1998;Chauhan et al, 2010), and hence amplifies yield of many crops (Bhadra, 2004;Bora and Sharma, 2006;Abdel-Mouty and El-Greadly, 2008;…”