Effect of levels and timing of application of gibberellic acid on growth and yield components of common beans

Effect of Some Growth Regulators in The Presence of Boron on Growth, Yield and Chemical Composition of Common Bean Under Different Sowing Dates

“…Whereas, the greatest number of branches and leaves/plant as well as the heaviest fresh and dry weights of plants were scored by BA +B-sprayed plants, followed by those sprayed by GA 3 +B treatment in the two seasons. Obtained results are in agreement with those reported by Ngatia et al(2004), Abd-Alla (2006), Emongor (2007), Zewail et al(2011), Alexander et al(2012), Sakineh et al(2013). Concerning the interaction effect between sowing dates and growth substances, data in the same Table indicate that the tallest plants (64.3 and 67.6 cm) was scored by the combinations of mid March sowing date, combined with those received NAA+B, followed by those sprayed with GA 3 +B treatment as it recorded 63.1 and 64.9 cm in the first and second seasons, respectively.…”

“…In general, BA+B -sprayed plants recorded the highest values of seed yield per plant, seed yield/fed and weight of 100 seeds, followed by NAA +B -sprayed plants, with significant differences between them in the two seasons. In this respect, Eid (1991), Ngatia et al(2004), Abd-Alla (2006), Emongor (2007), Zewail et al(2011), Alexander et al(2012), Sakineh et al(2013) used different growth substances reported similar results. As for the interaction effect between sowing dates and growth substances, data in Table 5 reveal that the highest seed yield/plant (19.68 and 20.26 g), seed yield/fed (1181.0 and 1216 kg) and weight of 100 seeds (39.12 and 41.84g) were scored by the combinations of sowing on mid March, combined with those plants received BA+B treatment, in the first and second seasons respectively.…”

“…Also, GA 3 +B and NAA+Bsprayed plants gave the highest increases in these parameters in the two seasons. In this regard, Eid (1991), Ngatia et al(2004), Abd-Alla (2006), Emongor (2007), Zewail et al(2011), Alexander et al(2012), Sakineh et al(2013) mentioned that growth regulator substances improved chemical constituent of plant foliage.…”

“…Gibberellins (GAs) are a class of phytohormones that control many aspects of plant growth and development, including seed germination, leaf expansion, stem elongation, flower initiation and development, sex determination, and fruit development (Li et al 2010). In this regard, Ngatia et al(2004) reported that application of GA 3 at 2.5,5,7.5 mg/l led to an increase in plant height, leaf area, fresh and dry weight of common bean plants. It also increased number of pods and seed yield per plant as well as 100-seed mass and harvest index.…”

Plant Bio-regulators for Enhancing Grain Yield and Quality of Legumes: A Review

“…These bio-regulators act at very low concentration and any exogenous application of these influences the processes of growth and development which are being coordinated by the phytohormones in plants. For example, auxins cause cells to elongate and promote root growth in plants (Jeyakumar et al, 2008); gibberllins helps in cell elongation, cell division, stimulation of seed germination, seedling growth, development of flowers and increase in size of fruits (Ngatia et al, 2004); cytokinins stimulates cell division, morphogenesis, delay senescence and has role in stomata opening (Raskin 1992a); abscissic acid a growth inhibiting hormone and has role in seed dormancy, stomata closing and opening during drought etc., while ethylene is associated with senescence and abscission (Olaiya et al, 2013;Kumar et al, 2013;Khan and Mazid, 2018).…”