Effect of foliar applications of IAA and GA 3 on growth, yield and quality of pea ( Pisum sativum L.)

摘要

Experiments were conducted at University of Gujrat, Pakistan during growing seasons of 2016-17 and 2017-18 to evaluate the effect of foliar applications of GA 3 and IAA on pea. Four cultivars of pea i.e. Aleena, Classic, Green grass and Meteor were given seven foliar treatments i.e. 0 (control), 50, 100 ppm both for IAA and GA 3 and two combined treatments of IAA+GA 3 (50 and 100 ppm). Experiment was laid down in completely randomized design with four replicates. Data was collected at seedling and vegetative stages, while yield attributes were calculated at maturity. It was noted that shoot and root lengths, shoot fresh and dry weights, leaf area, net assimilation and relative growth were significantly increased by the foliar applications of IAA, GA 3 . Photosynthetic and transpiration rates, total protein and carbohydrates, fibre contents, Ca 2+ and K + were significantly changed by IAA and GA 3 separately and in combine treatments. Combine treatments of IAA and GA 3 had better effects rather than separate treatments. IAA had better effects as compared to GA 3 . POD activities were reduced and CAT activities were enhanced by foliar applications of IAA and GA 3 . It was concluded that high rate of photosynthesis resulted high biomass production and yield. High Transpiration rates helped to uptake nutrients from soil efficiently that resulted high accumulation of Ca 2+ and K + . Reduction in POD activities helped to increase the defence mechanism of plants and high CAT activities caused better balance in plant metabolism as a result growth, yield and quality of pea were increased. These outcomes can be used as a good indicator for researchers to evaluate the pea cultivars response towards plant growth regulators (PGR) to predict for promising yield and quality traits.