Altering the enzyme activities for enhancing yield in 'off' year mango (cv. Alphonso) through chemicals and growth regulators.
Vijayalakshmi D., Srinivasan P. S.
Author Affiliation: Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore - 641 003, India.
Orissa Journal of Horticulture 29 : 89-92
Abstract : An experiment was conducted in Tamil Nadu, India during September 1995 with certain chemical and growth regulators in off-year Alphonso mango to understand the role of these enzyme activities in manipulating certain processes, thereby bringing about yield during off-years. Between the stages of sampling, the activities of catalases and peroxidases registered peak values at the fourth stage with a gradual decline in the activity at the time of harvest. The mean catalase activity was favoured to a greater extent by soil application of paclobutrazol (12.57 µmol). Moreover, a highly significant positive association was established between catalase and peroxidase activity and yield of fruits. Nitrate reductase activity varied significantly between the treatments and stages of sampling. A significant increase was due to the foliar application of 1% urea. The increase in the enzyme activity led to the growth and development of the crop, thereby remaining as a crucial factor for crop yield during the off-years. A high decline in IAA oxidase activity was observed in the treatment of soil application of paclobutrazol (366.67 µg IAA oxidase). A highly significant negative association was established between the IAA oxidase activity and yield of fruits.