Enzyme activities as influenced by chemicals and growth regulators in mango cv. alphonso.
Vijayalakshmi D., Srinivasan P. S.
Author Affiliation: Department of Crop Physiology, Tamil Nadu Agricultural University, Agricultural College & Research Institute, Coimbatore - 641 003, Tamil Nadu, India.
Madras Agricultural Journal 86 : 578-580
Abstract : An experiment was conducted in Tamil Nadu, India during September 1995 on 10-year-old mango trees to investigate the effect of soil drenching with paclobutrazol (10 ml a.i./ha) and foliar sprays of certain chemicals and growth regulators on the catalase, peroxidase, nitrate reductase and IAA oxidase activities in relation to yield. The foliar sprays of 1% KNO3, 1% urea, 22 ppm ethrel [ethephon], 20 ppm NAA and 5000 ppm mepiquat chloride were given at monthly intervals from September to January 1996. The increase in the peroxidase and catalase activity led to the increased chlorophyll metabolism thereby enhancing the yield in off-seasons. The increase in nitrate reductase increased growth and development. The decrease in the IAA oxidase led to high auxin content during flowering resulting in high flowering and fruit set during off-years.