Polyphenol oxidase activity as an index for screening mango (Mangifera indica L.) germplasm against malformation.
Sharma R. R., Singh C. N., Chhonkar O. P., Goswami A. M., Singh S. K.
Author Affiliation: Division of Fruits and Horticultural Technology, Indian Agricultural Research Institute, New Delhi-110012, India.
Plant Genetic Resources Newsletter : 41-43
Abstract : Catecholase and cresolase [monophenol monooxygenase] (PPO) enzyme activity and phenolic content were measured in 24 mango cultivars in newly emerged vegetative growth during the September-October flush in 1997 and 1998. Incidence of malformation was recorded in March-April 1998 and 1999. Enzyme activity and phenolic content varied widely among cultivars, and was highest in 'Bhadauran' and lowest in 'Tommy Atkins'. Floral malformation incidence was highest (53.75%) in 'Tommy Atkins' and lowest in 'Bhadauran' (1.10%). A strong positive correlation was found between the incidence of floral malformation and both enzyme activity and phenolic content. Thus PPO activity can be used as a biochemical index for screening mango germplasm against malformation.