Changes in leaves component of some mango cultivars in relation to exposure to low temperature degrees.
El-Moniem E. A. A., Ismail O. M., Shaban A. E. A.
Author Affiliation: Horticultural Crop Technology Department, National Research Center, Cairo, Egypt.
World Journal of Agricultural Sciences 6 : 212-217
Abstract : This study was conducted throughout 2008 and 2009 seasons on leaves of Ewais, Sediek, Fagri-Klan and Zebda mango cultivars for studying the changes in electrical conductivity, electrolytes percentage, index of injury and total phenols in relation to exposure to low temperature degrees. The electrical conductivity, electrolytes percentage and index of injury were increased by reducing temperature degree from 4 to -4°C. There was no significant effect for reducing temperature from 4 to -4°C on total phenols in leaves of all studied cultivars. On the other hand, as the period of exposure to low temperature lengthened the values of electrical conductivity, electrolytes percentage and index of injury were increased, this was true when leaves exposed to -4°C, while when they exposed to 4°C, no significant differences were detected between the three periods of exposure (1,2 or 3 h). As for total phenols, it is clear that exposed leaves for 2 h had more effective in increasing total phenols than 1 or 3 h. of exposure. On the other side, the effect of low temperature exposure was differed from cultivar to another, since Fagri-Klan and Zebda cultivars recorded higher electrical conductivity, electrolytes percentage and index of injury when exposed to -4°C comparing with Ewais and Sediek cultivars. While Sediek and Zebda cultivars showed higher values of total phenols than the other cultivars when exposed to 4 or -4°C.