Faculty of Agriculture, University of Cairo, Egypt.
Chlorosis resulted in remarkable reduction in the growth and development of the different rootstock plants as indicated by their stunted growth and reduced leaf production. Highest percentage of chlorotic root stock plants was found in case of P. calleryana, followed by P. communis and lastly by Quince. Le Conte plants propagated by cuttings did not show any sign of chlorosis.
High pH no doubt reduces the availability of soil iron and accordingly the uptake and absorption of iron by the rootstocks is greatly affected. Such reduced rate of uptake and absorption resulted in a slow rate of entry of iron in the developing leaves, which favours inactivation and accumulation of iron in leaves.
