EN
Var i ous spe cies and cultivars of Ericaceae fam ily were checked for the pres ence of long-chain polyprenols in their leaves. In the ge nus Rhododendron no polyprenols were found in the ever-green spe cies, while they were pres ent in the de cid u ous type. The polyprenols were of chain-length of 14-20 isoprene res i dues and they oc curred in the form of acetic acid esters. The polyprenol accu mu la tion is dis cussed with respect to se nes cence of leaves.