ENDOGENOUS GIBBERELLINS IN CLOVER BROOMRAPE, A PARASITIC PLANT, AND ITS HOST, CLOVER - DEPENDENCY OF THE PARASITE ON THE HOST FOR GIBBERELLIN PRODUCTION

Endogenous gibberellins were analyzed from a parasitic plant, clover b roomrape (Orobanche minor Smith), and its host, clover (Trifolium repe ns L.). Members of both the early-13- and the early-non-hydroxylation pathways were identified from both the parasite and the host (GA12, GA 24, GA9, GA4, GA44, GA19, GA20, and GA1 from clover broomrape; GA9, GA 4, GA44, GA19, GA20, and GA1 from clover). Quantitative analyses showe d that GA44 was present at high levels in both host and parasite. The similarity in the gibberellins suggests the possibility that the major gibberellins in clover broomrape are transported from clover. However , gibberellins such as GA58, GA38, and notably GA47, which was identif ied from a plant for the first time, were detected only from clover br oomrape, suggesting that the parasite may have the ability to produce at least those gibberellins.