ABSTRACT
The high content of abscisic acid (ABA) within the parasite may be a causal connection with the parasitic absorption of nutrients from host sieve tubes. ABA even at 100 pM was only 60 percent inhibitory and is toxic at higher concentrations. The high content of ABA within the parasite may be a causal connection with the parasitic absorption of nutrients from host sieve tubes. The high content of ABA is found in the basal region of the parasite where nutrient transfer from the host to the parasite occurs. It appears that ABA is probably directly involved in the transfer of nutrients from the host to the parasite. The shoots of infected plants of one variety evolved more ethylene during the early infection period than the non-infected shoots. Cytokinin activity appears to be uniformly distributed through out the parasite but different kinds of cytokinins are detected in different segments.
