Abstract
Several species of Anthoceros were analysed for abscisic acid (ABA). They all contain ABA-like immunoreactive material based on a combined HPLC-monoclonal-antibody-ELISA- analysis. The stomata-bearing sporophytes and the tubers of A. dichotomus contain significantly more ABA-immunoreactivity than the stoma free thallus. The concentration of this material in the sporophytes increases with tissue age, resulting in a high level in the apical parts. When 14C-ABA is applied to apical or basal parts of the sporophyte, radioactivity moves preferentially basipetally and enters the gametophyte. After application to the gametophyte, radioactivity distributes all over the gametophyte but does not enter the sporophyte. ABA-content of Anthoceros species which were harvested from a moist habitat is lower than in samples grown under slightly dryer conditions. Sporophytes of A. laevis exhibit a stress-induced ABA biosynthesis. Stomata from Anthoceros sporophytes respond to ABA-(closing) and fusicoccin (FC)-treatment (opening). Several stomata- free species of Marchantiales were analysed too for ABA. They all contain ABA-like immunoreac- tivity. Particularly the desiccation tolerant species Exormotheca and Plagiochasma have very high amounts of this material.
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