UNASSIGNED: @entity2271 ( @entity2272 ) is a phytohormone widely distributed among members of the land plant lineage (Embryophyta), regulating dormancy, stomata closure and tolerance to environmental stresses. In angiosperms (Magnoliophyta), @entity2272 -induced gene expression is mediated by promoter elements such as the G-box-like ACGT-core motifs recognized by bZIP transcription factors. In contrast, the mode of regulation by @entity2272 of gene expression in @entity42721 (Marchantiophyta), representing one of the earliest diverging land plant groups, has not been elucidated. In this study, we used promoters of the @entity42721 @entity42721 dehydrin and the @entity3505 Em genes fused to the b-glucuronidase (GUS) reporter gene to investigate @entity2272 -induced gene expression in @entity42721 . Transient assays of cultured cells of @entity42721 indicated that ACGT-core motifs proximal to the transcription initiation site play a role in the @entity2272 -induced gene expression. The RY sequence recognized by B3 transcriptional regulators was also shown to be responsible for the @entity2272 -induced gene expression. In transgenic @entity42721 plants, @entity2272 treatment elicited an increase in GUS expression in young gemmalings, which was abolished by simultaneous disruption of the ACGT-core and RY elements. @entity2272 -induced GUS expression was less obvious in mature thalli than in young gemmalings, associated with reductions in sensitivity to exogenous @entity2272 during gametophyte growth. In contrast, @entity68824 , which had been suggested to function as an @entity2272 -like substance, had no effect on GUS expression. The results demonstrate the presence of @entity2272 -specific response mechanisms mediated by conserved cis-regulatory elements in @entity42721 , implying that the mechanisms had been acquired in the common ancestors of embryophytes.

XXXX -induced gene expression in the @entity42721 @entity42721 is mediated by evolutionarily conserved promoter elements.

@entity2272 :: ('CHEBI:2365', 'Chemical') :: ['ABA'] @entity2271 :: ('MESH:D000040', 'Chemical') :: ['Abscisic acid'] @entity42721 :: ('3197', 'Species') :: ['Marchantia', 'liverworts', 'liverwort', 'Marchantia polymorpha'] @entity3505 :: ('4565', 'Species') :: ['wheat'] @entity68824 :: ('MESH:C067452', 'Chemical') :: ['lunularic acid']
@entity2271 :: (MESH:D000040,Chemical) :: ['Abscisic acid']
