%0 Journal Article
%T Difference in Nitrogen Starvation-Inducible Expression Patterns among Phylogenetically Diverse Ammonium Transporter Genes in the Red Seaweed <i>Pyropia yezoensis</i>
%A Chengze Li
%A Inori Ariga
%A Koji Mikami
%J American Journal of Plant Sciences
%P 1325-1349
%@ 2158-2750
%D 2019
%I Scientific Research Publishing
%R 10.4236/ajps.2019.108096
%X Nitrogen deficiency induces senescence and the
expression of genes encoding ammonium transporters (AMTs) in terrestrial plants
where the AMT family is subdivided into AMT1 and AMT2 subfamilies. Nitrogen
starvation in the red seaweed <i><span style=\"font-family:Verdana;\">Pyropia</span></i><i><span style=\"font-family:;\" \"=\"\"> </span></i><i><span style=\"font-family:Verdana;\">yezoensis</span></i><span style=\"font-family:;\" \"=\"\"><span style=\"font-family:Verdana;\"> causes senescence-like discoloration.</span><i> </i><span style=\"font-family:Verdana;\">In this </span><span style=\"font-family:Verdana;\">study, we identified</span></span><span style=\"font-family:;\" \"=\"\"> </span><span style=\"font-family:Verdana;\">five</span><span style=\"font-family:;\" \"=\"\"> </span><span style=\"font-family:;\" \"=\"\"><span style=\"font-family:Verdana;\">genes in </span><i><span style=\"font-family:Verdana;\">P</span></i><span style=\"font-family:Verdana;\">.</span><i><span style=\"font-family:Verdana;\"> yezoensis</span></i></span><i><span style=\"font-family:;\" \"=\"\"> </span></i><span style=\"font-family:Verdana;\">encoding AMT do</span><span style=\"font-family:Verdana;\">main-containing
proteins,</span><span style=\"font-family:;\" \"=\"\"> </span><span style=\"font-family:Verdana;\">which
were phylogenetically categorized into the AMT1 subfamily. We also found a gene
encoding a Rhesus protein (Rh) that was related to,</span><span style=\"font-family:;\" \"=\"\"> </span><span style=\"font-family:Verdana;\">but diverged from, AMTs.</span><span style=\"font-family:;\" \"=\"\"> </span><span style=\"font-family:Verdana;\">Moreover, our phylogenetic
analysis showed that AMT domain-containing proteins from micro- and macro-algae
belonged to either the AMT1 or Rh subfamily, indicating the absence of AMT2 in
algae. Gene expression analyses
revealed the presence of gametophyte- and sporophyte-specific</span><span style=\"font-family:;\" \"=\"\"> </span><span style=\"font-family:Verdana;\">AMT1 genes</span><span style=\"font-family:;\" \"=\"\"> </span><span style=\"font-family:;\" \"=\"\"><span style=\"font-family:Verdana;\">that were
up-regulated transiently and continual</span><span style=\"font-family:Verdana;\">ly,
respectively, under nitrogen-deficient conditions. In addition,</span><span style=\"font-family:Verdana;\"> up-regulated
sporophyte-specific gene expression was suppressed when nitrogen was resupplied.
Accordingly, an expansion of the ancient AMT gene has produced</span><i> </i><span style=\"font-family:Verdana;\">AMT1 functional variants
%K Ammonium Transporter
%K Discoloration
%K Nitrogen
%K &lt
%K i&gt
%K Pyropia yezoensis&lt
%K /i&gt
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=94569