title: Arabidopsis light-dependent NADPH: protochlorophyllide oxidoreductase A (PORA) is essential for normal plant growth and development: an addendum.
abstract: Recently the porA-1 null mutant of Arabidopsis thaliana has been identified, which contains an insertion of the Dissociation (Ds) element in the PORA gene (Paddock et al. in Plant Mol Biol 78:447-460, 2012). Light-grown porA-1 seedlings suffer from a drastically reduced chlorophyll content and a developmental arrest beyond the cotyledon stage, suggesting that PORA is not only transiently involved in initiating chlorophyll synthesis during illumination of etiolated seedlings but is also essential for normal growth and plant development. Here we report the presence of a second Ds element in this porA-1 mutant line that inactivates the Speechless gene required for stomata formation. Similar to porA-1, speechless seedlings are severely impaired in their development. Our results suggest that the lack of stomata in porA-1 may contribute to the dwarfed phenotype of the mutant and thus emphasizes the need to re-address the proposed role of PORA during plant development by studying a porA mutant that retains its stomata formation.
authors.affiliation: Boyce Thompson Institute for Plant Research, Ithaca, NY 14853-1801, USA.
authors.forename: Chanhong
authors.initials: C
authors.lastname: Kim
authors.forename: Klaus
authors.initials: K
authors.lastname: Apel
mesh_terms: D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics; D002734:Chlorophyll / Q000378:metabolism; D004251:DNA Transposable Elements / Q000235:genetics; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D008027:Light; D018613:Microscopy, Confocal; D008855:Microscopy, Electron, Scanning; D016254:Mutagenesis, Insertional; D009154:Mutation; D009249:NADP / Q000378:metabolism; D044925:Oxidoreductases Acting on CH-CH Group Donors / Q000235:genetics* / Q000378:metabolism; D019441:Plant Epidermis / Q000235:genetics / Q000378:metabolism / Q000648:ultrastructure; D054046:Plant Stomata / Q000235:genetics / Q000378:metabolism / Q000648:ultrastructure; D030821:Plants, Genetically Modified; D036226:Seedlings / Q000235:genetics / Q000378:metabolism / Q000528:radiation effects
chemical_list: D029681:Arabidopsis Proteins; D051792:Basic Helix-Loop-Helix Proteins; D002734:Chlorophyll; D004251:DNA Transposable Elements; D049452:Green Fluorescent Proteins; D009249:NADP; D044925:Oxidoreductases Acting on CH-CH Group Donors; C517480:SPEECHLESS protein, Arabidopsis; C023886:protochlorophyllide reductase