The bHLH transcription factor SPATULA regulates root growth by controlling the size of the root meristem

摘要: The Arabidopsis thaliana gene SPATULA (SPT), encoding a bHLH transcription factor, was originally identified for its role in pistil development. SPT is necessary the growth and development of all carpel margin tissues including style, stigma, septum transmitting tract. Since then, it has been shown to have pleiotropic roles during development, restricting meristematic region leaf primordia cotyledon expansion. Although expressed roots, this organ not investigated. An analysis embryo root showed that loss function causes an increase quiescent center size both embryonic postembryonic stem cell niches. In addition, meristem larger due increased division, which leads longer primary root. spt mutants exhibit other developmental phenotypes, more flowers, shorter internodes extended flowering period. Genetic molecular suggests regulates proliferation parallel gibberellic acid as well affecting auxin accumulation or transport. Our data suggest functions control throughout sporophytic Arabidopsis, but fate decisions except independently may play regulating transport accumulation. plays growth, similar above ground tissues.