Eva Sundberg – Uppsala BioCenter, Dept of Plant Biology and Forest Genetics, The Swedish University of Agricultural Sciences (SLU)
+46 (0) 18-673245
see also: PudMed, ResearcherID
Expertise: Auxin homeostasis and plant development
Several key genetic regulators of gynoecium development relate to the synthesis, transport or signal transduction of the plant hormone auxin. We are therefore studying auxin dynamics during the earliest stages of gynoecium primordial development, when tissue domains are specified and suggest that gynoecial valve outgrowth depends on PIN1-mediated lateral auxin maxima as well as subsequent internal auxin drainage and provascular formation. In addition, polar auxin transport is required to prevent the lateral domains from obtaining medial fates.
Most available data suggest that the evolution of the diploid multi-cellular sporophyte dominating the higher plant life cycle involved the recruitment of existing gametophytic developmental programs of the haploid early bryophytes (Floyd and Bowman 2007). We have studied the role of the plant hormone auxin in the haploid gamtetophyte of moss, by modulating the expression levels of moss homologues of the STY/SHI auxin biosynthesis regulators, of auxin biosynthesis genes, as well as of genes encoding homologues of PIN transporters. These proteins play conserved roles in auxin peak formation controlling cell differentiation and growth of protonemal tissue, as well as of leaves and reproductive organs of moss gametophores.