Sinha, Neelima , Garces, Helena , Champagne, Connie , Uchida, Naoyuki , Koenig, Dan , David-Schwartz, Rakefet , Townsley, Brad .
Shoots and leaves, an evo-devo perspective.
Leaves are determinate structures. Here we report on a special case of shoot formation on leaves in the genus Kalanchoe. Expression studies and transgenic analyses suggest that these leaf-borne shoots are somatic embryos. The Class I Knotted-like homeobox (KNOX 1) genes are highly expressed in the shoot apical meristem but not expressed in the emerging leaf primordium in tobacco, maize, or Arabidopsis. We have analyzed compound leaf producing shoot apices in clades with independently derived compound leaves and shown that with one exception (a derived clade in the Fabaceae) compound leaves always show expression of KNOX genes (Bharathan et al., 2002). In the derived pea clade the LFY/FLO gene regulates this function of generating leaf complexity. We have explored the function of LFY in the basal and derived clades in the Fabaceae. In addition, we find that other genes like PHANTASTICA might play a role in determining the form of the compound leaf generated.
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1 - University of California, Davis, Plant Biology, 1 Shields Avenue, Davis, CA, 95616, USA
2 - U. C. Davis, Plant Biology
Presentation Type: ASPB Major Symposium
Location: International Ballroom/Hilton
Date: Monday, July 9th, 2007
Time: 4:20 PM