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Abscission Zones in Grasses and Their Modification During Domestication

Hao Hu, Nikee Shrestha

 

All plants need to disperse their propagules. In grasses, dispersal is accompanied by the formation of an abscission zone, but we have found that this varies significantly in morphology across the grasses.  In collaboration with the Kellogg Lab at the Danforth Plant Sciences Center we found that the transcriptome profiles for abscission zones also varies significantly between distantly related species (Setaria, rice, Brachypodium). We are presently characterizing a novel form of abscission zone in pearl millet and its wild relatives (Cenchrus americanus), and using the close relationship between Cenchrus and Setaria to ask whether there is more conservation in genetic regulation between them than across the grasses as a whole.

 

 

p mon inflor in color
p mon inflor in color
p mon inflor in colorDr. Doust
penn mon 5120 fascicles
penn mon 5120 fascicles
penn mon 5120 fasciclesDr. Doust
cenchrus monodii ad1 3 012
cenchrus monodii ad1 3 012
cenchrus monodii ad1 3 012Dr. Doust
Figure 2
Figure 2
Figure 2Dr. Doust
Figure 3
Figure 3
Figure 3Dr. Doust
Figure 4
Figure 4
Figure 4Dr. Doust

Publications

  • Yu, Y., Hu, H. Doust, A.N., and E.A. Kellogg. 2019. Divergent gene expression networks underlie morphological diversity of abscission zones in grasses. New Phytologist. 225:1799-1815. doi: 10.1111/nph.16087.
  • Hu, H., M. Mauro-Herrera, and A.N. Doust. 2018. Domestication and improvement in the model C4 grass, Setaria.  Frontiers in Plant Science. 9:719 doi: 10.3389/fpls.2018.00719.
  • Doust, A.N., Lukens, L., Olsen, K.M., Mauro-Herrera, M., Meyer, A., Rogers, K. 2014. Beyond the single gene – do epistasis and gene-by-environment effects influence crop domestication? Proceedings of the National Academy of Sciences 111: 6178-6183.
  • Doust, A.N., M. Mauro-Herrera, A.D. Francis, and L.C. Shand. 2014. Morphological diversity and genetic regulation of inflorescence abscission zones in grasses. American Journal of Botany 101: 1759-1769.
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