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Xu K.,State Key Laboratory of Crop Stress Biology for Arid Areas | Xu K.,Key Laboratory of Wheat Biology and Genetic Improvement on Northwestern China | Xu K.,Northwest Agriculture and Forestry University | Wang Y.,State Key Laboratory of Crop Stress Biology for Arid Areas | And 12 more authors.
Journal of Plant Growth Regulation

Switchgrass belongs to the family Poaceae and genus Panicum, and is a highly versatile grass used for soil and water conservation, livestock production, and biomass production for energy conversion. Tillering plays an important role in determining the morphology of the aboveground parts and the final biomass yield of switchgrass. In this study, we first cloned and identified PvTB1, a teosinte branched1 (TB1) gene homolog in switchgrass, based on its sequence similarity with the TB1 gene, which is involved in lateral branching in maize. Similar to other TB1 genes, the PvTB1 gene encoded putative transcription factors containing a basic helix-loop-helix type of DNA-binding motif called the TCP domain. Tiller emergence and development were obviously inhibited by overexpression of PvTB1 in transgenic plants, and the mutated phenotypes could be rescued using 6-benzylaminopurine. Overexpression or suppression of PvTB1 through a transgenic approach resulted in changes in tiller number, stem height, stem diameter, and biomass yield. Taken together, our results suggest that PvTB1 negatively regulates tillering in switchgrass, presumably via its expression in axillary buds. © 2015 Springer Science+Business Media New York Source

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