Journal
GENES
Volume 11, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/genes11020176
Keywords
adventitious roots; auxin; poplar; PtoWUSa; transgenic plant
Categories
Funding
- National Key Program on Transgenic Research [2018ZX08020002]
- National Natural Science Foundation of China [31800569]
- Fundamental Research Funds of Chinese Academy of Forestry [CAFYBB2019ZY003]
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WUSCHEL-RELATED HOMEOBOX (WOX) transcription factors play critical roles in cell fate determination during plant development. As the founding member of the WOX family, WUSCHEL (WUS) is characterized for its role in maintaining stem cell in meristem. In this study, we investigated the function of Populus tomentosa WUSCHELa (PtoWUSa) in adventitious roots (ARs) in poplar. Expression profile analysis showed that PtoWUSa was not only expressed in shoot apical meristem and stem, but also expressed in ARs. Ectopic expression of PtoWUSa in Arabidopsis resulted in shortened primary root, as well as agravitropism and multiple branches. Overexpression of PtoWUSa in poplar increased the number of ARs but decreased their length. Moreover, the AR tip and lateral root tip became larger and swollen. In addition, the expression of auxin transporter genes PIN-FORMED were downregulated in ARs of transgenic plant. Taken together, these results suggest that PtoWUSa could be involved in AR development in poplar through regulating the polar auxin transport in ARs.
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