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miR156-PvSPL2 controls culm development by transcriptional repression of switchgrass CYTOKININ OXIDASE/DEHYDROGENASE4.
Yang, Ruijuan; Wu, Zhenying; Sun, Ying; Liu, Yuchen; Hang, Yuqing; Liu, Min; Liu, Yajun; Wang, Xiaoshan; Liu, Wenwen; Fu, Chunxiang.
Afiliación
  • Yang R; CAS Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
  • Wu Z; Shandong Energy Institute, Qingdao, 266101, China.
  • Sun Y; Qingdao New Energy Shandong Laboratory, Qingdao, 266101, China.
  • Liu Y; CAS Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
  • Hang Y; Shandong Energy Institute, Qingdao, 266101, China.
  • Liu M; Qingdao New Energy Shandong Laboratory, Qingdao, 266101, China.
  • Liu Y; College of Life Science, University of Chinese Academy of Sciences, Beijing, 100049, China.
  • Wang X; CAS Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
  • Liu W; Yangzhou University, Yangzhou, 225009, China.
  • Fu C; CAS Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
Plant J ; 118(6): 2055-2067, 2024 Jun.
Article en En | MEDLINE | ID: mdl-38507513
ABSTRACT
Culm development in grasses can be controlled by both miR156 and cytokinin. However, the crosstalk between the miR156-SPL module and the cytokinin metabolic pathway remains largely unknown. Here, we found CYTOKININ OXIDASE/DEHYDROGENASE4 (PvCKX4) plays a negative regulatory role in culm development of the bioenergy grass Panicum virgatum (switchgrass). Overexpression of PvCKX4 in switchgrass reduced the internode diameter and length without affecting tiller number. Interestingly, we also found that PvCKX4 was always upregulated in miR156 overexpressing (miR156OE) transgenic switchgrass lines. Additionally, upregulation of either miR156 or PvCKX4 in switchgrass reduced the content of isopentenyl adenine (iP) without affecting trans-zeatin (tZ) accumulation. It is consistent with the evidence that the recombinant PvCKX4 protein exhibited much higher catalytic activity against iP than tZ in vitro. Furthermore, our results showed that miR156-targeted SPL2 bound directly to the promoter of PvCKX4 to repress its expression. Thus, alleviating the SPL2-mediated transcriptional repression of PvCKX4 through miR156 overexpression resulted in a significant increase in cytokinin degradation and impaired culm development in switchgrass. On the contrary, suppressing PvCKX4 in miR156OE transgenic plants restored iP content, internode diameter, and length to wild-type levels. Most strikingly, the double transgenic lines retained the same increased tiller numbers as the miR156OE transgenic line, which yielded more biomass than the wild type. These findings indicate that the miR156-SPL module can control culm development through transcriptional repression of PvCKX4 in switchgrass, which provides a promising target for precise design of shoot architecture to yield more biomass from grasses.
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Texto completo: 1 Banco de datos: MEDLINE Asunto principal: Oxidorreductasas / Proteínas de Plantas / Regulación de la Expresión Génica de las Plantas / MicroARNs / Panicum Idioma: En Revista: Plant J Asunto de la revista: BIOLOGIA MOLECULAR / BOTANICA Año: 2024 Tipo del documento: Article País de afiliación: China

Texto completo: 1 Banco de datos: MEDLINE Asunto principal: Oxidorreductasas / Proteínas de Plantas / Regulación de la Expresión Génica de las Plantas / MicroARNs / Panicum Idioma: En Revista: Plant J Asunto de la revista: BIOLOGIA MOLECULAR / BOTANICA Año: 2024 Tipo del documento: Article País de afiliación: China