Journal
MOLECULAR PLANT
Volume 13, Issue 9, Pages 1270-1283Publisher
CELL PRESS
DOI: 10.1016/j.molp.2020.07.002
Keywords
maize; cytoplasmic male sterility; transcription factor; nucleus-mitochondria communication
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Funding
- National Key Research and Development Programs of China [2016YFD0101803, 2017YFD0300301]
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Coordination between mitochondria and the nucleus is crucial for fertility determination in plants with cytoplasmic male sterility (CMS). Using yeast one-hybrid screening, we identified a transcription factor, ZmDREB1.7, that is highly expressed in sterile microspores at the large vacuole stage and activates the expression of mitochondria-encoded CMS gene orf355. Delta pro, a weak allele of ZmDREB1.7 with the loss of a key unfolded protein response (UPR) motif in the promoter, partially restores male fertility of CMS-S maize. ZmDREB1.7 expression increases rapidly in response to antimycin A treatment, but this response is attenuated in the Delta pro allele. Furthermore, we found that expression of orf355 in mitochondria activates mitochondria! retrograde signaling, which in turn induces ZmDREB1.7 expression. Taken together, these findings demonstrate that positive-feedback transcriptional regulation between a nuclear regulator and a mitochondrial CMS gene determines male sterility in maize, providing new insights into nucleus-mitochondria communication in plants.
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