Arabidopsis TCP4 transcription factor inhibits high temperature-induced homeotic conversion of ovules

Jingqiu Lan, Ning Wang, Yutao Wang, Yidan Jiang, Hao Yu, Xiaofeng Cao and Genji Qin ()
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Jingqiu Lan: Peking University
Ning Wang: Peking University
Yutao Wang: Peking University
Yidan Jiang: Peking University
Hao Yu: Peking University
Xiaofeng Cao: CAS Center for Excellence in Molecular Plant Sciences, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences
Genji Qin: Peking University

Nature Communications, 2023, vol. 14, issue 1, 1-19

Abstract: Abstract Abnormal high temperature (HT) caused by global warming threatens plant survival and food security, but the effects of HT on plant organ identity are elusive. Here, we show that Class II TEOSINTE BRANCHED 1/CYCLOIDEA/ PCF (TCP) transcription factors redundantly protect ovule identity under HT. The duodecuple tcp2/3/4/5/10/13/17/24/1/12/18/16 (tcpDUO) mutant displays HT-induced ovule conversion into carpelloid structures. Expression of TCP4 in tcpDUO complements the ovule identity conversion. TCP4 interacts with AGAMOUS (AG), SEPALLATA3 (SEP3), and the homeodomain transcription factor BELL1 (BEL1) to strengthen the association of BEL1 with AG-SEP3. The tcpDUO mutant synergistically interacts with bel1 and the ovule identity gene seedstick (STK) mutant stk in tcpDUO bel1 and tcpDUO stk. Our findings reveal the critical roles of Class II TCPs in maintaining ovule identity under HT and shed light on the molecular mechanisms by which ovule identity is determined by the integration of internal factors and environmental temperature.

Date: 2023
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DOI: 10.1038/s41467-023-41416-1

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