BES1 is activated by EMS1-TPD1-SERK1/2-mediated signaling to control tapetum development in Arabidopsis thaliana

Weiyue Chen, Minghui Lv, Yanze Wang, Ping-An Wang, Yanwei Cui, Meizhen Li, Ruoshi Wang, Xiaoping Gou and Jia Li ()
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Weiyue Chen: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences
Minghui Lv: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences
Yanze Wang: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences
Ping-An Wang: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences
Yanwei Cui: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences
Meizhen Li: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences
Ruoshi Wang: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences
Xiaoping Gou: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences
Jia Li: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: Abstract BES1 and BZR1 were originally identified as two key transcription factors specifically regulating brassinosteroid (BR)-mediated gene expression. They belong to a family consisting of six members, BES1, BZR1, BEH1, BEH2, BEH3, and BEH4. bes1 and bzr1 single mutants do not exhibit any characteristic BR phenotypes, suggesting functional redundancy of these proteins. Here, by generating higher order mutants, we show that a quintuple mutant is male sterile due to defects in tapetum and microsporocyte development in anthers. Our genetic and biochemical analyses demonstrate that BES1 family members also act as downstream transcription factors in the EMS1-TPD1-SERK1/2 pathway. Ectopic expression of both TPD1 and EMS1 in bri1-116, a BR receptor null mutant, leads to the accumulation of non-phosphorylated, active BES1, similar to activation of BES1 by BRI1-BR-BAK1 signaling. These data suggest that two distinctive receptor-like kinase-mediated signaling pathways share BES1 family members as downstream transcription factors to regulate different aspects of plant development.

Date: 2019
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DOI: 10.1038/s41467-019-12118-4

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