J Integr Plant Biol. ›› 2012, Vol. 54 ›› Issue (6): 388-399.DOI: 10.1111/j.1744-7909.2012.01124.x

Special Issue: Plant Signal Transduction

• Plant-environmental Interactions • Previous Articles     Next Articles

Somatic Embryogenesis Receptor Kinases Control Root Development Mainly via Brassinosteroid-Independent Actions in Arabidopsis thaliana

Junbo Du1,2, Hongju Yin2, Shasha Zhang2, Zhuoyun Wei2, Baolin Zhao2, Jinghua Zhang2, Xiaoping Gou2, Honghui Lin1*, and Jia Li2*   

  1. 1School of Life Sciences, Sichuan University, Sichuan 610064, China
    2School of Life Sciences, Lanzhou University, Lanzhou 730000, China
  • Received:2011-12-16 Accepted:2012-04-16 Published:2012-04-24
  • About author:**Corresponding authors Tel (Fax): +86 28 8541 2485; E-mail: honghuilin@vip.sina.com Tel (Fax): +86 931 891 5662; E-mail: lijia@lzu.edu.cn


Brassinosteroids (BRs), a group of plant steroidal hormones, play critical roles in many aspects of plant growth and development. Previous studies showed that BRI1-mediated BR signaling regulates cell division and differentiation during Arabidopsis root development via interplaying with auxin and other phytohormones. Arabidopsis somatic embryogenesis receptor-like kinases (SERKs), as co-receptors of BRI1, were found to play a fundamental role in an early activation step of BR signaling pathway. Here we report a novel function of SERKs in regulating Arabidopsis root development. Genetic analyses indicated that SERKs control root growth mainly via a BR-independent pathway. Although BR signaling pathway is completely disrupted in the serk1 bak1 bkk1 triple mutant, the root growth of the triple mutant is much severely damaged than the BR deficiency or signaling null mutants. More detailed analyses indicated that the triple mutant exhibited drastically reduced expression of a number of genes critical to polar auxin transport, cell cycle, endodermis development and root meristem differentiation, which were not observed in null BR biosynthesis mutant cpd and null BR signaling mutant bri1-701.

Du J, Yin H, Zhang S, Wei Z, Zhao B, Zhang J, Gou X, Lin H, Li J (2012) Somatic embryogenesis receptor kinases control root development mainly via brassinosteroid-independent actions in Arabidopsis thaliana. J. Integr. Plant Biol. 54(6), 388–399.

Key words: Brassinolide, brassinosteroid, RLK, root development, SERK

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