J Integr Plant Biol. ›› 2010, Vol. 52 ›› Issue (11): 952-958.DOI: 10.1111/j.1744-7909.2010.00981.x

• Cell and Developmental Biology • Previous Articles     Next Articles

Microfilament Dynamics is Required for Root Growth under Alkaline Stress in Arabidopsis

Yue Zhou1,2, Zijun Yang3, Guangqin Guo1 and Yan Guo2*   

  1. 1Institute of Cell Biology, School of Life Sciences, Lanzhou University, Lanzhou 730000, China
    2National Institute of Biological Sciences, Beijing, 7 Science Park Road, Zhongguancun Life Science Park, Beijing 102206, China
    3Agricultural Technology Center, Huadian City, Jilin Province 132400, China
  • Received:2010-04-08 Accepted:2010-06-13 Published:2010-07-01
  • About author:*Corresponding author Tel: +86 10 8072 3279; Fax: +86 10 8072 6671; E-mail:guoyan@nibs.ac.cn

Abstract:

The microfilament (MF) cytoskeleton has crucial functions in plant development. Recent studies have revealed the function of MFs in diverse stress response. Alkaline stress is harmful to plant growth; however, it remains unclear whether the MFs play a role in alkaline stress. In the present study, we find that blocking MF assembly with latrunculin B (Lat B) leads to inhibition of plant root growth, and stabilization of MFs with phalloidin does not significantly affect plant root growth under normal conditions. In high external pH conditions, MF de-polymerization is induced and that associates with the reduction of root growth; phalloidin treatment partially rescues this reduction. Moreover, Lat B treatment further decreases the survival rate of seedlings growing in high external pH conditions. However, a high external pH (8.0) does not affect MF stability in vitro. Taken together, our results suggest that alkaline stress may trigger a signal that leads the dynamics of MFs and in turn regulates root growth.

Zhou Y, Yang Z, Guo G, Guo Y (2010) Microfilament dynamics is required for root growth under alkaline stress in Arabidopsis. J. Integr. Plant Biol. 52(11), 952–958.

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