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Planta

, Volume 219, Issue 2, pp 270–276 | Cite as

ERECTA is required for protection against heat-stress in the AS1/AS2 pathway to regulate adaxial–abaxial leaf polarity in Arabidopsis

  • Yiping Qi
  • Yue Sun
  • Lin Xu
  • Yuquan Xu
  • Hai Huang
Original Article

Abstract

In seed plants, formation of the adaxial–abaxial polarity is of primary importance in leaf patterning. Since Arabidopsis thaliana (L.) Heynh. genes ASYMMETRIC LEAVES1 (AS1) and ASYMMETRIC LEAVES2 (AS2) are key regulators in specifying adaxial leaf identity, and ERECTA is involved in the AS1/AS2 pathway for regulating adaxial–abaxial polarity [L. Xu et al. (2003) Development 130:4097–4107], we studied the physiological functions of the ERECTA protein in plant development. We analyzed the effects of different environmental conditions on a special leaf structure in the as1 and as2 mutants. This structure, called the lotus-leaf, reflects a severe loss of adaxial–abaxial polarity in leaves. Higher concentrations of salt or other osmotic substance and lower temperature severely affected plant growth both in the wild type and the mutants, but did not affect lotus-leaf frequency in the as1 and as2 mutants. as1 and as2 mutants exhibited a very low lotus-leaf frequency at 22°C, a temperature that favors Arabidopsis growth. The lotus-leaf frequency rose significantly with an increase in growth temperature, and only in plants that are in the erecta mutation background. These results suggest that ERECTA function is required for reducing plant sensitivity to heat stress during adaxial–abaxial polarity formation in leaves.

Keywords

Arabidopsis Asymmetric leaves1 (2ERECTA Heat stress Leaf polarity 

Abbreviations

AS1, AS2

ASYMMETRIC LEAVES1, 2

ER

ERECTA

Notes

Acknowledgement

The authors thank the Ohio State University Arabidopsis Stock Center and the Nottingham Arabidopsis Stock Center for providing as1-1, CS2340, as2-1, N230 and Lan seeds. This work was supported by grants from the Chinese Administration of Science and Technology (863), the Chinese National Scientific Foundation, and Shanghai Scientific Committee, to H.H.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Yiping Qi
    • 1
    • 2
  • Yue Sun
    • 3
  • Lin Xu
    • 1
    • 2
  • Yuquan Xu
    • 2
  • Hai Huang
    • 1
  1. 1.National Laboratory of Molecular Genetics, Shanghai Institute of Plant Physiology and Ecology, Shanghai Institute for Biological SciencesChinese Academy of SciencesShanghaiChina
  2. 2.College of Life Science and BiotechnologyShanghai Jiao Tong UniversityShanghaiChina
  3. 3.College of Life ScienceEast China Normal UniversityShanghaiChina

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