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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (11): 2042-2051.doi: 10.3724/SP.J.1006.2012.02042

• CROP GENETICS & BREEDING · GERMPLASM RESOURCES · MOLECULAR GENETICS • Previous Articles     Next Articles

Ectopic Expression of TaYAB2, a Member of YABBY Gene Family in Wheat, Causes Partial Abaxialization of Adaxial Epidermises of Leaves in Arabidopsis

ZHAO Xiang-Yu**,XIE Hong-Tao**,CHEN Xiang-Bin,WANG Shuai-Shuai,ZHANG Xian-Sheng*   

  1. State Key Laboratory of Crop Biology / Shandong Key Laboratory of Crop Biology / College of Life Sciences, Shandong Agricultural University, Tai’an 271018, China
  • Received:2012-01-10 Revised:2012-06-10 Online:2012-11-12 Published:2012-07-27
  • Contact: 张宪省, E-mail: zhangxs@sdau.edu.cn, Tel: 0538-8249418 ** 同等贡献(Contributed equally to this work)

Abstract:

Adaxial-abaxial polarity is an important feature of lateral organs. To study the molecular mechanism of polarity establishment, we isolated a YABBY gene, designated TaYAB2, from the young leaves of wheat. TaYAB2 has a zinc finger-like domain in the N terminus and a YABBY domain in the C terminus. Sequence comparison showed that TaYAB2 is a putative member of the YABBY gene family in wheat. Further expression analysis indicated that TaYAB2 was widely expressed in the lateral organs of wheat. Ectopic expression of TaYAB2 inArabidopsis caused the partial abaxialization of the adaxial epidermises of leaves with the promotion of the transcript levels of abaxial identity genes, for example, FIL/YAB1, YAB3, and KAN1. These results indicate that TaYAB2 affects the establishment of adaxial-abaxial polarity when ectopically expressed in Arabidopsis.

Key words: Adaxial-abaxial polarity, Leaf development, TaYAB2, Wheat, Transgene

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