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ASYMMETRIC LEAVES2 gene, a member of LOB/AS2 family of Arabidopsis thaliana, causes an abaxializing leaves in transgenic cockscomb

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Abstract

The leaf primordium derives from the peripheral zone of shoot apical meristem. During the formation of leaf primordia, they need to establish the proximodistal, mediolateral, and ab/adaxial axes. Among these axes, the ab/adaxial axis might be the most important. ASYMMETRIC LEAVES2 (AS2) gene is a member of AS2/LATERAL ORGAN BOUNDARY (LOB) family of Arabidopsis thaliana. In this work, we transformed 35S:AS2 transgene constructs to cockscomb (Celosia cristata) via Agrobacterium tumefaciens. All primary transformants subsequently obtained were placed into phenotypic categories and self-pollinated. As a whole, a total of 44 T1 35S:AS2 cockscomb plants obtained were grouped into two major categories: (I) slightly wrinkled leaves (28/44), (II) extremely curved leaves (16/44), on the basis of their leaf phenotypes. Furthermore, we characterized the anatomical features of these malformed leaves; and found the transformation of adaxial cell types into abaxial cell ones. A series of data suggest that AS2 might be involved in the determination of abaxial polarity in cockscomb plants. However, a few research teams have reported that AS2 might be involved in the determination of adaxial polarity in leaf primodia of Arabidopsis thaliana. These data above indicate that the roles of the same ab/adaxial determinant might differ between distinct species. At last, the different function of AS2 in distinct species was discussed.

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Authors and Affiliations

  1. Gansu College of Traditional Chinese Medicine, Lanzhou, 730000, China

    Shao-Bo Sun & Lai-Sheng Meng

  2. School of Yuanpei, Shaoxing University, Shaoxing, 312000, China

    Jiang-Ping Song

  3. Division of Molecular and Life Sciences, Pohang University of Science and Technology, Hyojadong, Pohang, Kyungbuk, 790-784, Korea

    Lai-Sheng Meng

Authors
  1. Shao-Bo Sun
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Correspondence to Lai-Sheng Meng.

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S.-B. Sun and J.-P. Song contributed equally to this work.

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Sun, SB., Song, JP. & Meng, LS. ASYMMETRIC LEAVES2 gene, a member of LOB/AS2 family of Arabidopsis thaliana, causes an abaxializing leaves in transgenic cockscomb. Mol Biol Rep 39, 4927–4935 (2012). https://doi.org/10.1007/s11033-011-1288-y

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