ASYMMETRIC LEAVES2-LIKE1gene a member of the AS2/LOB family, controls proximal-distal patterning in Arabidopsis petals

A. Chalfun Junior, J. Franken, J.J. Mes, N. Marsch-Martinez, A.B. Pereira, G.C. Angenent

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    80 Citations (Scopus)


    The formation and the development of the floral organs require an intercalate expression of organ-specific genes. At the same time, meristem-specific genes are repressed to complete the differentiation of the organs in the floral whorls. In an Arabidopsis activation tagging population, a mutant affected in inflorescence architecture was identified. This gain-of-function mutant, designateddownwards siliques1 (dsl1-D), has shorter internodes and the lateral organs such as flowers are bending downwards, similar to the loss-of-function brevipedicellus (bp) mutant. The affected gene in dsl1-D appeared to be ASYMMETRIC LEAVES2-LIKE1 (ASL1)/LATERAL ORGAN BOUNDARIESdomain gene 36 (LBD36), which is a member of the ASYMMETRIC LEAVES2 (AS2)/LATERAL ORGAN BOUNDARIES (LOB) domain gene family. Analysis of the loss-of-function mutant asl1/lbd36 did not show morphological aberration. Double mutant analysis of asl1/lbd36 together with as2, the ASL1/LBD36 closest homologue, demonstrates that these two members of the AS2/LOB family act partially redundant to control cell fate determination in Arabidopsis petals. Moreover, molecular analysis revealed that overexpression of ASL1/LBD36 leads to repression of the homeobox gene BP, which supports the model that an antagonistic relationship between ASL/LBD and homeobox members is required for the differentiation of lateral organs
    Original languageEnglish
    Pages (from-to)559-575
    JournalPlant Molecular Biology
    Issue number4
    Publication statusPublished - 2005


    • knotted1-like homeobox gene
    • asymmetric interlaced pcr
    • inflorescence architecture
    • cell-differentiation
    • rough-sheath2 gene
    • leaf development
    • lateral organs
    • expression
    • thaliana
    • activation

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