Abstract
Lateral root formation in root cultures of Arabidopsis thaliana can be initiated by exogenous addition of auxin. In order to find cDNA clones of which the corresponding mRNAs accumulate during this process, a cDNA library was constructed from root cultures treated with the active auxin 1-naphthaleneacetic acid (1- NAA). Differential screening of this library with cDNA probes derived from mRNA populations isolated from root cultures treated with 1-NAA and the inactive analogue 2-naphthaleneacetic acid (2-NAA) led to the isolation of four cDNA clones, designated AIR1, AIR3, AIR9 and AIR12. Accumulation of the mRNAs starts between 4 and 8 h and continues till at least 24 h after addition of an active auxin. Sequence analysis revealed that AIR1 encodes a protein that is related to a large family of proteins that consist of a proline-rich or glycine- rich N-terminus and a hydrophobic, possibly membrane spanning C- terminus. The putative function of these proteins is coupling of the cell wall to the plasma membrane. Surprisingly, AIR1 lacks the proline-rich or glycine-rich N-terminus which is thought to be important for interaction with the cell wall. AIR3 encodes a subtilisin-like serine protease which is believed to be active outside the plant cell. Although AIR9 and AIR12 do not show any significant homology to sequences in the database, they are also predicted to function outside the cell. Our screening thus indicates that a variety of genes encoding extracellular proteins are activated during auxin-induced lateral root formation.
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Neuteboom, L.W., Ng, J.M., Kuyper, M. et al. Isolation and characterization of cDNA clones corresponding with mRNAs that accumulate during auxin-induced lateral root formation. Plant Mol Biol 39, 273–287 (1999). https://doi.org/10.1023/A:1006104205959
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DOI: https://doi.org/10.1023/A:1006104205959