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  • 1. Bhalerao, Rishikesh P
    et al.
    Eklöf, Jan
    Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, The Swedish University of Agricultural Sciences, SE-901 83, Umeå, Sweden.
    Ljung, Karin
    Marchant, Alan
    Bennett, Malcolm
    Sandberg, Göran
    Shoot-derived auxin is essential for early lateral root emergence in Arabidopsis seedlings2002In: The Plant Journal, ISSN 0960-7412, E-ISSN 1365-313X, Vol. 29, no 3, p. 325-332Article in journal (Refereed)
    Abstract [en]

    Lateral root formation is profoundly affected by auxins. Here we present data which indicate that light influences the formation of indole-3-acetic acid (IAA) in germinating Arabidopsis seedlings. IAA transported from the developing leaves to the root system is detectable as a short-lived pulse in the roots and is required for the emergence of the lateral root primordia (LRP) during early seedling development. LRP emergence is inhibited by the removal of apical tissues prior to detection of the IAA pulse in the root, but this treatment has minimal effects on LRP initiation. Our results identify the first developing true leaves as the most likely source for the IAA required for the first emergence of the LRP, as removal of cotyledons has only a minor effect on LRP emergence in contrast to removal of the leaves. A basipetal IAA concentration gradient with high levels of IAA in the root tip appears to control LRP initiation, in contrast to their emergence. A significant increase in the ability of the root system to synthesize IAA is observed 10 days after germination, and this in turn is reflected in the reduced dependence of the lateral root emergence on aerial tissue-derived auxin at this stage. We propose a model for lateral root formation during early seedling development that can be divided into two phases: (i) an LRP initiation phase dependent on a root tip-localized IAA source, and (ii) an LRP emergence phase dependent on leaf-derived IAA up to 10 days after germination.

  • 2.
    Eklöf, Jan
    Institutionen för skoglig genetik och växtfysiologi, Sveriges lantbruksuniversitet, 901 83 Umeå.
    Control of lateral root development in Arabidopsis thaliana2001Licentiate thesis, comprehensive summary (Other academic)
  • 3. Marchant, Alan
    et al.
    Bhalerao, Rishikesh
    Casimiro, Ilda
    Eklöf, Jan
    Department of Forest Genetics and Plant Physiology, The Swedish University of Agricultural Sciences, S-901 83, Umeå, Sweden.
    Casero, Pedro J
    Bennett, Malcolm
    Sandberg, Goran
    AUX1 promotes lateral root formation by facilitating indole-3-acetic acid distribution between sink and source tissues in the Arabidopsis seedling2002In: The Plant Cell, ISSN 1040-4651, E-ISSN 1532-298X, Vol. 14, no 3, p. 589-597Article in journal (Refereed)
    Abstract [en]

    Arabidopsis root architecture is regulated by shoot-derived signals such as nitrate and auxin. We report that mutations in the putative auxin influx carrier AUX1 modify root architecture as a result of the disruption in hormone transport between indole-3-acetic acid (IAA) source and sink tissues. Gas chromatography-selected reaction monitoring-mass spectrometry measurements revealed that the aux1 mutant exhibited altered IAA distribution in young leaf and root tissues, the major IAA source and sink organs, respectively, in the developing seedling. Expression studies using the auxin-inducible reporter IAA2::uidA revealed that AUX1 facilitates IAA loading into the leaf vascular transport system. AUX1 also facilitates IAA unloading in the primary root apex and developing lateral root primordium. Exogenous application of the synthetic auxin 1-naphthylacetic acid is able to rescue the aux1 lateral root phenotype, implying that root auxin levels are suboptimal for lateral root primordium initiation in the mutant.

  • 4. Olsson, Håkan
    et al.
    Skånes, Helle
    Tulldahl, Michael
    Wikström, Sofia
    Kautsky, Hans
    Rydell, Bengt
    Årnfelt, Erik
    Eklöf, Jan
    Steinvall, Ove
    Flygburen laser och digitala bilder för kartering och övervakning av akvatisk och terrester miljö2014Report (Other academic)
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