alexa Preferential translocation of boron to young leaves in Arabidopsis thaliana Regulated by the BOR1 Gene
Chemical Engineering

Chemical Engineering

Mass Spectrometry & Purification Techniques

Author(s): Mutsumi Yamagami, Junpei Takano, Toru Fujiwara, Hiroaki Hayashi, Junpei Takano

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A mutant of Arabidopsis thaliana, bor1-1 (Noguchi et al. 1997: Plant Physiol., 115, 901–916) requires high levels of boron (B) for normal growth. We analyzed the B-deficiency symptoms of bor1-1 mutant plants in detail. A low B supply retarded the growth of the mutant plants more evidently in leaves than in roots. In particular, cell expansion and formation of air spaces were severely impaired by B deficiency in young rosette leaves. Such defects in growth were correlated with the reduced contents of B in leaves. These defects were not observed when a sufficient amount of B was supplied. Uptake experiments with 10B-enriched tracer B demonstrated that B taken up through roots was preferentially transported to young leaves compared to old leaves in the wild-type plants under a low B supply. Such a preferential transport to young leaves was not evident in the mutant plants. In conclusion, our data demonstrated that in A. thaliana plants B is preferentially transported to young organs under a low B supply and that this transport process is controlled at least in part by the BOR1 gene.

This article was published in Soil Science and Plant Nutrition and referenced in Mass Spectrometry & Purification Techniques

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