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Plant Cell Physiol. 2000 May;41(5):639-43.

Tissue-specific localization of mRNA for carrot homeobox genes, CHBs, in carrot somatic embryos.

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  • 1Department of Molecular Biomechanics, School of Life Science, The Graduate University for Advanced Studies, Myodaiji, Okazaki, Japan.


We examined spatial and temporal expression patterns of four carrot HD-Zip I homeobox genes in somatic embryos. The mRNAs for CHB3, CHB4 and CHB5 were accumulated preferentially in the innermost cortical cell layers of the embryo axis in the torpedo-shaped embryo. In contrast, the accumulation of CHB6 mRNA was restricted to procambial cells of the heart- and torpedo-shaped embryos. In the embryonic cotyledons and the hypocotyl of the seedlings, all of the mRNAs for the four genes were located in the vascular tissues. These findings indicate that different HD-Zip I homeobox genes may be involved in the differentiation of specific tissues during somatic embryogenesis.

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