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First published online September 7, 2007

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Root to shoot: de novo meristem assembly

Many plants can make an entire new body from a fragment of adult tissue. Cultured root explants of Arabidopsis, for example, can produce new shoot meristems, the source of the plant's above-ground organs, when supplied with the hormones auxin and cytokinin in the correct ratio. But how do these hormones control meristem self-organization within regenerating tissue? Gordon and co-workers have used live imaging of fluorescent versions of proteins involved in embryonic meristem patterning and also of reporters for hormone responses to investigate this question (see p. 3539). Their analysis suggests that shoot meristem progenitor cells are induced within specific hormone-response domains in the explant to form a cell mass that is then patterned to form a new shoot meristem. Furthermore, the homeodomain transcription factor WUSCHEL is required for specific steps during this process, as it is during embryonic meristem initiation. The researchers propose, therefore, that de novo meristem induction represents an accessible system in which to study hormone-induced patterning in Arabidopsis.

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Related articles in Development:

Pattern formation during de novo assembly of the Arabidopsis shoot meristem

Sean P. Gordon, Marcus G. Heisler, G. Venugopala Reddy, Carolyn Ohno, Pradeep Das, and Elliot M. Meyerowitz
Development 2007 134: 3539-3548. [Abstract] [Full Text]  

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Related articles in Development Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Search for Related Content Social Bookmarking                         What's this?