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First published online August 25, 2008

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A-maize-ing meristem regulation

The activity of plant meristems, which form new tissues and organs throughout a plant's life, determines the architecture of different plants. On p. 3013, George Chuck and colleagues reveal how the APETALA2 (AP2)-like genes indeterminate spikelet1 (ids1) and sister of indeterminate spikelet1 (sid1) determine inflorescence (the structure that displays a plant's flowers) architecture in maize. Grass flowers are organised on small branches called spikelets. In maize, the spikelet meristem is determinate - it initiates the formation of one floral meristem and then converts into a second floral meristem. ids1 controls the timing of this conversion. The authors show that ids1 functions with sid1 to control inflorescence meristem branching, floral meristem initiation and spikelet meristem determinacy. ids1 and sid1, they also report, are major targets of the tasselseed4 microRNA. Furthermore, ids1 and sid1, like Arabidopsis AP2, repress the expression of AGAMOUS-like transcription factors. However, AP2 mutants in Arabidopsis still make flowers, whereas ids1/sid1 mutants do not, revealing that AP2 genes have probably adopted different meristem functions during plant evolution.

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Related articles in Development:

Floral meristem initiation and meristem cell fate are regulated by the maize AP2 genes ids1 and sid1

George Chuck, Robert Meeley, and Sarah Hake
Development 2008 135: 3013-3019. [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?