Letter abstract
Nature Genetics 39, 1517 - 1521 (2007)
Published online: 18 November 2007 | doi:10.1038/ng.2007.20
The maize tasselseed4 microRNA controls sex determination and meristem cell fate by targeting Tasselseed6/indeterminate spikelet1
George Chuck1, Robert Meeley2, Erin Irish3, Hajime Sakai4 & Sarah Hake1
In maize (Zea mays), sex determination occurs through abortion of female carpels in the tassel and arrest of male stamens in the ear. The Tasselseed6 (Ts6) and tasselseed4 (ts4) mutations permit carpel development in the tassel while increasing meristem branching, showing that sex determination and acquisition of meristem fate share a common pathway. We show that ts4 encodes a mir172 microRNA that targets APETALA2 floral homeotic transcription factors. Three lines of evidence suggest that indeterminate spikelet1 (ids1), an APETALA2 gene required for spikelet meristem determinacy, is a key target of ts4. First, loss of ids1 suppresses the ts4 sex determination and branching defects. Second, Ts6 mutants phenocopy ts4 and possess mutations in the microRNA binding site of ids1. Finally, IDS1 protein is expressed more broadly in ts4 mutants compared to wild type. Our results demonstrate that sexual identity in maize is acquired by limiting floral growth through negative regulation of the floral homeotic pathway.
- Plant Gene Expression Center, United States Department of Agriculture–Agricultural Research Service and the University of California, Albany, California 94710, USA.
- Pioneer, A DuPont Company, Johnston, Iowa 50131, USA.
- Department of Biological Sciences, University of Iowa, Iowa City, Iowa 52242, USA.
- DuPont Crop Genetics, Wilmington, Delaware 19880, USA.
Correspondence to: George Chuck1 e-mail: gchuck@nature.berkeley.edu
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