New gene plays central role in plant architecture and crop domestication
In 1909, while harvesting a typical corn crop (Zea mays) in Illinois, a field worker noticed a plant so unusual that it was initially believed to be a new species. Its "peculiarly shaped ear" was "laid aside as a curiosity" and the specimen was designated Zea ramosa (from the Latin ramosus, "having many branches"). Due to the alteration of a single gene, later named ramosa1, both the ear and the tassel of the plant were more highly branched than usual, leading to loose, crooked kernel rows and to a tassel that was far bushier than the tops of normal corn plants.
Now, researchers at Cold Spring Harbor Laboratory in New York have isolated the ramosa1 gene and shown how it controls the arrangement and length of flower-bearing branches in corn, related cereal crops, and ornamental grasses. The study indicates that during the domestication of corn from its wild ancestor (teosinte), early farmers selected plants with special versions of the ramosa1 gene that suppressed branching in the ear, leading to the straight rows of kernels and the compact ears of modern-day corn on the cob. The findings are described in the July 24 advance online edition of the journal Nature.
Peter Sherwood | EurekAlert!
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