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Submitted on December 8, 2005
Accepted on February 28, 2006
Rice Domestication by Reducing Shattering
Changbao Li 1 and Tao Sang 1*
1 Department of Plant Biology, Michigan State University, East Lansing, MI 48824, USA.
* To whom correspondence should be addressed.
Tao Sang , E-mail: sang{at}msu.edu
Crop domestication frequently began with the selection of plantsthat did not naturally shed ripe fruits or seeds. The reductionin grain shattering that led to cereal domestication involvedgenetic loci of large effect. The molecular basis of this keydomestication transition, however, remains unknown. Here weshow that human selection of an amino acid substitution in thepredicted DNA-binding domain encoded by a gene of previouslyunknown function was primarily responsible for the reductionof grain shattering in rice domestication. The substitutionundermined the gene function necessary for the normal developmentof an abscission layer that controls the separation of a grainfrom the pedicel.
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