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First published online July 1, 2005; 10.1104/pp.105.063297

Plant Physiology 138:2386-2395 (2005)
© 2005 American Society of Plant Biologists

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GENETICS, GENOMICS, AND MOLECULAR EVOLUTION

Identification of a Gene in the Process of Being Lost from the Genus Agrostis1,[w]

Huaijun Michael Li, David Rotter, Stacy A. Bonos, William A. Meyer and Faith C. Belanger*

Department of Plant Biology and Pathology and The Biotechnology Center for Agriculture and the Environment, Cook College, Rutgers University, New Brunswick, New Jersey 08903

Lineage-specific gene loss is considered one of the processes contributing to speciation and genome diversity. Such gene loss has been inferred from interspecies comparisons of orthologous DNA segments. Examples of intraspecific gene loss are rare. Here we report identification of a gene, designated Crs-1 (creeping specific-1), that appears to be in the process of being lost from heterozygous populations of the species creeping bentgrass (Agrostis stolonifera). The Crs-1 gene encodes a protein with an N-terminal dirigent protein domain and a C-terminal lectin domain and is similar to the maize (Zea mays) {beta}-glucosidase aggregating factor. Most individual creeping bentgrass plants examined are lacking Crs-1. Some individuals are hemizygous for the Crs-1 locus, indicating major haplotype noncolinearity at that locus. Crs-1 was not detected in several other Agrostis species, indicating it is being lost from the genus. The Crs-1 locus in creeping bentgrass provides a rare example of the evolutionary process of gene loss occurring within a plant species.

1 This work was supported in part by the United States Golf Association.

[w] The online version of this article contains Web-only data.

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.105.063297.

* Corresponding author; e-mail belanger{at}aesop.rutgers.edu; fax 732–932–6535.

Received March 25, 2005; returned for revision April 28, 2005; accepted May 9, 2005.


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