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First published online September 29, 2009; 10.1104/pp.109.143024

Plant Physiology 151:1155-1166 (2009)
© 2009 American Society of Plant Biologists

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Knockdown of CELL DIVISION CYCLE16 Reveals an Inverse Relationship between Lateral Root and Nodule Numbers and a Link to Auxin in Medicago truncatula1,[W],[OA]

Kavitha T. Kuppusamy2, Sergey Ivashuta3, Bruna Bucciarelli, Carroll P. Vance, J. Stephen Gantt and Kathryn A. VandenBosch*

Department of Plant Biology, University of Minnesota, St. Paul, Minnesota 55108 (K.T.K., S.I., J.S.G., K.A.V.); and United States Department of Agriculture Agricultural Research Service, Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108 (B.B., C.P.V.)

The postembryonic development of lateral roots and nodules is a highly regulated process. Recent studies suggest the existence of cross talk and interdependency in the growth of these two organs. Although plant hormones, including auxin and cytokinin, appear to be key players in coordinating this cross talk, very few genes that cross-regulate root and nodule development have been uncovered so far. This study reports that a homolog of CELL DIVISION CYCLE16 (CDC16), a core component of the Anaphase Promoting Complex, is one of the key mediators in controlling the overall number of lateral roots and nodules. A partial suppression of this gene in Medicago truncatula leads to a decrease in number of lateral roots and a 4-fold increase in number of nodules. The roots showing lowered expression of MtCDC16 also show reduced sensitivity to phytohormone auxin, thus providing a potential function of CDC16 in auxin signaling.

1 This work was supported by the U.S. Department of Energy (grant no. DE–FG02–01ER15201 to K.A.V.) and by funding from the National Science Foundation (award no. DBI–0421676 to J.S.G.). K.T.K. was supported by a Bernard and Jean Phinney Fellowship and a Plant and Microbial Genetics Institute Fellowship from University of Minnesota.

2 Present address: Department of Biology, University of Washington, Seattle, WA 98195.

3 Present address: Monsanto Company, 700 Chesterfield Parkway, Chesterfield, MO 63017.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Kathryn A. VandenBosch (vande102{at}umn.edu).

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

[OA] Open Access articles can be viewed online without a subscription.

www.plantphysiol.org/cgi/doi/10.1104/pp.109.143024

* Corresponding author; e-mail vande102{at}umn.edu.

Received June 16, 2009; accepted September 25, 2009; published September 29, 2009.

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