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Plant Physiol, May 2001, Vol. 126, pp. 222-232

Analysis and Expression of the alpha -Expansin and beta -Expansin Gene Families in Maize1

Yajun Wu, Robert B. Meeley, and Daniel J. Cosgrove*

Department of Biology, Pennsylvania State University, University Park, Pennsylvania 16802 (Y.W., D.J.C.); and Pioneer Hi-Bred International Incorporated, 7300 NW 62nd Avenue, Johnston, Iowa 50131-1004 (R.B.M.)

Expansins comprise a multigene family of proteins in maize (Zea mays). We isolated and characterized 13 different maize expansin cDNAs, five of which are alpha -expansins and eight of which are beta -expansins. This paper presents an analysis of these 13 expansins, as well as an expression analysis by northern blotting with materials from young and mature maize plants. Some expansins were expressed in restricted regions, such as the beta -expansins ExpB1 (specifically expressed in maize pollen) and ExpB4 (expressed principally in young husks). Other expansins such as alpha -expansin Exp1 and beta -expansin ExpB2 were expressed in several organs. The expression of yet a third group was not detected in the selected organs and tissues. An analysis of expansin sequences from the maize expressed sequence tag collection is also presented. Our results indicate that expansin genes may have general, overlapping expression in some instances, whereas in other cases the expression may be highly specific and limited to a single organ or cell type. In contrast to the situation in Arabidopsis, beta -expansins in maize seem to be more numerous and more highly expressed than are alpha -expansins. The results support the concept that beta -expansins multiplied and evolved special functions in the grasses.

1 This work was supported by the U.S. Department of Energy (grant no. DE-FG02-84ER13179) and by the U.S. Department of Agriculture National Research Initiative (grant no. PENR-9601307).

* Corresponding author; email dCosgrove{at}psu.edu; fax 814- 865-9131.

© 2001 American Society of Plant Physiologists


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