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Expression of a Soybean Hydroxyproline-Rich Glycoprotein Gene Is Correlated with Maturation of Roots1

Ji Hoon Ahn, Yeonhee Choi, Sang-Gu Kim, Young Myung Kwon, Yang Do Choi, and Jong Seob Lee*

Department of Molecular Biology and Research Center for Cell Differentiation (J.H.A., Y.C., J.S.L.), and Department of Biology (S.-G.K., Y.M.K.), Seoul National University, Seoul 151-742, Korea; and Seoul National University, Seoul 151-742, KoreaDepartment of Agricultural Chemistry, Seoul National University, Suwon 441-744, Korea (Y.D.C.)

A novel extensin gene has been identified in soybean (Glycine max L.) that encodes a hydroxyproline-rich glycoprotein (SbHRGP3) with two different domains. In this study expression of SbHRGP3 was investigated during soybean root development. SbHRGP was expressed in roots of mature plants, as well as seedlings, and showed a distinct pattern of expression during root development. The expression of SbHRGP3 increased gradually during root development of seedlings and reached a maximum while the secondary roots were maturing. The maximum expression level was contributed mainly by the secondary roots rather than by the primary root. Furthermore, expression of SbHRGP3 was preferentially detected in the regions undergoing maturation of the primary and secondary roots. These results imply that the expression of SbHRGP3 is regulated in an organ- and development-specific manner and that in soybean SbHRGP3 expression may be required for root maturation, presumably for the cessation of root elongation. Wounding and sucrose in combination enhanced expression of SbHRGP3 in roots, whereas both wounding and sucrose were required for the expression of SbHRGP3 in leaves.

1   This work was supported in part by the Korea Science and Engineering Foundation through the Research Center for Cell Differentiation (J.S.L.) and the Research Center for Agricultural Bio-Materials (Y.D.C.) at Seoul National University.
*   Corresponding author; e-mail jongslee{at}plaza.snu.ac.kr; fax 82-2-872-1993.

Plant Physiol. (1998) 116: 671-679
Copyright Clearance Center:   0032-0889/98/116/0671/09
© 1998 American Society of Plant Physiologists




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D.-K. Lee, J. H. Ahn, S.-K. Song, Y. D. Choi, and J. S. Lee
Expression of an Expansin Gene Is Correlated with Root Elongation in Soybean
Plant Physiology, March 1, 2003; 131(3): 985 - 997.
[Abstract] [Full Text] [PDF]


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