Plant Physiology Preview
Published on January 23, 2003; 10.1104/pp.009902
Received June 12, 2002
Returned for revision July 14, 2002
Accepted November 21, 2002
Expression of an Expansin Gene Is Correlated with Root Elongation in Soybean1[w]
Dong-Keun Lee , Ji Hoon Ahn , Sang-Kee Song , Yang Do Choi , and Jong Seob Lee *
School of Biological Sciences, Seoul National University, Seoul 151-742, Korea (D.-K.L., J.H.A., S.-K.S., J.S.L.); and School of Agricultural Biotechnology and Crop Functional Genomics Center, Seoul National University, Suwon 441-744, Korea (Y.D.C.)
* Corresponding author; email: jongslee{at}plaza.snu.ac.kr.
Expansin is a family of proteins that catalyze long-term expansion of cell walls and has been considered a principal protein that affects cell expansion in plants. We have identified the first root-specific expansin gene in soybean (Glycine max), GmEXP1, which may be responsible for root elongation. Expression levels of GmEXP1 were very high in the roots of 1- to 5-d-old seedlings, in which rapid root elongation takes place. Furthermore, GmEXP1 mRNA was most abundant in the root tip region, where cell elongation occurs, but scarce in the region of maturation, where cell elongation ceases, implying that its expression is closely related to root development processes. In situ hybridization showed that GmEXP1 transcripts were preferentially present in the epidermal cells and underlying cell layers in the root tip of the primary and secondary roots. Ectopic expression of GmEXP1 accelerated the root growth of transgenic tobacco (Nicotiana tabacum) seedlings, and the roots showed insensitivity to obstacle-touching stress. These results imply that the GmEXP1 gene plays an important role in root development in soybean, especially in the elongation and/or initiation of the primary and secondary roots.
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