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Plant and Cell Physiology, 1999, Vol. 40, No. 5 469-476
© 1999

Maize Genes Specifically Expressed in the Outermost Cells of Root Cap

Takashi Matsuyama1, Naoki Yasumura1, Masao Funakoshi, Yasuyuki Yamada and Takashi Hashimoto2

Graduate School of Biological Sciences, Nara Institute of Science and Technology Nara, 630-0101 Japan

2To whom correspondence should be addressed. e-mail: hasimoto{at}bs.aist-nara.ac.jp

The cells at the periphery of the root cap are continuously sloughed off from the root into the mucilage, and are thought to be programmed to die. By using subtractive hybridization/differential screening and a transmembrane-domain trapping screening strategy involving expression screening in transfected COS-7 cells, we isolated two related maize cDNAs (ZmRCP1 and ZmRCP2) that are specifically expressed in the outermost one to three cells of the cap. ZmRCP1 and ZmRCP2 are homologous proteins of 37 kDa mature polypeptides with a region of regularly-spaced Cys residues and putative N-terminal signal peptides, and represent members of a novel protein family which is conserved among angiosperm and gymnosperm.

1 These two authors contributed equally to this work.

(Received December 17, 1998; Accepted February 17, 1999)
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