Development 130, 161-172 161 © 2003 The Company of Biologists Ltd doi:10.1242/dev.00196 The BLADE-ON-PETIOLE 1 gene controls leaf pattern formation through the modulation of meristematic activity in Arabidopsis Chan Man Ha1, Gyung-Tae Kim2,*, Byung Chul Kim1, Ji Hyung Jun1, Moon Soo Soh1,†, Yoshihisa Ueno3, Yasunori Machida3, Hirokazu Tsukaya2 and Hong Gil Nam1,‡ 1Division of Molecular Life Science, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang, Kyungbuk, 790- 784, Korea 2National Institute for Basic Biology/Center for Integrative Bioscience, Myodaiji-cho, Okazaki 444-8585, Japan 3Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan *Present address: Department of Life Science and Resources, Dong-A University, Hadan-2-dong 840, Busan, 604-714, Korea †Present address: Kumho Life and Environmental Science Laboratory, Oryong-dong, Gwangju, 500-712, Korea ‡Author for correspondence (e-mail:
[email protected]) Accepted 8 October 2002 SUMMARY The plant leaf provides an ideal system to study the within the context of the leaf proximodistality, mechanisms of organ formation and morphogenesis. The dorsoventrality and heteroblasty. BOP1 appears to regulate key factors that control leaf morphogenesis include the meristematic activity in organs other than leaves, since the timing, location and extent of meristematic activity during mutation also causes some ectopic outgrowths on stem cell division and differentiation. We identified an surfaces and at the base of floral organs. Three class I knox Arabidopsis mutant in which the regulation of meristematic genes, i.e., KNAT1, KNAT2 and KNAT6, were expressed activities in leaves was aberrant.