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Plant Physiol, October 2001, Vol. 127, pp. 486-496
The Maize CRINKLY4 Receptor Kinase Controls a Cell-Autonomous
Differentiation Response1
Philip W.
Becraft,*
Suk-Hoon
Kang, and
Sang-Gon
Suh
Zoology and Genetics/Agronomy Departments, 2116 Molecular Biology
Building, Iowa State University, Ames, Iowa 50011 (P.W.B.); and
Department of Horticulture, Yeungnam University, Daedong 214-1,
Kyongsan 712-749, Republic of Korea (S.-H.K., S.-G.S.)
The maize (Zea mays) CRINKLY4
(cr4) gene encodes a receptor-like kinase that controls
a variety of cell differentiation responses, particularly in the leaf
epidermis and in the aleurone of the endosperm. In situ hybridization
indicated that the cr4 transcript is present throughout
the shoot apical meristem and young leaf primordia. A genetic mosaic
analysis was conducted to test whether CR4 signal transduction directly
regulated the cellular processes associated with differentiation or
whether differentiation was controlled through the production of a
secondary signal. Genetic mosaics were created using  -rays to induce
chromosome breakage in a cr4/Cr4+ heterozygote. The
mutant cr4 allele was marked with the albino mutation,
Oy-700. Breakage and loss of the chromosome arm carrying
the wild-type alleles created a sector of albino, cr4
mutant tissue in an otherwise normal leaf. Analysis of such sectors
indicated that cr4 functions cell autonomously to
regulate cell morphogenesis, implying that CR4 signal transduction
regulates cell differentiation through strictly intracellular functions and not the production of secondary intercellular signals. However, several sectors altered cell patterning in wild-type tissue adjacent to
the sectors, suggesting that cr4 mutant cells are
defective in the production of other lateral signals.
1
This research was supported by the U.S. National
Science Foundation (grant no. IBN-9604426) and by the Basic Research
Program of the Korea Science and Engineering Foundation (grant no.
2000-1-22100-001-3). This is journal paper no. J-19277 of the Iowa
Agriculture and Home Economics Experiment Station (Ames, IA; project
no. 3379; supported by Hatch Act and State of Iowa funds).
*
Corresponding author; e-mail becraft{at}iastate.edu; fax
515-294-6755.
© 2001 American Society of Plant Physiologists
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