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THE PLANT CELL, Vol 8, Issue 8 1277-1289, Copyright © 1996 by American Society of Plant Biologists

RESEARCH ARTICLES

KNAT1 Induces Lobed Leaves with Ectopic Meristems When Overexpressed in Arabidopsis

G. Chuck, C. Lincoln and S. Hake
Department of Plant Biology, University of California-Berkeley, Berkeley, California 94720

Plant development depends on the activity of apical meristems, which are groups of indeterminate cells whose derivatives elaborate the organs of the mature plant. Studies of knotted1 (kn1) and related gene family members have determined potential roles for homeobox genes in the function of shoot meristems. The Arabidopsis kn1-like gene, KNAT1, is expressed in the shoot apical meristem and not in determinate organs. Here, we show that ectopic expression of KNAT1 in Arabidopsis transforms simple leaves into lobed leaves. The lobes initiate in the position of serrations yet have features of leaves, such as stipules, which form in the sinus, the region at the base of two lobes. Ectopic meristems also arise in the sinus region close to veins. Identity of the meristem, that is, vegetative or floral, depends on whether the meristem develops on a rosette or cauline leaf, respectively. Using in situ hybridization, we analyzed the expression of KNAT1 and another kn1-like homeobox gene, SHOOT MERISTEMLESS, in cauliflower mosaic virus 35S::KNAT1 transformants. KNAT1 expression is strong in vasculature, possibly explaining the proximity of the ectopic meristems to veins. After leaf cells have formed a layered meristem, SHOOT MERISTEMLESS expression begins in only a subset of these cells, demonstrating that KNAT1 is sufficient to induce meristems in the leaf. The shootlike features of the lobed leaves are consistent with the normal domain of KNAT1's expression and further suggest that kn1-related genes may have played a role in the evolution of leaf diversity.


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Developmental Abnormalities and Reduced Fruit Softening in Tomato Plants Expressing an Antisense Rab11 GTPase Gene
PLANT CELL, August 1, 2001; 13(8): 1819 - 1833.
[Abstract] [Full Text] [PDF]

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 Plant Physiol.Home page
G. Frugis, D. Giannino, G. Mele, C. Nicolodi, A. Chiappetta, M. B. Bitonti, A. M. Innocenti, W. Dewitte, H. Van Onckelen, and D. Mariotti
Overexpression of KNAT1 in Lettuce Shifts Leaf Determinate Growth to a Shoot-Like Indeterminate Growth Associated with an Accumulation of Isopentenyl-Type Cytokinins
Plant Physiology, August 1, 2001; 126(4): 1370 - 1380.
[Abstract] [Full Text] [PDF]

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 Genes Dev.Home page
T. Tantikanjana, J. W.H. Yong, D. S. Letham, M. Griffith, M. Hussain, K. Ljung, G. Sandberg, and V. Sundaresan
Control of axillary bud initiation and shoot architecture in Arabidopsis through the SUPERSHOOT gene
Genes & Dev., June 15, 2001; 15(12): 1577 - 1588.
[Abstract] [Full Text] [PDF]

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 Plant Physiol.Home page
H. Li, J.-J. Shen, Z.-L. Zheng, Y. Lin, and Z. Yang
The Rop GTPase Switch Controls Multiple Developmental Processes in Arabidopsis
Plant Physiology, June 1, 2001; 126(2): 670 - 684.
[Abstract] [Full Text] [PDF]

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 Plant CellHome page
M. Tsiantis
Control of Shoot Cell Fate: Beyond Homeoboxes
PLANT CELL, April 1, 2001; 13(4): 733 - 738.
[Full Text]

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 Genes Dev.Home page
T. Sakamoto, N. Kamiya, M. Ueguchi-Tanaka, S. Iwahori, and M. Matsuoka
KNOX homeodomain protein directly suppresses the expression of a gibberellin biosynthetic gene in the tobacco shoot apical meristem
Genes & Dev., March 1, 2001; 15(5): 581 - 590.
[Abstract] [Full Text]

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 DevelopmentHome page
E Semiarti, Y Ueno, H Tsukaya, H Iwakawa, C Machida, and Y Machida
The ASYMMETRIC LEAVES2 gene of Arabidopsis thaliana regulates formation of a symmetric lamina, establishment of venation and repression of meristem-related homeobox genes in leaves
Development, January 5, 2001; 128(10): 1771 - 1783.
[Abstract] [PDF]

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 DevelopmentHome page
S Takada, K Hibara, T Ishida, and M Tasaka
The CUP-SHAPED COTYLEDON1 gene of Arabidopsis regulates shoot apical meristem formation
Development, January 4, 2001; 128(7): 1127 - 1135.
[Abstract] [PDF]

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 Proc. Natl. Acad. Sci. USAHome page
L. E. Graham, M. E. Cook, and J. S. Busse
Special Feature: The origin of plants: Body plan changes contributing to a major evolutionary radiation
PNAS, April 25, 2000; 97(9): 4535 - 4540.
[Full Text] [PDF]

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 GeneticsHome page
C. Pozzi, P. Faccioli, V. Terzi, A. M. Stanca, S. Cerioli, P. Castiglioni, R. Fink, R. Capone, K. J. Müller, G. Bossinger, et al.
Genetics of Mutations Affecting the Development of a Barley Floral Bract
Genetics, March 1, 2000; 154(3): 1335 - 1346.
[Abstract] [Full Text]

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 Plant Physiol.Home page
M. Frank, H.-M. Rupp, E. Prinsen, V. Motyka, H. Van Onckelen, and T. Schmulling
Hormone Autotrophic Growth and Differentiation Identifies Mutant Lines of Arabidopsis with Altered Cytokinin and Auxin Content or Signaling
Plant Physiology, March 1, 2000; 122(3): 721 - 730.
[Abstract] [Full Text] [PDF]

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 DevelopmentHome page
N Ori, Y Eshed, G Chuck, J. Bowman, and S Hake
Mechanisms that control knox gene expression in the Arabidopsis shoot
Development, January 12, 2000; 127(24): 5523 - 5532.
[Abstract] [PDF]

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 DevelopmentHome page
E Vollbrecht, L Reiser, and S Hake
Shoot meristem size is dependent on inbred background and presence of the maize homeobox gene, knotted1
Development, January 7, 2000; 127(14): 3161 - 3172.
[Abstract] [PDF]

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 Plant CellHome page
T. Sakamoto, A. Nishimura, M. Tamaoki, M. Kuba, H. Tanaka, S. Iwahori, and M. Matsuoka
The Conserved KNOX Domain Mediates Specificity of Tobacco KNOTTED1-Type Homeodomain Proteins
PLANT CELL, August 1, 1999; 11(8): 1419 - 1432.
[Abstract] [Full Text]

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 Plant CellHome page
N. Ori, M. T. Juarez, D. Jackson, J. Yamaguchi, G. M. Banowetz, and S. Hake
Leaf Senescence Is Delayed in Tobacco Plants Expressing the Maize Homeobox Gene knotted1 under the Control of a Senescence-Activated Promoter
PLANT CELL, June 1, 1999; 11(6): 1073 - 1080.
[Abstract] [Full Text]

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 Plant Physiol.Home page
G. Frugis, D. Giannino, G. Mele, C. Nicolodi, A. M. Innocenti, A. Chiappetta, M. Beatrice Bitonti, W. Dewitte, H. Van Onckelen, and D. Mariotti
Are Homeobox Knotted-Like Genes and Cytokinins the Leaf Architects?
Plant Physiology, February 1, 1999; 119(2): 371 - 374.
[Full Text]

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 DevelopmentHome page
J Alvarez and D. Smyth
CRABS CLAW and SPATULA, two Arabidopsis genes that control carpel development in parallel with AGAMOUS
Development, January 6, 1999; 126(11): 2377 - 2386.
[Abstract] [PDF]

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 DevelopmentHome page
K Lynn, A Fernandez, M Aida, J Sedbrook, M Tasaka, P Masson, and M. Barton
The PINHEAD/ZWILLE gene acts pleiotropically in Arabidopsis development and has overlapping functions with the ARGONAUTE1 gene
Development, January 2, 1999; 126(3): 469 - 481.
[Abstract] [PDF]

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 Proc. Natl. Acad. Sci. USAHome page
A. Sundas-Larsson, M. Svenson, H. Liao, and P. Engstrom
A homeobox gene with potential developmental control function in the meristem of the conifer Picea abies
PNAS, December 8, 1998; 95(25): 15118 - 15122.
[Abstract] [Full Text] [PDF]

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 Plant CellHome page
B. Veit
Leaf Initiation: New Developments in an Expanding Field
PLANT CELL, September 1, 1998; 10(9): 1407 - 1412.
[Full Text]

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 Plant Physiol.Home page
B.-J. Janssen, L. Lund, and N. Sinha
Overexpression of a Homeobox Gene, LeT6, Reveals Indeterminate Features in the Tomato Compound Leaf
Plant Physiology, July 1, 1998; 117(3): 771 - 786.
[Abstract] [Full Text]

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 DevelopmentHome page
M. Timmermans, N. Schultes, J. Jankovsky, and T Nelson
Leafbladeless1 is required for dorsoventrality of lateral organs in maize
Development, January 8, 1998; 125(15): 2813 - 2823.
[Abstract] [PDF]

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 DevelopmentHome page
J. Long and M. Barton
The development of apical embryonic pattern in Arabidopsis
Development, January 8, 1998; 125(16): 3027 - 3035.
[Abstract] [PDF]

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 DevelopmentHome page
R. Williams-Carrier, Y. Lie, S Hake, and P. Lemaux
Ectopic expression of the maize kn1 gene phenocopies the Hooded mutant of barley
Development, January 10, 1997; 124(19): 3737 - 3745.
[Abstract] [PDF]

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 DevelopmentHome page
R. Kerstetter, D Laudencia-Chingcuanco, L. Smith, and S Hake
Loss-of-function mutations in the maize homeobox gene, knotted1, are defective in shoot meristem maintenance
Development, January 8, 1997; 124(16): 3045 - 3054.
[Abstract] [PDF]


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