The Making of a Compound Leaf: Genetic Manipulation of Leaf Architecture in Tomato

The most distinctive morphogenetic feature of leaves is their being either simple or compound. To study the basis for this dichotomy, we have exploited the maize homeobox-containing Knotted-1 ( Kn1) gene in conjunction with mutations that alter the tomato compound leaf. We show that misexpression of...

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Bibliographic Details
Published in:Cell 1996-03, Vol.84 (5), p.735-744
Main Authors: Hareven, Dana, Gutfinger, Tamar, Parnis, Ania, Eshed, Yuval, Lifschitz, Eliezer
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Cloning, Molecular
DNA, Complementary
Gene Expression
Genes, Homeobox
Genes, Plant
Homeodomain Proteins - biosynthesis
Homeodomain Proteins - chemistry
Homeodomain Proteins - genetics
In Situ Hybridization
Lycopersicon esculentum
Lycopersicon esculentum - genetics
Lycopersicon esculentum - growth & development
Molecular Sequence Data
Morphogenesis
Phenotype
Plant Leaves - growth & development
Plant Proteins - biosynthesis
Plant Proteins - chemistry
Plant Proteins - genetics
Promoter Regions, Genetic
Recombinant Proteins - biosynthesis
Recombinant Proteins - chemistry
Sequence Homology, Amino Acid
Zea mays
Zea mays - genetics
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Summary:The most distinctive morphogenetic feature of leaves is their being either simple or compound. To study the basis for this dichotomy, we have exploited the maize homeobox-containing Knotted-1 ( Kn1) gene in conjunction with mutations that alter the tomato compound leaf. We show that misexpression of Kn1 confers different phenotypes on simple and compound leaves. Up to 2000 leaflets, organized in compound reiterated units, are formed in tomato leaves expressing Kn1. In contrast, Kn1 induces leaf malformations but fails to elicit leaf ramification in plants with inherent simple leaves such as Arabidopsis or in tomato mutant plants with simple leaves. Moreover, the tomato Kn1 ortholog, unlike that of Arabidopsis, is expressed in the leaf primordia. Presumably, the two alternative leaf forms are conditioned by different developmental programs in the primary appendage that is common to all types of leaves.
ISSN:0092-8674
1097-4172
DOI:10.1016/S0092-8674(00)81051-X