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Cytokinin Regulates Compound Leaf Development in Tomato
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Journal Article
Cytokinin Regulates Compound Leaf Development in Tomato
2010
Overview
Leaf shape diversity relies on transient morphogenetic activity in leaf margins. However, how this morphogenetic capacity is maintained is still poorly understood. Here, we uncover a role for the hormone cytokinin (CK) in the regulation of morphogenetic activity of compound leaves in tomato (Solanum lycopersicum). Manipulation of CK levels led to alterations in leaf complexity and revealed a unique potential for prolonged growth and morphogenesis in tomato leaves. We further demonstrate that the effect of CK on leaf complexity depends on proper localization of auxin signaling. Genetic analysis showed that reduction of CK levels suppresses the effect of Knotted1 like homeobox (KNOXI) proteins on leaf shape and that CK can substitute for KNOXI activity at the leaf margin, suggesting that CK mediates the activity of KNOXI proteins in the regulation of leaf shape. These results imply that CK regulates flexible leaf patterning by dynamic interaction with additional hormones and transcription factors.
Publisher
American Society of Plant Biologists
Subject
/ Gene Expression Regulation, Developmental
/ Gene Expression Regulation, Plant
/ genetic techniques and protocols
/ genetics
/ Homeodomain Proteins - genetics
/ Homeodomain Proteins - metabolism
/ Hormones
/ Indoleacetic Acids - metabolism
/ Leaves
/ Lycopersicon esculentum - genetics
/ Lycopersicon esculentum - growth & development
/ Lycopersicon esculentum - metabolism
/ Plant Leaves - growth & development
/ Plants
/ Tomatoes
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