Journal
SCIENTIFIC REPORTS
Volume 4, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep06194
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Funding
- NSF Doctoral Dissertation Improvement Grant [DEB 1110461]
- Hellman Family Faculty Fund
- UC MEXUS-CONACYT [12-571]
- CAPES/Fulbright Fellowship
- Miller Institute for Basic Research in Science, University of California, Berkeley, CONACyT [180098, 180380]
- DGAPA, UNAM [IN204011-3, IN226510-3]
- NSF IOS [0845641]
- Direct For Biological Sciences [1110461] Funding Source: National Science Foundation
- Division Of Environmental Biology [1110461] Funding Source: National Science Foundation
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [0845641] Funding Source: National Science Foundation
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The molecular genetic mechanisms underlying abaxial-adaxial polarity in plants have been studied as a property of lateral and flattened organs, such as leaves. In leaves, laminar expansion occurs as a result of balanced abaxial-adaxial gene expression. Over-or under-expression of either abaxializing or adaxializing genes inhibits laminar growth, resulting in a mutant radialized phenotype. Here, we show that co-option of the abaxial-adaxial polarity gene network plays a role in the evolution of stamen filament morphology in angiosperms. RNA-Seq data from species bearing laminar (flattened) or radial (cylindrical) filaments demonstrates that species with laminar filaments exhibit balanced expression of abaxial-adaxial (ab-ad) genes, while overexpression of a YABBY gene is found in species with radial filaments. This result suggests that unbalanced expression of ab-ad genes results in inhibition of laminar outgrowth, leading to a radially symmetric structure as found in many angiosperm filaments. We anticipate that co-option of the polarity gene network is a fundamental mechanism shaping many aspects of plant morphology during angiosperm evolution.
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