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Related Concept Videos

Dihybrid Crosses01:18

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Trihybrid Crosses02:27

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Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
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Redefining C and D in the petunia ABC.

Klaas Heijmans1, Kai Ament, Anneke S Rijpkema

  • 1Plant Genetics, Institute for Water and Wetland Research, Radboud University Nijmegen, 6525AJ Nijmegen, The Netherlands.

The Plant Cell
|June 19, 2012
PubMed
Summary
This summary is machine-generated.

Petunia flower development reveals overlapping functions of C-genes (PETUNIA MADS BOX GENE3, FLORAL BINDING PROTEIN6) in organ identity and floral determinacy. D-genes are not essential for ovule identity, which is shared among AG members.

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Area of Science:

  • Plant developmental genetics
  • Molecular biology
  • Evolutionary biology

Background:

  • The ABC(DE) model explains floral organ identity and development.
  • C-genes regulate stamen, carpel development, and floral determinacy.
  • D-genes were hypothesized to be crucial for ovule development.

Purpose of the Study:

  • Investigate the functions of petunia C-clade genes (PM3, FBP6) and D-genes (FBP7, FBP11).
  • Compare floral development gene functions between petunia, Arabidopsis, and Antirrhinum.
  • Elucidate the roles of MADS-box genes in petunia floral organ specification and determinacy.

Main Methods:

  • Comparative gene expression analysis
  • Gain-of-function experiments
  • Analysis of floral organ development in Petunia hybrida

Main Results:

  • Petunia C-clade genes (PM3, FBP6) show functional overlap in organ identity and floral determinacy, unlike Arabidopsis and Antirrhinum.
  • FBP6 has a unique role in style and stigma development.
  • Petunia D-genes (FBP7, FBP11) are not essential for ovule identity; this function is redundant among AG members.
  • D-genes contribute to floral determinacy.
  • Evidence for a post-transcriptional C-repression mechanism in petunia.
  • Expression of the B-gene TOMATO MADS BOX GENE6 depends on C-gene activity.

Conclusions:

  • Floral development pathways exhibit significant variation across eudicot species.
  • Functional redundancy and specialization of MADS-box genes contribute to diverse floral architectures.
  • A novel C-repression mechanism may exist in petunia, impacting floral development regulation.