Genes and Chromomeres in Flowering Plants

Evolution of fruit development genes in flowering plants

The genetic mechanisms regulating dry fruit development and opercular dehiscence have been identified in Arabidopsis thaliana. In the bicarpellate silique, valve elongation and differentiation is controlled by FRUITFULL (FUL) that antagonizes SHATTERPROOF1-2 (SHP1/SHP2) and INDEHISCENT (IND) at the dehiscence zone where they control normal lignification. SHP1/2 are also repressed by REPLUMLESS ...

Genes and chromomeres: A puzzle in three dimensions.

DROSOPHILA polytene chromosomes have been (i.e., deletion or duplication) showed that these genes used for more than 60 years to explore eukaryotic are arranged in a discontinuous linear order and that chromosome organization and the nature of genes. T. S. the nodes (chromomeres) contain genes. Muller conPainter (1934), noting the distinctive and constant cluded that some chromomeres in the 1B1...

Neopolyploidy in Flowering Plants

Justin Ramsey1,2 and Douglas W. Schemske3 1Department of Botany, Box 355325, University of Washington, Seattle, Washington 98195-5325; email: [email protected] 2Present address: Department of Botany, University of Guelph, Guelph, Ontario N1G 2W1, Canada; email: [email protected] 3Department of Plant Biology and Kellogg Biological Station, Michigan State University, East Lansing, Michig...

Sex chromosomes in flowering plants.

Sex chromosomes in dioecious and polygamous plants evolved as a mechanism for ensuring outcrossing to increase genetic variation in the offspring. Sex specificity has evolved in 75% of plant families by male sterile or female sterile mutations, but well-defined heteromorphic sex chromosomes are known in only four plant families. A pivotal event in sex chromosome evolution, suppression of recomb...

REl'RODUCTlVE ALLOCATION IN FLOWERING PLANTS