Rhododendron Research Network Logo ARS

Rhododendron Research Network


 

Rhododendron Hybrid Pedigree Search

Introduction
The rhododendron hybrid pedigree search enables researchers to select hybrids that have a specific species or hybrid parent. The searchable database consists of 1150 rhododendron hybrids that are available from commercial sources. Any combination of seed or pollen and species or hybrid parent in a desired generation (i.e., 1st, 2nd, 3rd, 4th, or 5th) can be selected. A parentage tree is provided for each hybrid cultivar that satisfies the search criteria.

Research Application
Hybrids are an important tool for genetics research because the outcomes of hybridization allow us to determine the segregation of alleles. The classic work by Gregor Mendel, who investigated pea hybrids, was the first to use hybrids in this manner. Nowadays, geneticists are also interested in the distortion of Mendelian transmission, i.e. cases where offspring of heterozygous parents do not carry either allele with equal probability.

Pedigrees are an excellent tool for designing experiments with hybrids. Comparing the phenotype of parents with that of offspring in the F1 and F2 generations can be the first step to determining which genes are responsible for a trait, and the genetic mechanisms of inheritance (e.g. transmission distortion, gene dominance and dosage effects). Genome-wide association studies, which involve scanning whole genomes for candidate genes, can also incorporate pedigrees to inform analysis, allowing a more targeted approach to increase the speed of discovery.

Pedigrees themselves can also be used as data. For example, to build a recombination map, which reveals the relative influence of genetic linkages versus independent assortment, and has important consequences for inheritance. This information can also be used to discern the location and order of genes on the chromosomes.

In addition, pedigrees can be used in combination with genotypic and phenotypic data to understand how populations change over time, and to reveal patterns and processes related to genetic diversity. For example, in determining how patterns of gene flow have contributed to population decline, or how deleterious alleles and small population sizes contribute to disease susceptibility.

To Search Click Link   Rhododendron Parentage Search

 

Return to Research Network Home Page


American Rhododendron Society
P.O. Box 214, Great River, NY 11739
Website: www.rhododendron.org
Ph: 631-533-0375   Fax: 866-883-8019   E-Mail: member@arsoffice.org
1998-2018, ARS, All rights reserved.