Reference "Comparative mapping in grasses. Wheat relationships"

Reference ID

4733

Title

Comparative mapping in grasses. Wheat relationships

Source

Molecular & General Genetics, 1995, vol. 248, pp. 744-754

Authors (7)

Van_Deynze-A-E	Nelson-J-C
Yglesias-E-S	Harrington-S-E
Braga-D-P	McCouch-S-R
Sorrells-M-E

Abstract

Conventionally, the genetics of species of the family Gramineae have been
studied separately. Comparative mapping using DNA markers offers a method of
combining the research efforts in each species. In this study, we developed
consensus maps for members of the Triticeae tribe (Triticum aestivum, T.
tauschii, and Hordeum spp.) and compared them to rice, maize and oat. The
aneuploid stocks available in wheat are invaluable for comparative mapping
because almost every DNA fragment can be allocated to a chromosome arm, thus
preventing erroneous conclusions about probes that could not be mapped due to a
lack of polymorphism between mapping parents. The orders of the markers detected
by probes mapped in rice, maize and oat were conserved for 93, 92 and 94% of the
length of Triticeae consensus maps, respectively. The chromosome segments
duplicated within the maize genome by ancient polyploidization events were
identified by homoeology of segments from two maize chromosomes to regions of
one Triticeae chromosome. Homoeologous segments conserved across Triticeae
species, rice, maize, and oat can be identified for each Triticeae chromosome.
Putative orthologous loci for several simply inherited and quantitatively
inherited traits in Gramineae species were identified.