Reference "Alignment of genetic maps and QTLs between inter- and intra-specific sorghum populations"

Reference ID

11121

Title

Alignment of genetic maps and QTLs between inter- and intra-specific sorghum populations

Source

Theor Appl Genet, 2006, vol. 112, pp. 1295-1305

Authors (9)

Feltus-F-A	Hart-G-E
Schertz-K-F	Casa-A-M
Kresovich-S	Abraham-S
Klein-P-E	Brown-P-J
Paterson-A-H

Abstract

To increase the value of associated molecular tools and also to begin to explore
the degree to which interspecific and intraspecific genetic variation in Sorghum
is attributable to corresponding genetic loci, we have aligned genetic maps
derived from two sorghum populations that share one common parent (Sorghum
bicolor L. Moench accession BTx623) but differ in morphological and
evolutionarily distant alternate parents (S. propinquum or S. bicolor accession
IS3620C). A total of 106 well-distributed DNA markers provide for map alignment,
revealing only six nominal differences in marker order that are readily
explained by sampling variation or mapping of paralogous loci. We also report a
total of 61 new QTLs detected from 17 traits in these crosses. Among eight
corresponding traits (some new, some previously published) that could be
directly compared between the two maps, QTLs for two (tiller height and tiller
number) were found to correspond in a non-random manner (P<0.05). For several
other traits, correspondence of subsets of QTLs narrowly missed statistical
significance. In particular, several QTLs for leaf senescence were near loci
previously mapped for 'stay-green' that have been implicated by others in
drought tolerance. These data provide strong validation for the value of
molecular tools developed in the interspecific cross for utilization in
cultivated sorghum, and begin to separate QTLs that distinguish among Sorghum
species from those that are informative within the cultigen (S. bicolor).