Reference "Locating genomic regions associated with components of drought resistance in rice: comparative mapping within and across species"

Reference ID

7002

Title

Locating genomic regions associated with components of drought resistance in rice: comparative mapping within and across species

Source

Theoretical and applied genetics, 2001, vol. 103, pp. 19-29

Authors (13)

Zhang-J	Zheng-H-G	Aarti-A	Pantuwan-G
Nguyen-T-T	Tripathy-J-N	Sarial-A-K	Robin-S
Babu-R-C	Nguyen-B-D	Sarkarung-S	Blum-A
Nguyen-H-T

Abstract

Direct and indirect economic loss in the agricultural sector due to drought is
huge. With the advent of molecular-marker technology, research on drought
resistance in crop plants has shifted from physiological descriptions of the
phenomenon to genetic dissection of the mechanisms involved. Here, we report a
comprehensive study of mapping the drought resistance components (osmotic
adjustment and root traits) in a doubled-haploid rice (Oryza sativa L.)
population of 154 lines. A genetic linkage map consisting of 315 DNA markers was
constructed. A total of 41 quantitative trait loci (QTLs) were identified for
osmotic adjustment and root traits, and individually explained 8-38% of the
phenotypic variance. A region on chromosome 4 harbored major QTLs for several
root traits. Consistent QTLs for drought responses across genetic backgrounds
were detected and should be useful for marker-assisted selection towards the
incorporation of a trait of interest into an elite line. Comparative mapping
identified three conserved genomic regions associated with various physiological
responses to drought in several grass species. These results suggest that these
regions conferring drought adaptation have been conserved across grass species
during genome evolution and might be directly applied across species for the
improvement of drought resistance in cereal crops.