Indian Society of Genetics & Plant Breeding

Mapping of QTL associated with root and related traits in DH population of rice (Oryza sativa L.)

Published on

Mapping of QTL associated with root and related traits
was undertaken in a DH population of indica x indica
cross (CT9993/IR62266). Totally 18 QTL, spread across
chromosomes were detected at threshold LaD of 2.20.
The alleles of IR62266 contributed to reduce plant
height, total plant length, enhance tiller number, root
number and root dry weight. As IR62266 is a short
parent with shallow root and more tiller number, such
an effect is explainable. A major QTL, explaining 20%
of variation for plant height and flanked by
RG109/ME10_14, was detected at LaD of 6.17. This
genomic segment is close to the map position of sd-1,
a major gene controlling semi-dwarfism. On the other
hand, of the two QTL for root: shoot length ratio, one
QTL on chromosome 1 (CD0345/RZ909) enhanced the
ratio. This indicates that inferior parent (IR62266) can
also contribute favorable alleles for root traits.

Keywords: Rice, drought resistance, quantitative trait loci (QTL), roots.


Year: 2002
Volume: 62
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



Download PDF