Plant Genome II Conference
Town & Country Conference Center, San Diego, CA, January, 1994.
PG-II: GENETIC DISSECTION OF QUANTITATIVE TRAITS IN RICE USING
MOLECULAR MARKERS
GENETIC DISSECTION OF QUANTITATIVE TRAITS IN RICE USING
MOLECULAR MARKERS.
Masahiro Yano, Department of Crop Breeding, Hokuriku National
Agricultural Experiment Station, Joetsu, Niigata 943-01 Japan
Molecular markers make it possible to identify chromosomal
regions underlying important agricultural traits, especially
quantitative traits. This study employed the high density
molecular map and markers (nearly 800 markers) for localization
of the quantitative trait loci (QTLs) in rice. Genetical
analyses have been carried out based on the F2 population between
a Japonica variety, Nipponbare and an Indica variety, Kasalath.
Major seven morphological traits such as, culm length, pence
length, number of panicles, total number of seeds per panicle,
awn length, seed shattering habit and heading date were analyzed.
Transgressive segregation was observed for all of the traits in
the F2 population. The thirty six putative chromosomal regions
(LOD>2.0) were detected by the interval mapping for all the
traits. Some traits had single QTL with the significant LOD
score independently located in the chromosomal regions. Whereas
the estimated QTL area for some traits showed wide area of one
chromosomal region and showed more than one peak of the LOD
score, indicating the existence of two or more putative QTLS.
Under these circumstances, it was not possible to locate
precisely each QTL on the chromosomal regions. The analysis of
near isogenic lines or backcrossed inbred lines derived from this
cross combination would be necessary for the fine mapping of
these QTLs and estimation of their effects on the phenotypes.
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