Indian Society of Genetics & Plant Breeding

Inheritance of grain shape and molecular tagging of the QTL for reduced grain width (gw) in rice (Oryza sativa L.)

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Grain shape as determined by the ratios of grain length
(L) to width (W) is an important trait affecting consumer
preferences and the rice markets worldwide. Study of its
inheritance and identification of linked molecular markers
are therefore essential for rice breeding with desirable
grain shapes. For this purpose, we used the Single
Segment Substitution Lines (3-S Lines) developed by
crossing HJX74 (medium grain) with Amol-3 (slender grain)
and Basmati 370 (slender grain). Slender shape (L: W > 3)
of grain was found to be monogenic recessive. The QTL
for grain width (gw8) was mapped to the distal end of the
chromosome 8 and was found to be linked with RM447
(0.0cM) and RM502 (2.5cM) which were located at a
distance of 55kb on the same clone AP005529 of rice
physical map. The study should facilitate map-based
cloning of the gene (QTL) and marker-assisted selection
(MAS) for slender shape of grain in rice.

Keywords: Grain shape, grain width, QTL tagging, 3-S lines, rice


Year: 2008
Volume: 68
Issue: 2
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906


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