Indian Society of Genetics & Plant Breeding

Marker-assisted selection and QTL mapping for yield, root morphology and agronomic traits using MASARB25 (aerobic) × Pusa Basmati 1460 F3 mapping populations

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Increasing scarcity of water has threatened the
sustainability of the irrigated rice production system and
hence the food security and livelihood of rice producers.
Experiments were conducted to study the correlation and
QTL mapping for yield, root-related and agronomic traits
under aerobic conditions using MASARB25 × Pusa
Basmati 1460 F3 mapping population. Yield of aerobic rice
variety MASARB25 was 9-12.3% higher than Basmati rice
variety Pusa Basmati 1460. MASARB25 had 9.32% higher
root length, 11.76% higher fresh root weight, 19.98% higher
dry root weight as compared to Pusa Basmati 1460. A total
of 15 QTLs associated with 10 traits were mapped on
chromosomes 2, 4, 6, 8, 9, and 11. qGY8.1 with an R2 value
of 36.3% and qGY2.1 with an R2 value of 29% and qRL8.1
with an R2 value of 27.2% were identified for root length
indicating the role of root traits in improving grain yield
under water limited conditions. A positive correlation was
found between root traits and yield under aerobic
conditions. Breeding lines with higher yield per plant, root
length, dry root biomass, length-breadth ratio, and with
Pusa Basmati 1460-specific alleles in a homozygous or
heterozygous condition at the BAD2 locus were identified
that will serve as novel material for the selection of stable
aerobic Basmati rice breeding lines.

Keywords: Aerobic, basmati, QTL, root traits, SSRs


Year: 2014
Volume: 74
Issue: Supplementry Issue
Article DOI: 10.5958/0975-6906.2014.00897.9
Print ISSN: 0019-5200
Online ISSN: 0975-6906


Sunita Jain info_circle
B. S. Mehla info_circle
R. K. Jain info_circle

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