Indian Society of Genetics & Plant Breeding

Effect of QTLs controlling grain yield under drought stress in the genetic background of ADT45 rice variety

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Drought is a major production constraint in rain-fed upland
and rainfed lowland ecosystems of rice cultivation. A set of
two backcross inbred lines (BILs) harboring mega effect
QTLs controlling grain yield under stress were developed
in the genetic background of ADT 45 through marker
assisted selection (MAS) and evaluated for drought
tolerance at reproductive stage under rain out shelter.
Background selection of BILs showed highest recovery
(90%) of recipient genome in the BIL harboring three major
QTLs from Apo a tolerant donor. Significant differences
were observed among the BILs and parents for grain yield
and its contributing traits under both severe moisture stress
and well irrigated conditions when compared to ADT 45.
The BIL harboring three major QTLs, DTY (2.2+3.1+8.1)
[QTLs for yield under stress on chromosome 2,3 and 8]
performed better and showed increased values for grain
yield, plot yield, spikelet fertility and harvest index than the
BIL harboring 2 major QTLs DTY (3.1+8.1), which shows
pyramiding of more number of QTLs may enhance the
grain yield under stress. Both the BILs harboring two and
three major QTLs recorded lesser Drought Susceptible
Index under severe moisture stress.

Keywords: Drought resistance, yield under stress, QTLs, marker assisted selection


Year: 2014
Volume: 74
Issue: 3
Article DOI: 10.5958/0975-6906.2014.00856.6
Print ISSN: 0019-5200
Online ISSN: 0975-6906


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