Indian Society of Genetics & Plant Breeding

Evaluation of drought tolerance in backcross inbred lines of rice genotypes based on selection indices

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Drought tolerant lines of Improved White Ponni (IWP) were
developed by marker assisted back crossing of IWP with
Apo. Three drought tolerant backcross inbred lines (BILs),
developed by introgressing the drought tolerance QTLs
from Apo were evaluated for drought tolerance along with
their parents based on drought indices. Twenty drought
indices were calculated based on grain yield under drought
and irrigated conditions. Yield in drought and irrigated
conditions were significantly and positively correlated with
mean productivity index, harmonic mean, geometric mean
of productivity and stress tolerance index. Ranking method
and three dimensional plot discriminated IWP-4-2 as the
most drought tolerant genotype, which was placed in group
A (Genotypes, which performed good under drought and
irrigated conditions), and outperformed the drought
tolerant parent, Apo. IWP-4-2 possessed medium slender
grains similar to the recurrent parent, IWP. Based on its
drought tolerance and grain type IWP-4-2 can also be used
as donor parent for developing climate resilient rice variety
suitable to conditions obtaining in Tamil Nadu.

Keywords: Rice, drought indices, ranking method, correlation analysis, grain type


Year: 2016
Volume: 76
Issue: 3
Article DOI: 10.5958/0975-6906.2016.00044.4
Print ISSN: 0019-5200
Online ISSN: 0975-6906


A. Kalamani info_circle
M. Raveendran info_circle
S. Robin info_circle

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