Indian Society of Genetics & Plant Breeding


Physiological and molecular basis of water-deficit stress tolerance in F1 hybrids and their parental lines in rice

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Rice hybrids are known to withstand moisture deficit stress
better than their parental purelines. To study the effect of
water deficit stress in rice hybrids, in terms of productivity
related traits and physiological parameters pertaining to
drought stress, 22 rice hybrids and their parental lines
were evaluated under well irrigated and water deficit
conditions. Sixteen F1 hybrids showed positive heterosis
over their respective mid-parental means for yield and
spikelet fertility. Pusa 6A and Vandana was the best cross
combination for developing high yielding hybrid rice
varieties under drought since they had the highest positive
standard heterosis and heterobeltiosis for grain yield,
spikelet fertility and membrane stability index (MSI). Among
the physiological parameters, MSI was found to reflect the
drought tolerance ability of a genotype (pureline/hybrid)
better. A set of 60 genome-wide SSR markers were used for
prediction of heterotic potential of genotypes under well
irrigated and water deficit conditions which revealed that
genetic distances and spikelet fertility had a positive and
significant correlation.

Keywords: Grain yield, heterosis, membrane stability index, rice, water deficit


Year: 2016
Volume: 76
Issue: 2
Article DOI: 10.5958/0975-6906.2016.00035.3
Print ISSN: 0019-5200
Online ISSN: 0975-6906


Vinod Kumar info_circle
Kapil K. Tiwari info_circle
Chandra Prakash info_circle
Ashutosh Singh info_circle
Ashok K. Singh info_circle
Niranjan Behera info_circle
Jogeswar Panigrahi info_circle
S. V. Amitha Mithra info_circle
Trilochan Mohapatra info_circle

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