MOLECULAR MARKER ANALYSIS OF WHOLE-PLANT ARCHITECTURE OF RICE (Oryza sativa L.) UNDER AEROBIC CONDITION
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Date
2018-09-05
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University of Agricultural Sciences, Bengaluru
Abstract
Declining water resources for rice cultivation has encouraged research on the
development of water efficient aerobic rice varieties by combining the high-yielding traits of
lowland varieties with the drought-resistant characteristics of upland varieties. Grain yield is
one single trait that could be considered as a manifestation of drought resistance. The wholeplant
architecture of aerobic rice was studied by considering both shoot and root traits in
order to determine an efficient selection criteria for improving grain yield under drought
condition. In this study, ten genotypes which were highly contrasting in phenotypic
characters were grown in field as well as in PVC pipes. Field evaluation of the different
genotypes for root morphological traits, yield and yield attributed traits under aerobic
condition revealed significant differences among the genotypes for all traits. GCV, PCV, h2
and genetic advance were high in genotypes for all the traits recorded. Highest value for root
length was 70.16 cm (Moroberekan). Grain yield showed significant positive correlation with
plant height, panicle length, shoot biomass, shoot growth rate by length, total plant length,
root length and root number. Molecular marker analysis was done using 45 SSR markers. Out
of 45 SSR primers, 15 of them were found to be polymorphic while rest were monomorphic.
These markers generated unique alleles of various sizes in different genotypes which can be a
source of new alleles. The study reveals that adequate diversity still exists in the cultivar
genepool for steady varietal improvement.
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