Indian Society of Genetics & Plant Breeding

Breeding rice for nitrogen use efficiency

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Development of nitrogen use efficient (NUE) rice varieties
is inevitable for sustainability of environmental friendly and
economical agricultural practices. Several management
practices are being studied for increasing efficiency of
spatial and temporal inputs of N under National Innovations
for Climate Resilient Agriculture (NICRA). Attempts are
being made to develop NUE rice varieties with
multidisciplinary approach and conventional selection
along with mapping and next generation sequencing
strategies. Around 800 rice genotypes were characterized
under low and recommended nitrogen for two consecutive
seasons and the promising donors further evaluated to
identify consistent NUE rice genotypes. Several mapping
populations were developed using the NUE donors and
popular rice varieties. QTL/genomic regions were identified
for yield under low N using biparental and association
mapping. Using minimum marker set of 50 rice SSR markers,
12 genomic regions were identified for yield and yield
associated traits under low nitrogen. Several promising
recombinants of yield and NUE were identified and these
breeding lines were evaluated under multi-locations and
stable performers were identified under AICRIP Trial -
Evaluation of Radiation and Nitrogen use efficient
promising rice genotypes -Plant Physiology during Kharif
2016, 2017 and 2018. As nitrogen is the building block of
biomass, an optimum N is required for realizing the yield.
The strategy should be to maximise uptake and improve
utilization, so that remobilization of N to yield is achieved
under low N.

Keywords: Rice, low nitrogen, donors, genomic regions, breeding


Year: 2019
Volume: 79
Issue: 1, Supplement
Article DOI: 10.31742/IJGPB.79S.1.11
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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