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Identification of rice landraces with promising yield and the associated genomic regions under low nitrogen

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Title Identification of rice landraces with promising yield and the associated genomic regions under low nitrogen
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Creator I. Subhakara Rao, C. N. Neeraja, B. Srikanth, D. Subrahmanyam, K. N. Swamy, K. Rajesh, P. Vijayalakshmi, T. Vishnu Kiran, N. Sailaja, P. Revathi, P. Raghuveer Rao, L. V. Subba Rao, K. Surekha, V. Ravindra Babu and S. R. Voleti
 
Subject Rice, landraces, association mapping, yield, low nitrogen, candidate genes
 
Description Not Available
With the priority of the low input sustainable rice cultivation for environment friendly agriculture, NUE
of rice becomes the need of the hour. A set of 472 rice genotypes comprising landraces and breeding
lines were evaluated for two seasons under field conditions with low and recommended nitrogen and
>100 landraces were identified with relative higher yield under low nitrogen. Donors were identified for
higher N uptake, N translocation into grains and grain yield under low N. Grains on secondary branches,
N content in grain and yield appears to be the selection criterion under low N. Through 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. Four associated genomic regions on chromosomes
5, 7 and 10 were fine mapped and QTL for yield under low N were identified from the marker delimited
regions. Three candidate genes viz., 2-oxoglutarate /malate translocator (Os05g0208000), alanine
aminotransferase (Os07g0617800) and pyridoxal phosphate-dependent transferase (Os10g0189600)
from QTL regions showed enhanced expression in the genotypes with promising yield under low N.
Marker assisted selection using SSR markers associated with three candidate genes identified two
stable breeding lines confirmed through multi-location evaluation
NICRA
 
Date 2021-08-16T08:30:22Z
2021-08-16T08:30:22Z
2018-06-15
 
Type Research Paper
 
Identifier Rao, I.S., Neeraja, C.N., Srikanth, B. et al. Identification of rice landraces with promising yield and the associated genomic regions under low nitrogen. Sci Rep 8, 9200 (2018). https://doi.org/10.1038/s41598-018-27484-0
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http://krishi.icar.gov.in/jspui/handle/123456789/57235
 
Language English
 
Relation Not Available;
 
Publisher Nature