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QTL and QTL × Environment Effects on Agronomic and Nitrogen Acquisition Traits in Rice

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Relation http://oar.icrisat.org/180/
http://dx.doi.org/10.1111/j.1744-7909.2008.00713.x
 
Title QTL and QTL × Environment Effects on Agronomic and Nitrogen Acquisition Traits in Rice
 
Creator Senthilvel, S
Vinod, K K
Malarvizhi, P
Maheswaran, M
 
Subject Genetics and Genomics
 
Description Agricultural environments deteriorate due to excess nitrogen application. Breeding for low nitrogen responsive genotypes
can reduce soil nitrogen input. Rice genotypes respond variably to soil available nitrogen. The present study attempted
quantification of genotype × nitrogen level interaction and mapping of quantitative trait loci (QTLs) associated with
nitrogen use efficiency (NUE) and other associated agronomic traits. Twelve parameters were observed across a set of
82 double haploid (DH) lines derived from IR64/Azucena. Three nitrogen regimes namely, native (0 kg/ha; no nitrogen
applied), optimum (100 kg/ha) and high (200 kg/ha) replicated thrice were the environments. The parents and DH
lines were significantly varying for all traits under different nitrogen regimes. All traits except plant height recorded
significant genotype×environment interaction. Individual plant yield was positively correlated with nitrogen use efficiency
and nitrogen uptake. Sixteen QTLs were detected by composite interval mapping. Eleven QTLs showed significant
QTL×environment interactions. On chromosome 3, seven QTLs were detected associated with nitrogen use, plant yield
and associated traits. A QTL region between markers RZ678, RZ574 and RZ284 was associated with nitrogen use and yield.
This chromosomal region was enriched with expressed gene sequences of known key nitrogen assimilation genes.
 
Publisher Wiley-Blackwell
 
Date 2008
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/180/1/jouint.pdf
Senthilvel, S and Vinod, K K and Malarvizhi, P and Maheswaran, M (2008) QTL and QTL × Environment Effects on Agronomic and Nitrogen Acquisition Traits in Rice. Journal of Integrative Plant Biology, 50 (9). pp. 1108-1117.