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

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.

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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.

Item Type: Article
Uncontrolled Keywords: doubled haploid population; nitrogen acquisition; quantitative trait loci; quantitative trait loci × environment interaction; rice
Agro Tags: <b>Agrotags</b> - nitrogen | planting | rice | enzymes | inorganic acid salts | grain | environment | genes | social groups | genetics <br><b>Fishtags</b> - drying <br><b>Geopoliticaltags</b> - principe | india | tamil nadu | maine | usa | philippines | atmosphere | oriente
Subjects: Others > Genetics and Genomics
Depositing User: Library ICRISAT
Date Deposited: 12 Aug 2011 11:17
Last Modified: 31 Jan 2012 07:43
URI: http://oar.icrisat.org/id/eprint/180
Official URL: http://dx.doi.org/10.1111/j.1744-7909.2008.00713.x
Acknowledgement: UNSPECIFIED
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