Journal
ACTA PHYSIOLOGIAE PLANTARUM
Volume 38, Issue 4, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11738-016-2119-5
Keywords
Nitrogen-deficiency tolerance; Root system architecture; Deeper root; Quantitative trait locus; Underground revolution
Categories
Funding
- Univ. of Tokyo, Japan Public-Private Partnership Student Study Abroad Program
- TOBITATE! Young Ambassador Program
- Ministry of Foreign Affairs of Japan (MOFA)
- Grants-in-Aid for Scientific Research [15J02762] Funding Source: KAKEN
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [1026555] Funding Source: National Science Foundation
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Improved root system architecture can enhance agronomic performance by increasing water and nitrogen (N) acquisition efficiency. However, little is known about interaction between root system architecture and agronomic performance under field environments. To gain a better understanding about the genetic basis of these relationships, we evaluated a set of chromosome segment substitution lines (CSSLs) derived from crosses between a tropical japonica rice cultivar 'Curinga' and a wild species Oryza rufipogon accession IRGC105491. Root system architectural traits were investigated using the CSSLs at 40 days old seedlings using the root basket method under hydroponic conditions, and agronomic performances were also tested under field conditions with different N treatments. Agronomic performances were computed as the ratio of a trait value under low to high N treatments, including grain yield and biomass yield as nitrogen-deficiency tolerance (NDT) traits. Root architecture and NDT trait QTLs were mapped using 238 SNP marker loci. A total of 13 QTLs for root system architectural, NDT and morpho-physiological traits were identified on chromosomes 1, 3, 4, 5, 7, 8, 9, 10 and 12. Interestingly, a QTL for deeper root number was identified the region of SNP markers between id1012330 and id1021697 on chromosome 1 under hydroponic conditions overlapped with a QTL for NDT trait of relative grain yield (qRGY1). These results suggest that deeper root trait is helpful to maintain grain yield under nitrogen-deficient conditions. The QTL associated root architecture could potentially be used in future rice-breeding efforts to increase agronomic performance under nitrogen-deficient conditions.
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