Abstract
Developing trait introgressed rice cultivars is essential to sustain yield under aerobic conditions. Here, we report DNA markers governing variability in root traits, water use efficiency (WUE) and other biometric traits like total leaf area by association mapping. A set of 173 diverse rice germplasm accessions were phenotyped for root traits in specially designed root structures and WUE using carbon isotope discrimination (Δ13C) during the monsoon season (July to October) of two consecutive years (2007 and 2008). The panel was genotyped using 291 SSR markers spanning the entire genome of rice. Root biomass varied between 1.8 and 16.3 g plant−1 while root length between 22 and 78 cm representing significant genetic variability. Similarly, Δ13C varied from 18 to 23 ‰. The SSR markers showed extensive polymorphism with around 73 % of all the markers revealing polymorphism information content values more than 0.5. Model-based structure analysis using the squared-allele frequency correlations revealed six subgroups among the panel with an average LD decay of about 10–20 cM. The Benjamini–Hochberg analysis was carried out to compute the false discovery rate combined with the analysis of effective LD. A total of 82 markers were involved in 175 significant (corrected P values and Q values <0.05) marker–trait associations (MTAs) across experiment 1 and experiment 2 and for the pooled data. Out of these, 22 markers were found to be associated with more than one trait. Common markers with significant associations were discovered for root biomass, total leaf area and total biomass suggesting the interdependency of these traits. Finally, 12 markers showed significant and stable MTAs across the experiments for different traits. An in silico analysis indicated that 45 % of the MTAs overlapped with previously reported QTLs and can be used for QTL introgression through breeding.
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Acknowledgments
Authors acknowledge the financial help from DBT program support (BT/01/COE/05/03) and Niche Area of Excellence Program of ICAR (F.No. 10-(6)/2005 EP&D). We also thank the DBT-HUB program that supported the fellowship to Raju BR. The authors gratefully acknowledge the Central Rice Research Institute (CRRI), Cuttack, Odisha, India, for kindly sharing seeds of germplasm accessions. The help rendered by Dr. Padmini Swain, Principal Scientist, Plant Physiology, CRRI, in identifying the germplasm accessions is acknowledged. Authors thank all the phenotyping team in UAS (Bangalore) and ZARS Mandya for their support. Special thanks to Mr. Lalith Kishor, GE Healthcare for his technical support during genotyping. The authors acknowledge the two anonymous referees whose comments significantly improved the overall effectiveness of the manuscript.
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Raju, B.R., Mohankumar, M.V., Sumanth, K.K. et al. Discovery of QTLs for water mining and water use efficiency traits in rice under water-limited condition through association mapping. Mol Breeding 36, 35 (2016). https://doi.org/10.1007/s11032-016-0457-z
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DOI: https://doi.org/10.1007/s11032-016-0457-z