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Marker Assisted Breeding to Develop Multiple Stress Tolerant Varieties for Flood and Drought Prone Areas
- Sandhu, Nitika, Dixit, Shalabh, Swamy, B. P. M., Raman, Anitha, Kumar, Santosh, Singh, S. P., Yadaw, R. B., Singh, O. N., Reddy, J. N., Anandan, A., Yadav, Shailesh, Venkataeshwarllu, Challa, Henry, Amelia, Verulkar, Satish, Mandal, N. P., Ram, T., Badri, Jyothi, Vikram, Prashant, Kumar, Arvind
- Rice 2019 v.12 no.1 pp. 8
- climate, drought, farmers, flooding tolerance, grain yield, introgression, isogenic lines, marker-assisted selection, quantitative trait loci, rice, single nucleotide polymorphism, submergence, water stress, India, Nepal
- BACKGROUND: Climate extremes such as drought and flood have become major constraints to the sustainable rice crop productivity in rainfed environments. Availability of suitable climate-resilient varieties could help farmers to reduce the grain yield losses resulting from the climatic extremities. The present study was undertaken with an aim to develop high-yielding drought and submergence tolerant rice varieties using marker assisted introgression of qDTY₁.₁, qDTY₂.₁, qDTY₃.₁ and Sub1. Performance of near isogenic lines (NILs) developed in the background of Swarna was evaluated across 60 multi-locations trials (MLTs). The selected promising lines from MLTs were nominated and evaluated in national trials across 18 locations in India and 6 locations in Nepal. RESULTS: Grain yield advantage of the NILs with qDTY₁.₁ + qDTY₂.₁ + qDTY₃.₁ + Sub1 and qDTY₂.₁ + qDTY₃.₁ + Sub1 ranged from 76 to 2479 kg ha⁻ ¹ and 396 to 2376 kg ha⁻ ¹ under non-stress (NS) respectively and 292 to 1118 kg ha⁻ ¹ and 284 to 2086 kg ha⁻ ¹ under reproductive drought stress (RS), respectively. The NIL, IR96322–34-223-B-1-1-1-1 having qDTY₁.₁ + qDTY₂.₁ + qDTY₃.₁ + Sub1 has been released as variety CR dhan 801 in India. IR 96321–1447-651-B-1-1-2 having qDTY₁.₁ + qDTY₃.₁ + Sub 1 and IR 94391–131–358-19-B-1-1-1 having qDTY₃.₁ + Sub1 have been released as varieties Bahuguni dhan-1′ and ‘Bahuguni dhan-2’ respectively in Nepal. Background recovery of 94%, 93% and 98% was observed for IR 96322–34-223-B-1-1-1-1, IR 96321–1447-651-B-1-1-2 and IR 94391–131–358-19-B-1-1-1 respectively on 6 K SNP Infinium chip. CONCLUSION: The drought and submergence tolerant rice varieties with pyramided multiple QTLs can ensure 0.2 to 1.7 t ha⁻ ¹ under reproductive stage drought stress and 0.1 to 1.0 t ha⁻ ¹ under submergence conditions with no yield penalty under non-stress to farmers irrespective of occurrence of drought and/or flood in the same or different seasons.