000032341 001__ 32341
000032341 041__ $$aEnglish
000032341 100__ $$aMondal, S.
000032341 245__ $$aGrain Yield, Adaptation and Progress in Breeding for Early-Maturing and Heat-Tolerant Wheat Lines in South Asia
000032341 260__ $$c2016
000032341 300__ $$a78-85
000032341 520__ $$aMaintaining wheat productivity under the increasing temperatures in South Asia is a challenge. We focused on developing early maturing wheat lines as an adaptive mechanism in regions suffering from terminal heat stress and those areas that require wheat adapted to shorter cycles under continual high temperature stress. We evaluated the grain yield performance of early-maturing heat-tolerant germplasm developed by CIMMYT, Mexico at diverse locations in South Asia from 2009 to 2014 and estimated the breeding progress for high-yielding and early-maturing heat-tolerant germplasm in South Asia. Each year the trial comprised of 28 new entries, one CIMMYT check (Baj) and a local check variety. Locations were classified by mega environment (ME); ME1 being the temperate irrigated locations with terminal high temperature stress, and ME5 as hot, sub-tropical, irrigated locations. Grain yield (GY), days to heading (DTH) and plant height (PH) were recorded at each location. Effect of temperature on GY was observed in both ME1 and ME5. Across years, mean minimum temperatures in ME1 and mean maximum temperatures in ME5 during grain filling had significant negative association with GY. The ME1 locations were cooler that those in ME5 in the 5 years of evaluations and had a 1–2 t/ha higher GY. A mean reduction of 20 days for DTH and 20 cm in PH was observed in ME5. Negative genetic correlations of -0.43 to -0.79 were observed between GY and DTH in South Asia during 2009–2014. Each year, we identified early-maturing germplasm with higher grain yield than the local checks. A positive trend was observed while estimating the breeding progress across five years for high-yielding early-maturing heat tolerant wheat compared to the local checks in South Asia. The results suggests the potential of the high-yielding early-maturing wheat lines developed at CIMMYT in improving wheat production and maintaining genetic gains in South Asia.
000032341 653__ $$aEarly Maturity
000032341 653__ $$aWheat
000032341 653__ $$aHeat Tolerance
000032341 653__ $$aSouth Asia
000032341 700__ $$aSingh, R. P.
000032341 700__ $$aMason, E. R.
000032341 700__ $$aHuerta-Espino, J.
000032341 700__ $$aAutrique, E.
000032341 700__ $$aJoshi, A. K.
000032341 773__ $$pField Crops Research
000032341 773__ $$v192 
000032341 773__ $$ahttp://dx.doi.org/10.1016/j.fcr.2016.04.017
000032341 8564_ $$uhttp://www.sciencedirect.com/science/article/pii/S0378429016301010$$yExternal link (open access)
000032341 980__ $$aARTICLE