Mondal, S. and Singh, R.P. and Mason, E.R. and Huerta-Espinoa,, J. and etl, . (2016) Grain yield, adaptation and progress in breeding for early-maturing and heat-tolerant wheat lines in South Asia. Field Crops Research, 192. pp. 78-85.
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Abstract
Maintaining wheat productivity under the increasing temperatures in South Asia is a challenge. Wefocused on developing early maturing wheat lines as an adaptive mechanism in regions suffering fromterminal heat stress and those areas that require wheat adapted to shorter cycles under continualhigh temperature stress. We evaluated the grain yield performance of early-maturing heat-tolerantgermplasm developed by CIMMYT, Mexico at diverse locations in South Asia from 2009 to 2014 andestimated the breeding progress for high-yielding and early-maturing heat-tolerant germplasm in SouthAsia. Each year the trial comprised of 28 new entries, one CIMMYT check (Baj) and a local check vari-ety. Locations were classified by mega environment (ME); ME1 being the temperate irrigated locationswith 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 onGY was observed in both ME1 and ME5. Across years, mean minimum temperatures in ME1 and meanmaximum temperatures in ME5 during grain filling had significant negative association with GY. TheME1 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 correla-tions 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 trendwas observed while estimating the breeding progress across five years for high-yielding early-maturingheat tolerant wheat compared to the local checks in South Asia. The results suggests the potential ofthe high-yielding early-maturing wheat lines developed at CIMMYT in improving wheat production andmaintaining genetic gains in South Asia.
| Item Type: | Article |
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| Uncontrolled Keywords: | Early maturity, Wheat, Heat tolerance, South Asia |
| Author Affiliation: | International Maize and Wheat Improvement Center (CIMMYT), Int. Apdo. Postal 6-641, 06600 Mexico, DF, Mexico |
| Subjects: | Plant Production Crop Improvement |
| Divisions: | Other Crops |
| Depositing User: | Mr T L Gautham |
| Date Deposited: | 28 Aug 2018 07:50 |
| Last Modified: | 28 Aug 2018 07:50 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/15572 |
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