Effect of Recurrent Selection on Drought Tolerance and Related Morpho-Physiological Traits in Bread WheatReport as inadecuate




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Drought is one of the major abiotic stresses affecting wheat yield. A recurrent selection program was conducted to improve the drought tolerance and yield of bread wheat using drought tolerant advanced breeding lines from a drought tolerant x susceptible cross HI 1500 x HUW 510. The parental lines were evaluated for yield, biomass and harvest index HI in addition to the drought adaptive traits like Canopy Temperature CT, chlorophyll content and Normalized Difference Vegetative Index NDVI. After three rounds of recurrent selection, the half sib progenies exhibited a marked reduction in CT, chlorophyll content and biomass; whereas improvement was noted for yield, HI and NDVI. Drought tolerance of the half-sib population appeared enhanced as indicated by drought indices and grain yield. Compared to base population, half-sibs showed better HI, grain filling and a significant 17.1% increase in grain yield under water stress conditions. Cooler canopies and increased early vigour might have contributed to drought tolerance. A favourable combination of gibberellin sensitive and insensitive Rhtalleles was observed in the recombinant progenies. However, increased yield under water stress had a negative trade off in reduction of biomass. The study also identified potential lines with high yield and drought tolerance for subsequent varietal development for water limited areas.



Author: Ramya P , Gyanendra Pratap Singh, Neelu Jain, Pradeep Kumar Singh, Manoj Kumar Pandey, Kavita Sharma, Arun Kumar, Harikrishna, Ku

Source: http://plos.srce.hr/



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