Identifying physiological traits to optimize assimilate partitioning and spike fertility for yield potential in wheat (Triticum aestivum L.) genotypes
Rivera-Amado, Alma Carolina (2016) Identifying physiological traits to optimize assimilate partitioning and spike fertility for yield potential in wheat (Triticum aestivum L.) genotypes. PhD thesis, University of Nottingham.
Although wheat demand is expected to increase along with a projected growing population, the global rate of wheat yield increase appears to be declining. Genetic progress in yield potential in the past has been achieved mainly through increases in grains m-2 and harvest index with no major changes in above-ground biomass; however, HI has not increased since about 1990 indicating that further increases in yield potential will rely on increases in biomass while optimizing grain DM partitioning. A panel of 26 high biomass CIMMYT elite spring wheat cultivars (CIMMYT Mexico Core Germplasm; CIMCOG) was evaluated for grain yield, above-ground dry-matter (AGDM), DM partitioning and spike fertility in three field experiments (2011, 2012 and 2013) in NW Mexico. An additional field experiment was carried out in 2014 on a subset of four cultivars to examine source-sink related traits by imposing source manipulation treatments (leaf-lamina removal and leaf-sheath shading) on the crop. The main objective was to identify the physiological determinants of grains m-2 and HI in relation to DM partitioning among organs and to prioritise traits for application in breeding to increase HI in high biomass genotypes.
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