Modeling Biomass Allocation and Grain Yield in Bread and Durum Wheat under Abiotic Stress

摘要: Differences between two wheat genotypes [ Triticum aestivum and T. durum species (A D, respectively)] in dry matter (DM) partitioning into stems, leaves spikes, response to multiple abiotic stresses were quantified during years of contrasting rainfall regimes. The impact normal (N, ~1830 accumulated growing degree days, GDD), late (L, ~1750 GDD) planting, combination with (450 live seed m -2 ) or large (25% above normal) population density on 1000-kernel weight (TKWT), kernels (K ), grain yield (GY, Mg ha -1 was quantified. Years, species, stress treatments, their interactions explained 67, 73, 75% total variance DM partitioned stem (R-Stem), (R-Leaves), spike (R-Spike), respectively, 15 days after anthesis; 50, 78 51% , TKWT GY, at physiological maturity. sets variables positively correlated (canonical r=0.90; p<0.0001); however, simple correlation coefficients individual both shifted magnitude significance treatments. Partial least squares regression models developed for each quantify its stress.