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Genetic Analysis of Indirect Selection for Winter Wheat Grain Yield Using Spectral Reflectance Indices

^a Dep. of Plant and Soil Sciences, 368 Ag Hall, Oklahoma State Univ., Stillwater, OK 74078, USA
^b Dep. of Biosystems and Agricultural Engineering, Oklahoma State Univ., Stillwater, OK 74078, USA
^c Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506, USA. This research was partially funded by Oklahoma Agricultural Experiment Station, Oklahoma Wheat Commission, and Oklahoma Wheat Research Foundation

View larger version (20K): [in this window] [in a new window]   Figure 1. Linear relationship between grain yield and normalized water index 3 (NWI-3) at three growth stages and averaged over growth stages for Population 1. ** Significant at the 0.01 probability level.

View larger version (21K): [in this window] [in a new window]   Figure 2. Two-dimensional distributions of coefficients of the first two principal components (PC) obtained by a multivariate analysis of different spectral reflectance indices and grain yield for three experiments. RNDVI, red normalized difference vegetation index; GNDVI, green normalized difference vegetation index; SR, simple ratio; WI, water index; NWI-1, normalized water index 1; NWI-2, normalized water index 2; NWI-3, normalized water index 3; NWI-4, normalized water index 4; YLD, yield.