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Spectral Reflectance to Estimate Genetic Variation for In-Season Biomass, Leaf Chlorophyll, and Canopy Temperature in Wheat

^a Department of Plant and Soil Sciences, 368 Ag. Hall, Oklahoma State University, Stillwater, OK 74078, USA
^b International Maize and Wheat Improvement Center (CIMMYT), Km. 45, Carretera Mexico, El Batan, Texcoco, Mexico
^c Department of Primary Industries (DPI), Private Bag 260, Horsham, Victoria, Postcode: 3401, DX Number: 216515, Australia
^d Department of Biosystems and Agricultural Engineering, Oklahoma State University, Stillwater, OK 74078, USA

View larger version (22K): [in a new window]   Fig. 1. The changes in values of normalized difference vegetation index (NDVI), water index (WI), and simple ratio (SR) with an increase in biomass and with the advancement of growth stages in experiment GHIST in year 2003–2004. Boot, Hd, and GF indicate the biomass and spectral indices were measured at booting, heading, and grainfilling.

View larger version (17K): [in a new window]   Fig. 2. The trends of changes in pigment specific simple ratio-chlorophyll-a (PSSRa), ratio analysis of reflectance spectra-chlorophyll-b (RARSb), and ratio analysis of reflectance spectra-carotenoids (RARSc) with the changes of values of SPAD in three different growth stages. Boot, Hd, and GF indicate the measurements were taken at booting, heading, and grainfilling.

View larger version (30K): [in a new window]   Fig. 3. The relationship between biomass and normalized difference vegetation index (NDVI), simple ratio (SR), and normalized water index-2 (NWI-2) in three different experiments, with the correlation coefficients calculated from the averages over 2 yr for biomass and spectral reflectance indices. ** Significant at P = 0.01.

View larger version (18K): [in a new window]   Fig. 4. Relationship between chlorophyll content (SPAD values) and pigment specific simple ratio-chlorophyll a (PSSRa), ratio analysis of reflectance spectra-chlorophyll b (RARSb), and ratio analysis of reflectance spectra-carotenoids (RARSc) across 3 yr in experiment GHIST at grainfilling stage. ** Significant at P = 0.01.