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Figure 2. Principal component analysis of performance and drought adaptive traits associated with harvest index (.....), water capture (- - -), and water use efficiency (—) for 24 wheat genetic resource lines grown under drought, northwest Mexico, 2004 to 2006. ANT, days to anthesis from emergence; BM, dry aboveground biomass at maturity; BMA, biomass shortly after anthesis; CHL, flag leaf chlorophyll shortly after anthesis; CHO, soluble carbohydrate content of stems shortly after anthesis; CID, carbon isotope discrimination of well-watered leaves; CTV/CTG, canopy temperature during vegetative and grainfilling stages; HI, harvest index; NDVI, normalized difference vegetative index (used to estimate relative biomass before heading); RARSc, ratio analysis of reflectance spectra to estimate carotenoid pigments in the canopy; WU, apparent water use based on gravimetric soil measurement; WUE, water use efficiency; YLD, yield.
