Figure 4. Principal component analysis of performance and stress-adaptive traits for 23 wheat genetic resource lines grown under drought (uppercase) and hot, irrigated conditions (lowercase), northwest Mexico, 2003 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; CTV/CTG, canopy temperature during vegetative and grainfilling stages; HI, harvest index; NDVI, normalized difference vegetative index (used to estimate relative biomass before heading); YLD, yield.