1. Agbicodo EM, Fatokun CA, Muranaka S et al (2009) Breeding drought tolerant cowpea: constraints, accomplishments, and future prospects. Euphytica 167:353–370
2. Alza JO, Fernandezmartinez JM (1997) Genetic analysis of yield and related traits in sunflower (Helianthus annuus l.) in dryland and irrigated environments. Euphytica 95:243–251
3. Aparicio N, Villegas D, Casadesus J et al (2000) Spectral vegetation indices as nondestructive tools for determining durum wheat yield. Agron J 92:83–91
4. Araus JL, Casadesus J, Bort J (2001) Recent tools for the screening of physiological traits determining yield. In: Reynolds MP, Ortiz-Monasterio JI, McNab A (eds) Application of physiology in wheat breeding. CIMMYT, Mexico
5. Ashton T (1948) Techniques of breeding for drought resistance in crops. Commonwealth Bureau of Plant Breeding and Genetics, Cambridge