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Results are presented of field experiments conducted in 2001 and 2003 in Morocco to assess the genetic diversity within a collection of local populations of faba bean for tolerance of water stress and to develop indices for identifying tolerant genotypes. The plant material comprised 90 diverse local faba bean populations belonging to 10 local cultivars (9 populations per cultivar). For the 10 cultivars, water deficit started at 2 months after plant emergence (first water content (WC) measurement) which coincided with the beginning of the flowering of the early cultivars. All the genotypes expressed a reduction of WC under stress at all 3 stages. Differences among local cultivars for WC reduction were not significant at 2 months after sampling. However at months 3 and 4 (measurements 2 and 3), these differences were highly significant. Analysis of variance revealed that differences for plant biomass, grain yield and yield components were highly significant among the local cultivars and between the 2 water regimes (dry and irrigation treatments). The interaction local cultivar × water regime was also highly significant, indicating that the ranking of the genotypes varies under the 2 water treatments. The local cultivars were significantly different for grain yield reduction under water deficit. The effect of irrigation was independent of the production level. The value of drought intensity index of 0.42 indicates that water stress was severe, reducing grain yield by 42% on average. All measurements of traits associated with faba bean growth and yield and derived parameters to assess the productivity potential allowed effective classification of the 10 local cultivars. The drought tolerance indices allowed to synthesize these parameters and rank the plant material.
analysis of variance, crop yield, drought resistance, fababeans, genetic diversity, genotypes, growth, irrigation, landraces,water content, water stress, yield components, yield losses, Morocco,Vicia faba, Maghreb, North Africa, Africa, Mediterranean Region,Developing Countries, Francophone Africa, Vicia, Papilionoideae,Fabaceae, Fabales, dicotyledons, angiosperms, Spermatophyta, plants,eukaryotes, broad beans, drought tolerance, fava beans, field beans,horse beans, tic beans, variance analysis, watering, Field Crops (FF005)(New March 2000), Plant Breeding and Genetics (FF020), Plant WaterRelations (FF062), Plant Production (FF100), Environmental Tolerance ofPlants (FF900), Soil Water Management (Irrigation and Drainage) (JJ800)(Revised June 2002) [formerly Soil Water Management]