Development of white common beans for the processing industry in East Africa: Adaptability, resistance to selected diseases, cooking time and canning quality

Common bean ( Phaseolus vulgaris L.) provides dietary protein, energy, fiber, and micronutrients, especially iron and zinc to over 800 million people in Africa and Latin America. The crop has various seed types. White beans are very popular for the processing industry. This study aimed to investigate the agronomic performance, canning quality, cooking time (COOKT) and response to root rots ( Fusarium cuneirostrum and Pythium ultimum ) and angular leaf spot (ALS; Pseudocercospora griseola ) diseases among 151 drought tolerant small and large seeded white bean genotypes from trials conducted between 2013 to 2018 in East Africa. Significant (P<0.001) differences existed among the genotypes for response to the three pathogens, COOKT and canning quality traits. Resistance to each of the pathogens was expressed in 24-75% of the genotypes, while dual resistance to any two pairs of the pathogens occurred in 10-44% of the genotypes. Four genotypes; ICNBunsixSxB405/4C-1C-1C-88, RAZ-11, ETSNAP18 and ETSNAP3 expressed resistance to the three pathogens but had COOKT of 46-56 minutes (based on a Matson cooker), and below average canning quality. They are recommended as sources of diseases resistance but could be further improved for COOKT and canning quality. Sixty-eight genotypes had COOKT <50 minutes while 24 expressed good to excellent visual canning quality. Some phenotypes: RAZ-120, RAZ36-Caballero, NavyLine-60, NavyLine-25, ZABR16573-25F22, ZABR16575-60F22, ETSNAP33, Bifortsmallseeded-15 and ZABR16574-37F22, that were cooked in <45 minutes, exhibited good to excellent canning quality and expressed resistant to intermediate diseases resistance responses. These may be used as parental lines and/or fast tracked for variety release through regional trials.Le haricot commun ( Phaseolus vulgaris L.) fournit des prot\ue9ines alimentaires, de l\u2019\ue9nergie, des fibres et des micronutriments, en particulier du fer et du zinc \ue0 plus de 800 millions de personnes en Afrique et en Am\ue9rique latine. La culture a divers types des graines, mais les haricots blancs sont tr\ue8s populaires dans l\u2019industrie de la transformation. Cette \ue9tude visait \ue0 \ue9tudier la qualit\ue9 agronomique et de mise en conserve, le temps de cuisson et la r\ue9ponse des haricots blancs aux pourritures des racines et \ue0 la tache angulaire (ALS, angular leaf spot) qui provoquent des pertes de rendement importantes dans la production des haricots en Afrique de l\u2019Est. Les haricots \ue0 petites et grandes graines am\ue9lior\ue9s pour la tol\ue9rance \ue0 la s\ue9cheresse ont \ue9t\ue9 \ue9valu\ue9s de 2013 \ue0 2018. Des diff\ue9rences significatives (P<0,001) existaient entre les 151 g\ue9notypes pour la r\ue9ponse \ue0 trois agents pathog\ue8nes ( Fusarium cuneirostrum , Pythium ultimum and Pseudocercospora griseola ), le temps de cuisson et les caract\ue9ristiques de qualit\ue9 de mise en conserve. Il \ue9tait possible de s\ue9lectionner une r\ue9sistance \ue0 la maladie simple, double et triple. La r\ue9sistance \ue0 chacun des agents pathog\ue8nes a \ue9t\ue9 exprim\ue9e dans 24 \ue0 75 % des g\ue9notypes ; tandis qu\u2019une double r\ue9sistance \ue0 deux paires des agents pathog\ue8nes s\u2019est produite dans 10 \ue0 44 % des g\ue9notypes. Les quatre g\ue9notypes ; ICNBunsixSxB405/4C-1C-1C-88, RAZ-11, ETSNAP18 et ETSNAP3 qui ont exprim\ue9 une r\ue9sistance \ue0 trois agents pathog\ue8nes ont \ue9t\ue9 cuits en 46-56 minutes et sont recommand\ue9s comme sources de r\ue9sistance pour la reproduction, mais pourraient \ueatre encore am\ue9lior\ue9s pour une cuisson rapide et la qualit\ue9 de la mise en conserve \ue9tant donn\ue9 qu\u2019une qualit\ue9 g\ue9n\ue9rale de mise en conserve inf\ue9rieure \ue0 la moyenne a \ue9t\ue9 observ\ue9e. Les soixante-huit g\ue9notypes ont \ue9t\ue9 cuits en moins de 50 minutes tandis que 24 exprimaient une qualit\ue9 visuelle de mise en conserve bonne \ue0 excellente. Les g\ue9notypes comme RAZ-120, RAZ36-Caballero, NavyLine-60, NavyLine-25, ZABR16573-25F22, ZABR16575-60F22, ETSNAP33, Bifortsmallseed-15 et ZABR16574-37F22, cuits en moins de 45 minutes, pr\ue9sentaient une bonne \ue0 excellente mise en conserve la qualit\ue9 et la r\ue9sistance \ue0 une r\ue9ponse interm\ue9diaire aux maladies \ue9valu\ue9es ont \ue9t\ue9 recommand\ue9es \ue0 des fins de s\ue9lection et pour une \ue9valuation plus approfondie en vue d\u2019une promotion \ue9ventuelle