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QTL analysis of cooking time and quality traits in dry bean (Phaseolus vulgaris L.)
Saturday, 2020/07/04 | 06:20:14

M. BerryP. IzquierdoH. JefferyS. ShawS. Nchimbi-Msolla & K. Cichy 

Theoretical and Applied GeneticsJuly 2020; vol. 133:2291–2305


Key message


Three robust QTL for dry bean cooking time shortened cooking time 11–26 min and co-localized with QTL for increased cooked seed protein concentration.




Cooking time is a major factor associated with consumer preference of dry beans (Phaseolus vulgaris L.). The genetic control of cooking time was investigated with a quantitative trait loci (QTL) study on a recombinant inbred line (RIL) population developed from TZ-27 (slow cooking) and TZ-37 (fast cooking). The RIL population of 146 lines was grown on research farms over 2 years in Arusha and Morogoro, Tanzania. Arusha is an important mid-altitude bean-growing region, with moderate temperatures and reliable rainfall, whereas the low altitude and high temperatures in Morogoro make it unfavorable for bean production. The population exhibited large variation for cooking time with a range of 22–98 min. On average, beans grown in Arusha cooked 15 min faster than those grown in Morogoro. A linkage map developed with 1951 SNP markers was used for QTL analysis. Ten QTL were identified for cooking time, three of which were found in multiple environments. RILs with all three QTL (CT3.1, CT6.1, and CT11.2) cooked on average 11 min faster in Arusha and 26 min faster in Morogoro than RILs with none. Seed attributes were related to cooking time such that seeds with greater seed mass and less seed coat percentage cooked faster. Cooked seed protein concentration ranged from 17.8 to 30.8% across the years and locations. All three of the most robust cooking time QTL co-localized with QTL for protein concentration, and TZ-37 always contributed faster cooking time and increased protein concentration.


See https://link.springer.com/article/10.1007/s00122-020-03598-w

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