A modified mass selection scheme for creating winter-hardy faba bean (Vicia faba L.) lines with a broad genetic base

作者：Landry Erik J^*; Coyne Clarice J; Mcgee Rebecca J; Hu Jinguo

来源：Euphytica, 2017, 213(3): UNSP 72.

DOI：10.1007/s10681-017-1843-2

• Faba bean (Vicia faba L.)
• Mass selection
• Winter-hardiness
• Legume breeding
• Germplasm resources
• Genetic diversity

Winter-hardy faba bean (Vicia faba L.) from northern Europe is represented by a rather narrow gene pool. Limited selection gains for overwintering below -25 degrees C have restricted the adoption of this crop. Therefore, the faba bean collection maintained by the USDA-ARS National Plant Germplasm System (NPGS) was utilized to broaden this genetic base by identifying potentially new sources of winter-hardiness using a modified mass selection scheme. From an initial source population, bulk-harvested micro-plots of 466 NPGS accessions, four different bulks were formed by harvesting seeds from plants that survived at four locations representing a range of overwintering selection environments across southeastern Washington. These four bulk populations were then mass selected for three cycles based on winter survival along with a selected group of advanced northern European populations or breeding lines at two southeastern Washington locations with divergent climates. This procedure generated breeding materials with winter-hardiness comparable to the northern European populations. We observed that Northern European populations showed slower annual gains in percent survival (<5%) than NPGS bulks (>5%). Further, the frequency of large seeded populations (>80 g x 100 seed(-1)) was reduced over time, suggesting an association between seed size and overwintering. The breeding materials generated by mass selection are useful for the future improvement of faba bean as a fall-sown pulse or cover crop.

• 出版日期2017-3