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2017 ; 68
(8
): 1927-1939
Nephropedia Template TP
gab.com Text
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English Wikipedia
Evolving gene banks: improving diverse populations of crop and exotic germplasm
with optimal contribution selection
#MMPMID28499040
Cowling WA
; Li L
; Siddique KHM
; Henryon M
; Berg P
; Banks RG
; Kinghorn BP
J Exp Bot
2017[Apr]; 68
(8
): 1927-1939
PMID28499040
show ga
We simulated pre-breeding in evolving gene banks - populations of exotic and crop
types undergoing optimal contribution selection for long-term genetic gain and
management of population genetic diversity. The founder population was based on
crosses between elite crop varieties and exotic lines of field pea (Pisum
sativum) from the primary genepool, and was subjected to 30 cycles of recurrent
selection for an economic index composed of four traits with low heritability:
black spot resistance, flowering time and stem strength (measured on single
plants), and grain yield (measured on whole plots). We compared a small
population with low selection pressure, a large population with high selection
pressure, and a large population with moderate selection pressure. Single seed
descent was compared with S0-derived recurrent selection. Optimal contribution
selection achieved higher index and lower population coancestry than truncation
selection, which reached a plateau in index improvement after 40 years in the
large population with high selection pressure. With optimal contribution
selection, index doubled in 38 years in the small population with low selection
pressure and 27-28 years in the large population with moderate selection
pressure. Single seed descent increased the rate of improvement in index per
cycle but also increased cycle time.