Cucurbit Genetics Cooperative Report 7:8 (article
3) 1984
Pickling Cucumber Inbred Line
Development by Full-sib Family Selection II
K. Lertrat and R. L. Lower
University of Wisconsin, Madison, WI
53706
One of the goals of our breeding program is the development of a
commercial high-yielding mechanically harvestable hybrid
cultivar. After the completion of three cycles of selection for
improving fruit number per plant in two pickling cucumber
populations, HSE-C3 (hardwickii semi-exotic
cycle 3) and GS-C3 (gynoecious synthetic cycle 3), by
S1 recurrent selection (2). We have conducted an
inbred line development program by using full-sib family
selection (1).
The second generation of this full-sib family selection was
completed in 1983. Average fruit yield of 107 S1 x
S1 (HSE-S1 x GS-S1) crosses was
2.31 fruit per plant, ranging from 0.88 to 3.72 fruit per plant
(Table 1). This fruit yield was not significantly higher than
the average of six check hybrids (1.45 fruit per plant).
However, mean yield was higher than that for a well-adapted
hybrid, 'Calypso'. Twenty-one selfed lines from both populations
(HSE-S2, and GS-S2) were selected on the
basis of hybrid performance (selection intensity 20%) for further
selection. Average fruit yield of the selected crosses was 3.20
fruit per plant.
Table 1. Summary of the second generation of
selection, using full-sib family selection, for the inbred line
development phase in HSE and GS populations. |
|
Number of crosses
|
S1 x S1
|
Range
|
All crosses |
101
|
2.31
|
0.88-3.72
|
Selected crossesa |
21
|
3.20
|
0.90-3.74
|
Hybrid checksb |
6
|
1.45
|
0.86-1.97
|
Calypso |
|
1.87
|
1.80-1.97
|
aSelection intensity
20%. |
bCheck hybrids included
three monoecious cultivars (Clinton, Liberty and SMR 18) and
three gynoecious hybrids (Calypso, Calico and Southern
Belle). |
Literature cited:
- Lertrat, K. and R. L. Lower. 1983. Pickling cucumber inbred line
development by full-sib family selection. Cucurbit Genetics
Coop. Rpt. 6:16-17.
- Nienhuis, J. 1982. Response to different selection procedures
for increased fruit yield in two pickling cucumber populations.
Ph.D. Thesis, University of Wisconsin-Madison.
