Proceedings
of the XLVI Italian Society of Agricultural Genetics - SIGA Annual Congress
Giardini Naxos, Italy - 18/21
September, 2002
ISBN 88-900622-3-1
Poster Abstract -
4.43
SELECTION OF GERMPLASM WITH GOOD COMBINING
ABILITY IN SUNFLOWER (HELIANTHUS ANNUS L.) II
LAURETI
D., DEL GATTO A.
Istituto
Sperimentale per le Colture Industriali, Via Cinque Torri, 26, 60027, Osimo
germplasm
source, F2 populations, breeding material, narrow based testers
In evaluating some sunflower F2
populations as a source of breeding material, using a narrow base tester, it
was found that the agronomic value of the F1 can be considered for
their potential use (Laureti and Del Gatto, 2001). However, one population from
a good hybrid did not have superior test crosses with the tester used. To check
if this poor performance was dependent on the F2 population itself,
as the consequence of the high heterotic control of the yield in F1,
or on the tester used, in the summer of 2000 the F2 population was
testcrossed with 32 cms lines. The following year (2001), the progenies were
cropped, in irrigated and rainfed conditions in open field, together with the
hybrid source and another control, in a randomised trial with two replications.
Crosses were done pollinating the cms
lines with mixed pollen of many F2 plants of the population source.
The test crosses of half of the cms lines
used were as productive as the original hybrid without interacting with the
watering conditions. Ten test crosses had significantly higher oil content than
the germplasm source but the oil yield was not significantly better. Only three
test crosses had higher absolute oil yields. From these, two were not affected
by downy mildew (Plasmopara
halsteedi) and were four
or five days earlier than the hybrid source.
Results confirmed the validity of using
the progenies of good hybrids as a source of germplasm for breeding. If the
combinations with some cms lines were not good, further testing could help find
a useful combiner. 30 F5 lines, from the tested source, selected per se, for
seed yield, during selfing, will be combined with two of the selected cms lines
in 2002 to look for hybrid combinations yielding more than the original
germplasm source.
|
Genotypes |
Seed yield (t ha-1) |
Oil yield (t ha-1) |
Oil content (%) |
Cycle (d) |
Downy mildew (%) |
|
6 |
3,8 |
1,8 |
52 |
149 |
- |
|
9 |
4,1 |
1,9 |
52 |
140 |
- |
|
13 |
4,0 |
1,8 |
50 |
134 |
1,4 |
|
15 |
3,8 |
1,7 |
48 |
137 |
1,4 |
|
24 |
3,8 |
1,8 |
51 |
142 |
1,4 |
|
26 |
4,0 |
1,8 |
50 |
141 |
5,6 |
|
28 |
4,0 |
1,9 |
53 |
139 |
8,3 |
|
30 |
3,8 |
1,8 |
50 |
143 |
1,4 |
|
32 |
4,3 |
2,0 |
52 |
137 |
- |
|
F1 source |
4,1 |
1,9 |
50 |
144 |
- |
|
Control |
3,1 |
1,5 |
53 |
140 |
- |
References
Laureti D., Del Gatto A. 2001. Selection
of germplasm with good combining ability in sunflower (Helianthus annus L.).
Proceedings of the XLV Italian Society of Agricultural Genetics- SIGA annual
Congress. Salsomaggiore Terme, Italy 26-29 September.