Agriculture Reference
In-Depth Information
6 times, with 7 non-signifi cant differences. GW/spike always had a sig-
nifi cant positive selection differential except for RD at farm HF. KN/spike
(not shown) presented similar results to GW/spike. Natural selection in-
creased TKW once, decreased it 4 times, with 10 non-signifi cant differ-
ences. TKW also had signifi cant positive selection differentials except for
RB at farms GC and HF and RN at farm HF where it was negative, and for
ZH at farm GC where it was not signifi cant.
Figure 3 shows selection differentials for PH and GW/Spike in 2009
for RB, RD, and RN selected by FM and the selection response for the
same populations grown in 2010 at FM. KN/Spike showed the same pat-
tern as GW/Spike. Selection differentials were positive for all three vari-
eties for PH, KN/Spike and GW/Spike, but only RB showed signifi cant
positive responses to selection for these traits. There were no signifi cant
responses for LLSD or TKW.
11.3.2
CROISEMENTS DU ROC
Significant quantitative responses to selection were found in many F3
families at Le Moulon. Table 1 shows significant differences between F3
progeny of selected and non-selected F2 spikes. There were significant
responses to selection for many families, a few are shown as examples.
There were also 9 of 36 families with no significant changes for any trait
measured and several which only showed a significant response to selec-
tion for a few traits. There were more significant differences for PH and
LLSD, whileGWand TKW had fewer families that showed a significant
response to selection. However, PH and LLSD changed in both directions
while the change in GW and TKW was always positive.
For the F3 and F4 populations, it was possible to qualitatively differentiate
among families grown at the same farm, and there were usually one or two
families that stood out to the farmer as being particularly interesting in the fi rst
year. Farmers chose to either continue with all families for the second year or
to discard certain families and add new ones for the 2009-2010 growing sea-
son. Evaluations from 2010 were used to decide on which populations to keep
on each farm for 2010-2011. In 2010-2011 a new methodology was adopted
by the selection network, described in the discussion section.
