Agriculture Reference
In-Depth Information
C/H S/T C/K
0.0
bcd175
0.0
wmc112
0.0
bcd175
1.5
wmc111
0.9
gdm5
wmc111
2.9
4.5
gwm455
11.2
wmc112
gwm296
6.9
gwm261
12.6
gwm261
12.8
s544tgag1
13.7
24.1
wmc25a
26.1
P44/M54-3
44.0
ppd1
44.4
gwm102
52.5
gwm515c
53.0
ppd1
58.6
wmc18
61.9
wmc190
abc451b
67.6
gwm157
68.8
74.9
abc451
82.9
P37/M39f
77.3
P36/M43-1
84.0
P37/M39g
P41/M321
bcd266b
P41/M51-273
wg184a
86.4
P36/M44-2
84.7
P35/M76-3
P35/M66-4
wPt-3728
99.2
85.3
101.9
mwg950
87.8
wmc181
108.5
wPt-4413
89.8
cfd233
91.2
P41/M32-6
wmc190
118.3
103.2
P32/M37-6
cdo366
119.2
113.0
cfd239
wmc18
wPt-0298
116.3
gwm349
124.6
121.1
gwm311
125.8
s551tgag
131.9
s590tcac
136.9
gwm301
167.9
LMAmc
ksuA1b
wg184
169.3
gwm382
184.1
200.0
P31/M54-1
RGA19(1)
232.5
bcd410c
234.3
abc165b
249.0
Fig. 11.15
Collocation of water-soluble carbohydrate (WSC) and nitrogen (N) concentration (C), content (A), and tiller (T)
QTL measured 180 ºC d postanthesis with the chromosome 2DS
Ppd1
varying in the Cranbrook/Halberd and CD87/Katepwa
populations but not the
Ppd1
-absent Sunco/Tasman population (DTA
=
days to anthesis and PH
=
plant height). The QTLs
were derived from measurements in three to seven environments.
tion with a maximum of 2 to 8 surviving to
produce fertile spikes at maturity (Fig. 11.16).
The numbers of tillers surviving to maturity is
dependent on genotype and environmental condi-
tions (including agronomic considerations such as
nutrition, sowing density, and arrangement)
(Duggan et al., 2005). Development of drought
prior to, and after, stem elongation commonly
lowers tiller survival, leading to reduced spike
number (Hendriks 2004). Tiller senescence rep-
resents a waste of water, critical under water-
limited conditions while dying tillers remobilize
little carbon to surviving spikes (Berry et al.,
2003). Further, in reliably water-limited environ-
ments, retention of large tiller numbers can con-
tribute to excessive water use (Islam and Sedgely
1981). Together, these indicate the need to control
excessive tiller production when water is limiting,
though in some regions tillering enhancement
may be a desirable target to support the dual
