CARBOHYDRATE METABOLISM AND GROWTH IN EDIBLE CANNA 29 
Table 12. — Differences in the sugars in sap of dormant and actively growing -plank 
(DORMANT) HILL NO. 1, 13 MONTHS OLD, WAIMEA FIELD A 
Genera- 
tion 
Stage of maturity 
Sucrose in sap 
Hexoses in sap 
Total sugars in sap 
2 G 
■sa 
" C3 
Root- 
stock 
Stem 
i 
Root- 
stock 
Stem 
1 
First. 
Old Group 2 
Per cent 
0.96 
.76 
.79 
.82 
.51 
.99 
Pereent 
0.64 
.58 
i 
Percent Ptrcent 
0. 18 1. 25 
.13 1.53 
Per cent 
1.14 
.89 
.84 
1.06 
.52 
1.23 
Per cent 
1 89 
2 Second . 
3 Third... 
4 Fourth . 
Medium Group 2 
2. 11 
do 
. 91 . 05 1. 70 
.41 
2 61 
Young Group 2. 
2 59 
5 ...do 
Old; spike, dead. 
•01 
.24 .87 
6 
Old Group 3a 
.35 
1 22 
(ACTIVELY GROWING) HILL NO. 2, 15 MONTHS OLD, WAIMEA FIELD A 
7 Third. .. 
8 Fourth . 
9 Fifth ... 
10 Sixth ... 
11 Seventh. 
Medium Group2. 
Old Group 3a 
do 
Young Group 3a. 
Group 3b (spike) 
1.82 
1.34 
0.19 
3.41 
2.01 
.90 
1.01 
.09 
2.48 
.99 
1.03 
.90 
.14 
2.31 
1.17 
1.51 
.26 
.33 
.83 
1.84 
1.46 
.64 
2.10 
4.75 
3.49 
3.21 
1.09 
'Sample No. 7, third generation, hill 2, is comparable with sample No. 3, hill 1, since the first and 
second generations were not included in the analysis of hill 2. 
The dormant canna (fig. 17) w T as conspicuous by the abnormally low 
sucrose content of its rootstocks. The hexoses of the stems were also 
considerably below those previously noted in canna grown at Waimea. 
(Table 7, hill 4.) 
Both the hexoses and the sucrose were greater in old stems of the 
vigorously growing canna than in the dormant canna. Although in 
sample No. 7, third generation of the actively growing canna, the 
sucrose increased, in samples 8 and 9 of the fourth and fifth genera- 
tions, respectively, it showed little increase over samples Nos. 4 and 
6 of the corresponding generations of the dormant canna, notwith- 
standing the increase in sugars in the stems. However, the sugars 
in the rootstocks of the sixth and seventh generations of the actively 
growing canna, representing the new growth, were rather normal for 
Groups 3a and 3b stages of development. 
These results confirm observations previously made (p. 26) that 
usually when sugars within a rootstock decrease to a low level for a 
prolonged period they do not again increase unless hydrolysis of 
starch occurs. Whether this indicates a loss in amylogenic power in 
such rootstocks is not certain. That this is sometimes the case would 
seem to be indicated by the very low starch content frequently ob- 
served in rootstocks in the dormant stage, Group 1 . The recovery 
of the Waimea field from a dormant period with subsequent produc- 
tion of good-sized rootstocks in its new growth, in striking contrast 
with the severe stunting of the new- growth at the station, may be 
attributed to the unaffected condition of the stem grow T th, which con- 
tinued to function, whereas at the station it was practically de- 
stroyed. 
