22 
BULLETIN 56, HAWAII EXPERIMENT STATION 
In hill 1, 11 months old, sample No. 3, the rootstock and stem of 
an old Group 2 plant, contained the maximum total sugar. (Fig. 16.) 
In this stage all new growth had ceased and the lower leaves of the 
plant had died, leaving only the apical leaves to function. Through- 
out subsequent generations the sugars decreased rapidly. In the stem 
of sample No. 5, Group 3a, which was still growing at the top, both 
sucrose and the hexoses sharply decreased. Sucrose remained low 
and constant in the stem throughout Group 2, whereas the hexoses 
were much higher. The reverse was true of the rootstock, the hexose 
content being very low and constant throughout Groups 1 and 2, 
with the sucrose content much higher and more variable. Sucrose 
decreased in sample No. 6, Group 3b, whereas the hexose content was 
double that of sample No. 5. A comparison of the total sugars in 
the rootstock and the 
stem shows that in the 
Group 2 stage the stem 
had a greater concentra- 
tion than the rootstock, 
whereas in Group 3a 
the reverse was true, 
although in most cases 
the differences were 
small. Marked varia- 
tions also occurred in 
the other constituents. 
The rootstock of sample 
No. 3 contained the 
maximum dry matter 
and starch content, both 
of green and dry weight, 
and also the maximum 
sugar content. These 
values were remarkably 
constant in samples 
Nos. 2, 3, and 4, Groups 
1 and 2. Sample No. 5, 
a Group 3a rootstock, 
showed a decrease, and sample No. 6, a Group 3b rootstock, a very 
sharp decrease. The solids other than starch showed a similar de- 
crease, except that the maximum value was in sample No. 1, the 
first generation rootstock. 
A consideration of hill 2, 7 months old, shows that it closely 
resembles hill 1, in an adjacent field, except that the sucrose of the 
stems of Group 2 was higher. The decrease, rather than increase, of 
the hexoses in sample No. 11 indicates that the rootstock was old 
with meristem dead, instead of young and fresh as was supposed. 
A number of striking differences, particularly with regard to the 
hexoses of the rootstocks, were observed between hill 3, 3 months 
old, and hill 1, grown in an adjacent field. Beginning with sample No. 
12, the hexoses were about one-fifth that of the sucrose. The 
hexoses increased rapidly and the sucrose decreased until in sample 
No. 15 the former exceeded the latter. The hexoses of the steins 
were very low. The total sugars of the Groups 3a and 3b rootstocks 
were unusually high, owing largely to their high hexose content, 
2nd 3rd 4th 5th 6th /st 2nd 3rd 4th 
GE/VE/SslT/O/V G£N£es4T/0/V 
// MONTHS H/LL 3 MONTHS H/L. 
Fig. 16.— Sugars in different plants within the hill 
