2l6 
Journal of Agricultural Research 
Vol. XXI, No. 4 
Table I. —Glucose reduced and dry weight and C 0 2 formed by certain sweet potato storage- 
rot fungi, together with the numerical expression of the interrelationship existing between 
the glucose changed and the resulting products as well as between the products themselves 
Organism. 
Solution. 
Dry weight 
of my¬ 
celium pro¬ 
duced (in 
grams). 
Glucose 
remaining 
at the end 
of the ex¬ 
periment 
(in per¬ 
centage by 
weight). 
Amount of 
glucose re¬ 
duced (in 
grams). 
Total 
amount of 
CO2 (in 
grams). 
Fusarium acuminatum . 
fContrc 
\lnocu 
jContrc 
\lnocu 
fContrc 
\lnocu 
fContrc 
\Inocu 
fContrc 
\Inocu 
fContrc 
\Inocu 
fContrc 
\Inocu 
>1. 
9.2 
•55 
9.18 
.09 
9.1 
6 - 35 
9.2 
O 
9. I 
i -5 
9.6 
•05 
9.2 
7 - 93 
ated. 
>1. 
I. 607 
27.510 
15 - 5 2 4 
Sclerotium bataticola . 
[ated. 
>1. 
6. 068 
2 7 - 77 1 
29.327 
Diplodia tubericola . 
ated. 
>1. 
1.972 
7. 628 
6. 066 
Penicillium sp. 
[ated. 
>1. 
6.251 
30. 791 
3 2 * 5 2 3 
Mucor racemosus . 
ated. 
>1. 
1. 127 
25. 762 
12.837 
Botrytis cinerea . 
[ated. 
>1. 
5-377 
27. 271 
3 2 - 7 i 4 
[ated. 
•938 
4 - 345 
2. 718 
Organism. 
Solution. 
Grams of 
CO 2 given 
off per gram 
of glucose 
reduced. 
Dry weight 
of my¬ 
celium (in 
grams pro¬ 
duced by 1 
gm. of 
glucose). 
Coefficient 
of respira¬ 
tion: sugar 
(in grams 
reduced per 
gram CO 2 
formed). 
Economical 
coefficient: 
sugar used 
(in grams 
to produce 
1 gm. dry 
weight). 
Respiratory 
quotient: 
dry weight 
(in grams 
formed per 
gram CO2 
given off). 
Fusarium acuminatum. 
Sclerotium bataticola .. 
Diplodia tubericola. .. 
fCont 
\lnoc 
fCont 
\Inoc 
fCont 
\lnoc 
fCont 
\lnoc 
fCont 
\lnoc 
fCont 
\lnoc 
fCont 
\lnoc 
rol. 
ulated. 
rol. 
0.567 
0. 058 
1.77 
17. II 
O. 103 
ulated. 
rol. 
1.056 
. 218 
•95 
4 - 58 
. 207 
ulated. 
rol. 
•795 
.258 
I. 26 
3-86 
• 325 
PeniciIlium sp. 
Mucor racemosus . 
ulated. 
rol. 
1.056 
. 203 
•95 
4 - 93 
. 192 
ulated. 
rol. 
.498 
.044 
2. 01 
22. 86 
.088 
Botrytis cinerea . 
ulated. 
rol. 
1. 200 
• 197 
•83 
5 - 07 
. 164 
Rhizopus tritici . 
ulated. 
. 625 
. 216 
i -59 
4- 63 
•345 
UNCHANGED GLUCOSE REMAINING IN THE SOLUTION 
With the exception of Diplodia tubericola and Rhizopus tritici the fungi 
either utilized directly practically all the glucose originally present in 
the solution or converted it into other substances (Table I, columns 4 
and 5), the former utilizing about 2.8 and the latter 1.3 per cent. The 
percentage of glucose consumed should be carefully compared with the 
dry weight of mycelium shown in column 3. Fusarium acuminatum 
and Sclerotium bataticola utilized all but 0.55 and 0.09 per cent, respec¬ 
tively, of the glucose and produced 1.61 and 6.1 gm. of mycelium. In 
