TURGOR AND TENSION ON GROWTH
191
in the longer limb. Table XIII shows how increasing pres— sure enhances the rate of growth till a critical point is reached, beyond which there is a depression. This critical point varies in different plants.
TABLE XIII.—EFFECT OF INCREASED INTERNAL “\DRUS'I‘A'I'It‘ PRESSURE
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( Kysoor). Specimen. Hydrostatic pressure. Rate of growth.
- Normal 0'18 a per second.
i No. I 2 cm. pressure 0'20 ,1. ,, ,,
t 4 cm. ,, 0'11 ’1. ., ,.
- Normal 0'13 a ,, ,,
i No. II em. pressure 0-20 ,1. ,, ,,
1 .i cm. ,, 0°18 a ,. ,.
I i 0111. ,, ... “'15” ,, ,,
v _ _ _ --- __
RESPONSE TO NEGATIVE VARIATION OF TURGOIL
I shall now describe the influence of induced diminution of turgor on the rate of growth.
JIM/rod of plasmolgsis: It‘rperin'umt 7.?.--lieing desirous of demonstrating the responsive growth ’ariations of opposite signs in an iden- tical specimen under alternate increase and diminution of turgor, I continued the axperiment with the same peduncle of Zep/aymnt’tes in which the growth acceleration was induced hy irrigation with warm water. In that experiment the growth rate of (HM/1, per second was enhanced to 0‘20 ,1, per second after irrigation. A strong solution of KNO” was now applied at the root;
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Fm, 71_.__En‘ect of alternate increase and diminution of turgor on the same specimen : N, normal rate under drought; H, enhanced rate under irrigation'with warm water; N’, normal permanent rate after irrigation; P, diminished rate afterplasmo- lysis (Zephyrantlzes).