Growth and tropic movements of plants / by Sir Jagadis Chunder Bose.

  • Bose, Jagadis Chandra, 1858-1937.
Date:
1929
Catalogue details

Licence: In copyright

Credit: Growth and tropic movements of plants / by Sir Jagadis Chunder Bose. Source: Wellcome Collection.

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    CHAPTER IX ACCELERATION OF GROWTH IN SUBTONIC PLANTS ON STIMULATION Acceleration of growth under light—Modifying effect of tonic condi- tion on response to stimulation—Continuity between abnormal and normal response—Enhanced rate of growth under subminimal stimulation—Revival of arrested growth under photic stimula- tion—Acceleration of growth in subtonic organ under electric stimulation .......... CHAPTER X EFFECT OF MECHANICAL STIMULATION ON GROWTH Effect of feeble and of moderate stimulation—Effect of wound— Twining of tendrils—Tactile pits in certain tendrils—Effect of indirect stimulation on growth of tendril—Effect of direct electric stimulation—Immediate and after-effect of mechanical stimulation on growth of tendril—Positive tropic curvature under unilateral mechanical stimulation—Negative tropic curvature under indirect unilateral mechanical stimulation—Electric response of proximal and distal sides of the tendril—Contractile response of the less excitable side of tendril—Inhibitory action of stimulus . CHAPTER XI THE PHOTOTROPIC EFFECT OF LIGHT The hypothesis of specific positive and negative irritability of different organs—The Phototropic Recorder—Positive photo- tropic response of pulvinated organs—Positive curvature of growing organs—Determination of the latent period—Induced variation of growth by light from a single spark—Maximum positive curvature under continued light—Relation between quantity of light and induced curvature—Effect of increasing intensity of light Effect of increasing duration of exposure—- Effect of the angle of the incident light .... CHAPTER XII THE MECHANISM OF PHOTOTROPIC CURVATURE The effects fof direct and indirect stimulation—Enhancement of turgor in leaf of Mimosa under indirect stimulation—Dual impulses generated on stimulation, a quick positive and a slow negative —Longitudinal transmission of impulse—Effect of transverse transmission of impulse across the stem under photic stimula- tion—Transverse transmission of impulse under electric and PAGE 8o 87 IOI