Physiological studies on the stamping of wheat. : III On the mechanism of morphological changes caused by stamping.

[摘要] 1. It was reported formerly by the authors, that the following changes were observed as the after effects of stamping:- a) Reduced plant height, numerous stems and leaves and deepend roots are the morphological features of the stamped plants. b) Observation on the epidermal cells and stomata of the stamped leaves showed reduction in their size and increase in the stomata frequency. And other physiological characteristics which can be seen in the xerophyte plant. c) Spikelet differentiation was delayed by the stamping at the seedling stage and the growth and development of the spike which had been differentiated before the treatment was checked. 2. Bending or harming severally enforced on the leaves or stems resulted these morphological and physiological changes. The checking effect on growth was distinct in harmed plant, and increase of stems, in bent one. 3. Plants showed more amount of transpirated loss of water caused by bleeding water from the wounds by harming or bending treatments. 4. The increased content of nitrogen, but none in the total carbohydrates, was indicated by chemieal analysis of the top parts of plant caused by stamping. Leaves gained weight per unit of ared when they were bent at the base of blade. 5. By these facts, the mechanism by which the effeets of stamping were brought suggested to be as follows:- a) Stamped leaves lose more water than usual on acoount of the bleeding from their harmed portions; and ascent of water is somewhat checked by the bending; whereupon the tops of plants fall into the condition of temporary shortage of water. Hence, the stamping turus a plant into xerophytic of its feature. b) Increase of the root number and length seen in the stamped plants is attributed to the effects of gained loss of water from the top parts which calls for more absorption of water nevertheless the treatment concurs hardened soil which restrains root growth to some extent.

[学科分类] 农业科学（综合）