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Photoperiodism in Plants.
Ways of finding the pigment and explanations of some of the features of seasonal response are described, including blue or a bluish-green protein that exists in two forms interconvertible by light.
A Reversible Photoreaction Controlling Seed Germination.
* Part of this work was done as a National Research Council Fellow at the University of California, Berkeley. 1 Bonner, J. T., Am. J. Bot., 31, 175 (1944). 2 Skupienski, F. X., Recherches Sur Le
Photoperiodic Responses of Hemp
Flowering of hemp, Cannabis sativa L., variety Kentucky, occurred in all plants at photoperiods of 8-14 hours, inclusive, and the tendency of plants of certain female lines to form male flowers was significantly greater than that of Plants of other lines, indicating that selection for abundant production of male flowers on female plants might be successful.
The Reaction Controlling Floral Initiation.
The equivalence of the control for the size of a pea leaf, after it has developed somewhat in darkness and then is exposed briefly to light, is established with the control of floral initiation in soybean and in barley plants.
Action of Light on Lettuce-Seed Germination
The observations of Flint and McAlister that imbibed seed of some lettuce varieties can be promoted in germination by irradiation in the red portion of the spectrum and inhibited in the infrared were verified and the action spectrum for lettuce-seed germination is the same as that effective for photoperiodic control of floral initiation.
Photoreversibility of Floral Initiation in Chrysanthemum
How light acts in controlling flowering of several varieties of chrysanthemums was studied with greenhouse-grown plants from rooted cuttings and transferred to plant-growth rooms for the duration of the experiments, finding results to agree very closely with macroscopic observations made on other branches of the same plants after the plants had developed for several weeks after the light treatments.
Development of the Macrogametophyte and Embryo of Daucus carota
The development of the female gametophyte, the pollen tubes, and the embryo of Daucus carota was considered in the light of Souèges' theory that the 4-celled embryo is the critical stage in development, and that for any given species the four cells always give rise to the same parts of the embryo.
Effects of Photoperiod on Growth of Trees
The effects of different qualities of supplemental light on the growth of catalpa seedlings indicate that the same photochemical reaction controlling seed germination and flowering and growth of herbaceous plant parts also controls the onset of dormancy and the elongation of new structures of woody plants.
Photoperiodic Pereception in Biloxi Soy Beans
Control of initiation is exercised only through application of photoperiods of proper length to the leaves, and whether the responses secured in these experiments are due to a flower forming hormone or to other causes remains to be determined.
The function of phytochrome in regulation of plant growth.
The finding of several rapid displays and re-evaluation of some previous results indicate that an early consequence of phytochrome action is a change in permeability of the cells involved and possibly of intracellular components.