K. C. Hamner
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View article: The Participation of Two Rhythms in the Leaf Movements of <i>Xanthium</i> Plants Given Various Light-Dark Cycles
The Participation of Two Rhythms in the Leaf Movements of <i>Xanthium</i> Plants Given Various Light-Dark Cycles Open
We have shown Xanthium strumarium exhibit two distinct leaf movement rhythms with one occurring in continuous light and presumably related to an endogenous rhythm initiated by the "light-on" signal and the other occurring in continuous dar…
View article: Rhythmic Leaf Movements in Biloxi Soybean and Their Relation to Flowering
Rhythmic Leaf Movements in Biloxi Soybean and Their Relation to Flowering Open
The rhythmic leaf movement of Biloxi soybean (Glycine max) and its relationship to the rhythmic flowering response were studied. The movements of fully expanded trifoliate leaves were recorded with kymographs and time lapse photography in …
View article: A Comparison of the Effects of Autoclaved and Nonautoclaved Gibberellic Acid on <i>Lemna perpusilla</i> 6746
A Comparison of the Effects of Autoclaved and Nonautoclaved Gibberellic Acid on <i>Lemna perpusilla</i> 6746 Open
Gibberellic acid was reported to inhibit flowering, reduce frond size, and increase the multiplication rate of aseptically cultured Lemna perpusilla 6746 when autoclaved with the medium (4), but there are no reports on the effects of non- …
View article: Circadian Leaf Movements in Biloxi Soybeans
Circadian Leaf Movements in Biloxi Soybeans Open
Leaf movement in Biloxi soybean has been investigated in some detail by Bunning (1) and Holdsworth (2).The results and the interpretations presented by these investigators differ with regard to the nature of the leaf movement response.Bun-…
View article: Computer Analysis of the Leaf Movements of Pinto Beans
Computer Analysis of the Leaf Movements of Pinto Beans Open
Computer analysis was used for the detection of rhythmic components and the estimation of period length in leaf movement records. The results of this study indicated that spectral analysis can be profitably used to determine rhythmic compo…
View article: Floral Inhibition of Biloxi Soybean During a 72-hour Cycle
Floral Inhibition of Biloxi Soybean During a 72-hour Cycle Open
The inhibitory effect of light interruptions given during the photophobe phases of a 72-hour cycle was studied with Biloxi soybean [Glycine max (L.) Merr.]. The basic 72-hour cycle consisted of 8 hours of light followed by 64 hours of dark…
View article: Studies of the Involvement of an Endogenous Rhythm in the Photoperiodic Response of <i>Hyoscyamus niger</i>
Studies of the Involvement of an Endogenous Rhythm in the Photoperiodic Response of <i>Hyoscyamus niger</i> Open
An attempt was made to determine the involvement of an endogenous circadian rhythm in the flowering response of the long-day plant Hyoscyamus niger L. grown in a modified White's medium. Both variable-cycle-length and light interruption ex…
View article: Control of Flowering of <i>Xanthium pensylvanicum</i> by Red and Far-red Light
Control of Flowering of <i>Xanthium pensylvanicum</i> by Red and Far-red Light Open
A study was made of the effects of various durations, intensities and combinations of red and far-red light interruptions on the flowering responses of Xanthium pensylvanicum Wallr. A dual response to treatments of far-red light was observ…
View article: Quantitative Assay of Photoperiodic Floral Inhibition and Stimulation in Biloxi Soybean
Quantitative Assay of Photoperiodic Floral Inhibition and Stimulation in Biloxi Soybean Open
Evidence has accumulated to suggest the involvement of an endogenous rhythm in the photoperiodic flowering response of long and short day plants. Recent investigations with Biloxi soybean have shown that light breaks applied during the 64-…
View article: Studies on Red Light Interruption in Relation to Timing Mechanisms Involved in the Photoperiodic Response of <i>Pharbitis nil</i>
Studies on Red Light Interruption in Relation to Timing Mechanisms Involved in the Photoperiodic Response of <i>Pharbitis nil</i> Open
In a previous paper (2) it has been suggested that at least 3 kinds of timingimechanisms are involved in the photoperiodic response of Phlar-bitis nil.The first timing component is similar to an hourglass in that a linear increase in the f…
View article: Effect of Double Red Light Interruptions on the Photoperiodic Response of <i>Pharbitis nil</i>
Effect of Double Red Light Interruptions on the Photoperiodic Response of <i>Pharbitis nil</i> Open
In previous papers (2, 3) it was suggested that 2 endogenous circadian rhythms were associated with the photoperiodic response of Pharbitis; one was initiated by the beginning of the light period (lighton signal) and the other was initiate…
View article: Kinetic Studies on Pigment Systems Concerned with the Photoperiodic Response in <i>Pharbitis nil</i>
Kinetic Studies on Pigment Systems Concerned with the Photoperiodic Response in <i>Pharbitis nil</i> Open
In many short-day and long-day plants the action spectrum for inhibition or promotion of flowering by a light interruption of the dark period shows a peak in the red (660 m,u). The effect of this red light interruption is reversed by succe…
View article: The Effect of Dual Perturbations on the Rhythmic Flowering Response of Biloxi Soybean
The Effect of Dual Perturbations on the Rhythmic Flowering Response of Biloxi Soybean Open
Evidence is accumulating to indicate that an endogenous circadian rhythm is participating in the photoperiodic response of Biloxi soybean (2, 5).Circadian rhythms of activity and behavior have been found throughout the plant and animal kin…
View article: Effect of Temperature and Preconditioning on Photoperiodic Response of <i>Pharbitis nil</i>
Effect of Temperature and Preconditioning on Photoperiodic Response of <i>Pharbitis nil</i> Open
Temperature and preconditioning effect on photoperiodic response of Pharbitis nil, strain Violet short-day plant
View article: Photoperiodic Flowering Response of Biloxi Soybean in 72-Hour Cycles
Photoperiodic Flowering Response of Biloxi Soybean in 72-Hour Cycles Open
Recently, evidence has accunmulated to indicate that the photoperiodic control -of floral induction is mediated by an endogenous rhythm with periods of approximately 24 hours (9, 10, 11, 12, 13, 18, 19, 20, 21, 22).It has long been known t…
View article: Floral inhibition in relation to photoperiodism in Biloxi soybean
Floral inhibition in relation to photoperiodism in Biloxi soybean Open
Biloxi soybean is a short day plant with a critical photoperiod of about 14y2 hours. It has been demonstrated that if short days are given in direct succession, the number of nodes which produce flowers on a plant is directly proportional …
View article: Photoperiodism and Circadian Rhythms
Photoperiodism and Circadian Rhythms Open
Many of you were present at the conference on photoperiodism held in Gatlinburg, Tennessee, in October 1957, the title of which was "Photoperiodism and Related Phenomena in Plants and Animals" [1] At the conference I presented a paper base…
View article: An Effect of Gibberellic Acid on the Flowering of Xanthium, a Short Day Plant.
An Effect of Gibberellic Acid on the Flowering of Xanthium, a Short Day Plant. Open
vinelanidii.The related compounds tested, phenoxyacetic acid, phenylpropionic acid, ortho-and para- chlorophenoxyacetic acids, inhibited the test organ- ism to lesser degrees.Protection from the inhibition produced by 2 x 10-2 MI phenoxyac…
View article: PHOTOTUBE-TYPE INTEGRATING LIGHT RECORDERS: A SUMMARY OF PERFORMANCE OVER A FIVE-YEAR PERIOD
PHOTOTUBE-TYPE INTEGRATING LIGHT RECORDERS: A SUMMARY OF PERFORMANCE OVER A FIVE-YEAR PERIOD Open
In recent years considerable attention has been given to a study of the relationship between the amount of light a plant receives and its vitamin content (1, 2, and 3). Such a relationship can be studied under laboratory and greenhouse con…
View article: THE INFLUENCE OF MINERAL NUTRITION, SOIL FERTILITY, AND CLIMATE ON CAROTENE AND ASCORBIC ACID CONTENT OF TURNIP GREENS
THE INFLUENCE OF MINERAL NUTRITION, SOIL FERTILITY, AND CLIMATE ON CAROTENE AND ASCORBIC ACID CONTENT OF TURNIP GREENS Open
Previous investigations from this laboratory with tomatoes (2, 7) have indicated that the ascorbic acid and carotene content of the tomato fruit is influenced but little by the supply of mineral nutrients to the plants.This work was done w…