Circadian Leaf Movements in Biloxi Soybeans

Brest, David E.; Hoshizaki, T.; Hamner, K. C.

doi:10.1104/pp.45.5.647

Cited by 3 publications

(2 citation statements)

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“…It has been previously reported that the leaf movement of Biloxi soybeans can be classified as a circadian rhythm (2,5). However, a strong photonastic response of Biloxi soybean leaves has also been reported (2,14). The purpose of this experiment was to determine to what extent the movement of the leaves was correlated with the light-to-dark and dark-to-light transitions in 24-hr cycles.…”

Section: Resultsmentioning

confidence: 99%

Rhythmic Leaf Movements in Biloxi Soybean and Their Relation to Flowering

1971

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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 growth chambers. A comparison between the leaf movement rhythm and the rhythmic flowering response indicates that a high degree of similarity exists between the two rhythms. A definite relationship was shown to exist between the direction of the leaf movement and the photophil-photophobe phases of the rhythmic flowering response.Short light perturbations may affect flowering by interacting directly with the flowering process while not affecting the basic endogenous rhythm. Long light perturbations may affect flowering by phase shifting the basic endogenous rhythm. Thus, light perturbations appear to have a dual effect on the flowering response of Biloxi soybean. The hypothesis that both the flowering rhythm and the leaf movement rhythm are coupled to the same basic oscillator is supported by the similarity of the phase shifts induced in the two rhythms by identical light perturbations.

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Section: Resultsmentioning

confidence: 99%

Rhythmic Leaf Movements in Biloxi Soybean and Their Relation to Flowering

1971

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“…Up to now, specific studies on soybean circadian rhythm have been limited, but they can be dated back to the 1950s (Bunning, 1954;Brest, 1970). In those days, it has already been discovered that the circadian movement of trifoliate leaves of soybean, as measured with a kymograph, could last for two weeks after shifting to continuous light in a roughly 24-h fashion relying on the internal clock (Brest, 1970). A much more recent study examined the circadian fluctuations of chlorophyll contents using non-destructive multispectral imaging under drought conditions (Pan et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

The Modification of Circadian Clock Components in Soybean During Domestication and Improvement

Lam

2020

Front. Genet.

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Agricultural production is greatly dependent on daylength, which is determined by latitude. Living organisms align their physiology to daylength through the circadian clock, which is made up of input sensors, core and peripheral clock components, and output. The light/dark cycle is the major input signal, moderated by temperature fluctuations and metabolic changes. The core clock in plants functions mainly through a number of transcription feedback loops. It is known that the circadian clock is not essential for survival. However, alterations in the clock components can lead to substantial changes in physiology. Thus, these clock components have become the de facto targets of artificial selection for crop improvement during domestication. Soybean was domesticated around 5,000 years ago. Although the circadian clock itself is not of particular interest to soybean breeders, specific alleles of the circadian clock components that affect agronomic traits, such as plant architecture, sensitivity to light/dark cycle, flowering time, maturation time, and yield, are. Consequently, compared to their wild relatives, cultivated soybeans have been bred to be more adaptive and productive at different latitudes and habitats for acreage expansion, even though the selection processes were made without any prior knowledge of the circadian clock. Now with the advances in comparative genomics, known modifications in the circadian clock component genes in cultivated soybean have been found, supporting the hypothesis that modifications of the clock are important for crop improvement. In this review, we will summarize the known modifications in soybean circadian clock components as a result of domestication and improvement. In addition to the well-studied effects on developmental timing, we will also discuss the potential of circadian clock modifications for improving other aspects of soybean productivity.

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Les rythmes endogènes des mouvements foliaires chezMimosa pudicaL.

Roblin¹

1977

Journal of Interdisiplinary Cycle Research

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Circadian Leaf Movements in Biloxi Soybeans

Cited by 3 publications

References 1 publication

Rhythmic Leaf Movements in Biloxi Soybean and Their Relation to Flowering

Rhythmic Leaf Movements in Biloxi Soybean and Their Relation to Flowering

The Modification of Circadian Clock Components in Soybean During Domestication and Improvement

Les rythmes endogènes des mouvements foliaires chezMimosa pudicaL.

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