| Records |
| Author |
Caffarra, A.; Donnelly, A. |
| Title |
The ecological significance of phenology in four different tree species: effects of light and temperature on bud burst |
Type |
Journal Article |
| Year |
2011 |
Publication |
International Journal of Biometeorology |
Abbreviated Journal |
Int J Biometeorol |
| Volume |
55 |
Issue |
5 |
Pages |
711-721 |
| Keywords |
Plants |
| Abstract |
The process of adaptation is the result of stabilising selection caused by two opposite forces: protection against an unfavourable season (survival adaptation), and effective use of growing resources (capacity adaptation). As plant species have evolved different life strategies based on different trade offs between survival and capacity adaptations, different phenological responses are also expected among species. The aim of this study was to compare budburst responses of two opportunistic species (Betula pubescens, and Salix x smithiana) with that of two long-lived, late successional species (Fagus sylvatica and Tilia cordata) and consider their ecological significance. Thus, we performed a series of experiments whereby temperature and photoperiod were manipulated during dormancy. T. cordata and F. sylvatica showed low rates of budburst, high chilling requirements and responsiveness to light intensity, while B. pubescens and S. x smithiana had high rates of budburst, low chilling requirements and were not affected by light intensity. In addition, budburst in B. pubescens and S. x smithiana was more responsive to high forcing temperatures than in T. cordata and F. sylvatica. These results suggest that the timing of growth onset in B. pubescens and S. x smithiana (opportunistic) is regulated through a less conservative mechanism than in T. cordata and F. sylvatica (long-lived, late successional), and that these species trade a higher risk of frost damage for the opportunity of vigorous growth at the beginning of spring, before canopy closure. This information should be considered when assessing the impacts of climate change on vegetation or developing phenological models. |
| Address |
Department of Botany, School of Natural Sciences, Trinity College Dublin, Ireland. amelia.caffarra@gmail.com |
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English |
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| ISSN |
0020-7128 |
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Notes  |
PMID:21113629 |
Approved |
no |
| Call Number |
LoNNe @ kyba @ |
Serial |
1675 |
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| Author |
Chaves, I.; Pokorny, R.; Byrdin, M.; Hoang, N.; Ritz, T.; Brettel, K.; Essen, L.-O.; van der Horst, G.T.J.; Batschauer, A.; Ahmad, M. |
| Title |
The cryptochromes: blue light photoreceptors in plants and animals |
Type |
Journal Article |
| Year |
2011 |
Publication |
Annual Review of Plant Biology |
Abbreviated Journal |
Annu Rev Plant Biol |
| Volume |
62 |
Issue |
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Pages |
335-364 |
| Keywords |
Adenosine Triphosphate/metabolism; Animals; Cryptochromes/chemistry/classification/*physiology; DNA Repair; Deoxyribodipyrimidine Photo-Lyase/chemistry/classification/physiology; Homing Behavior; Insects/physiology; *Light Signal Transduction; Magnetics; Mice; Oxidation-Reduction; Phosphorylation/physiology; Plants/*metabolism; blue light |
| Abstract |
Cryptochromes are flavoprotein photoreceptors first identified in Arabidopsis thaliana, where they play key roles in growth and development. Subsequently identified in prokaryotes, archaea, and many eukaryotes, cryptochromes function in the animal circadian clock and are proposed as magnetoreceptors in migratory birds. Cryptochromes are closely structurally related to photolyases, evolutionarily ancient flavoproteins that catalyze light-dependent DNA repair. Here, we review the structural, photochemical, and molecular properties of cry-DASH, plant, and animal cryptochromes in relation to biological signaling mechanisms and uncover common features that may contribute to better understanding the function of cryptochromes in diverse systems including in man. |
| Address |
Department of Genetics, Erasmus University Medical Center, 3000 CA Rotterdam, The Netherlands. i.chaves@erasmusmc.nl |
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English |
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| ISSN |
1543-5008 |
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| Notes |
PMID:21526969 |
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no |
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IDA @ john @ |
Serial |
341 |
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| Author |
Nelson, J.A.; Bugbee, B. |
| Title |
Economic analysis of greenhouse lighting: light emitting diodes vs. high intensity discharge fixtures |
Type |
Journal Article |
| Year |
2014 |
Publication |
PloS one |
Abbreviated Journal |
PLoS One |
| Volume |
9 |
Issue |
6 |
Pages |
e99010 |
| Keywords |
Plants |
| Abstract |
Lighting technologies for plant growth are improving rapidly, providing numerous options for supplemental lighting in greenhouses. Here we report the photosynthetic (400-700 nm) photon efficiency and photon distribution pattern of two double-ended HPS fixtures, five mogul-base HPS fixtures, ten LED fixtures, three ceramic metal halide fixtures, and two fluorescent fixtures. The two most efficient LED and the two most efficient double-ended HPS fixtures had nearly identical efficiencies at 1.66 to 1.70 micromoles per joule. These four fixtures represent a dramatic improvement over the 1.02 micromoles per joule efficiency of the mogul-base HPS fixtures that are in common use. The best ceramic metal halide and fluorescent fixtures had efficiencies of 1.46 and 0.95 micromoles per joule, respectively. We also calculated the initial capital cost of fixtures per photon delivered and determined that LED fixtures cost five to ten times more than HPS fixtures. The five-year electric plus fixture cost per mole of photons is thus 2.3 times higher for LED fixtures, due to high capital costs. Compared to electric costs, our analysis indicates that the long-term maintenance costs are small for both technologies. If widely spaced benches are a necessary part of a production system, the unique ability of LED fixtures to efficiently focus photons on specific areas can be used to improve the photon capture by plant canopies. Our analysis demonstrates, however, that the cost per photon delivered is higher in these systems, regardless of fixture category. The lowest lighting system costs are realized when an efficient fixture is coupled with effective canopy photon capture. |
| Address |
Crop Physiology Laboratory, Department of Plant Soils and Climate, Utah State University, Logan, Utah, United States of America |
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English |
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1932-6203 |
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| Notes |
PMID:24905835; PMCID:PMC4048233 |
Approved |
no |
| Call Number |
GFZ @ kyba @ |
Serial |
2233 |
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Liu, J.D.; Goodspeed, D.; Sheng, Z.; Li, B.; Yang, Y.; Kliebenstein, D.J.; Braam, J. |
| Title |
Keeping the rhythm: light/dark cycles during postharvest storage preserve the tissue integrity and nutritional content of leafy plants |
Type |
Journal Article |
| Year |
2015 |
Publication |
BMC Plant Biology |
Abbreviated Journal |
BMC Plant Biol |
| Volume |
15 |
Issue |
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Pages |
92 |
| Keywords |
Plants |
| Abstract |
BACKGROUND: The modular body structure of plants enables detached plant organs, such as postharvest fruits and vegetables, to maintain active responsiveness to environmental stimuli, including daily cycles of light and darkness. Twenty-four hour light/darkness cycles entrain plant circadian clock rhythms, which provide advantage to plants. Here, we tested whether green leafy vegetables gain longevity advantage by being stored under light/dark cycles designed to maintain biological rhythms. RESULTS: Light/dark cycles during postharvest storage improved several aspects of plant tissue performance comparable to that provided by refrigeration. Tissue integrity, green coloration, and chlorophyll content were generally enhanced by cycling of light and darkness compared to constant light or darkness during storage. In addition, the levels of the phytonutrient glucosinolates in kale and cabbage remained at higher levels over time when the leaf tissue was stored under light/dark cycles. CONCLUSIONS: Maintenance of the daily cycling of light and dark periods during postharvest storage may slow the decline of plant tissues, such as green leafy vegetables, improving not only appearance but also the health value of the crops through the maintenance of chlorophyll and phytochemical content after harvest. |
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Department of BioSciences, Rice University, Houston, TX, 77005, USA. braam@rice.edu |
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English |
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1471-2229 |
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| Notes |
PMID:25879637; PMCID:PMC4396971 |
Approved |
no |
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LoNNe @ kyba @ |
Serial |
1458 |
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| Author |
Margot, J.-L. |
| Title |
Insufficient Evidence of Purported Lunar Effect on Pollination in Ephedra |
Type |
Journal Article |
| Year |
2015 |
Publication |
Journal of Biological Rhythms |
Abbreviated Journal |
J Biol Rhythms |
| Volume |
30 |
Issue |
5 |
Pages |
454-456 |
| Keywords |
Animals; Plants; Moonlight |
| Abstract |
It has been suggested that the timing of pollination in Ephedra foeminea coincides with the full moon in July. The implication is that the plant can detect the full moon through light or gravity and that this trait is an evolutionary adaptation that aids the navigation by pollinating insects. Here we show that there are insufficient data to make such a claim, and we predict that pollinations of E. foeminea do not in general coincide with the full moon. |
| Address |
Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, California, USADepartment of Physics and Astronomy, University of California, Los Angeles, California, USA jlm@astro.ucla.edu |
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English |
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0748-7304 |
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| Notes |
PMID:26316347 |
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no |
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LoNNe @ kyba @ |
Serial |
1557 |
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