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Author  |
Shillo, R., & Halevy, A. H. |
| Title |
Interaction of photoperiod and temperature in flowering-control of Gypsophila paniculata L |
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Journal Article |
| Year |
1982 |
Publication |
Scientia Horticulturae |
Abbreviated Journal |
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16 |
Issue |
4 |
Pages |
385-393 |
| Keywords |
Plants |
| Abstract |
Long day promotes flowering of Gysophila paniculata L cultivar ‘Bristol Fairy’. Repeated treatments with GA3 or GA4 + 7 in short days did not promote flowering. The long photoperiod is effective only at relatively high temperatures. At night temperatures below 12°C, the plants remain vegetative even in long days. Efficient artificial lighting is from incandescent lamps at 60–100 lux. Fluorescent lighting (Cool-White) is not effective. Lighting of 4 hours as a night-break or at the end of the night were equally effective, but 4 hours lighting as a day-extension was less effective. Whole-night lighting promoted flowering more than any of the 4-hour lighting regimes. Cyclic lighting of one third light in each cycle promoted flowering to the same extent as continuous lighting. Light intensity during the day has a decisive effect on flower production. |
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IDA @ intern @ |
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2370 |
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| Author |
Shor, E.; Potavskaya, R.; Kurtz, A.; Paik, I.; Huq, E.; Green, R. |
| Title |
PIF-mediated sucrose regulation of the circadian oscillator is light quality and temperature dependent |
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Journal Article |
| Year |
2018 |
Publication |
Genes |
Abbreviated Journal |
Genes (Basel) |
| Volume |
9 |
Issue |
12 |
Pages |
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Plants |
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Studies are increasingly showing that metabolic and circadian (~24 h) pathways are strongly interconnected, with the circadian system regulating the metabolic state of the cell, and metabolic products feeding back to entrain the oscillator. In plants, probably the most significant impact of the circadian system on metabolism is in its reciprocal regulation of photosynthesis; however, the pathways by which this occurs are still poorly understood. We have previously shown that members of the basic helix-loop-helix (bHLH) transcription factor PHYTOCHROME INTERACTING FACTOR (PIF) family are involved in the photosynthate entrainment of the circadian oscillator. In this paper, using Arabidopsis mutants and overexpression lines, we examine how temperature and light quality affect PIF-mediated sucrose signaling to the oscillator and examine the contributions of individual PIF members. Our results also show that the quality of light is important for PIF signaling, with red and blue lights having the opposite effects, and that temperature affects PIF-mediated sucrose signaling. We propose the light sensitivity of PIF-mediated sucrose entrainment of the oscillator may be important in enabling plants to distinguish between sucrose produced de novo from photosynthesis during the day and the sucrose products of starch degradation at the end of the night. |
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Department of Plant and Environmental Sciences, Institute for Life Sciences, Edmond J. Safra Campus, Givat Ram, Hebrew University, Jerusalem 91904, Israel. rgreen@mail.huji.ac.il |
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English |
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2073-4425 |
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PMID:30551669; PMCID:PMC6316277 |
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GFZ @ kyba @ |
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2155 |
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Siemens, C.W. |
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III. On the influence of electric light upon vegetation, and on certain physical principles involved |
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Journal Article |
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1880 |
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Proceedings of the Royal Society of London |
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Abstr. Pap. Printed Phil. Trans. R. Soc. Lond. |
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30 |
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200-205 |
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210-219 |
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Plants |
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0370-1662 |
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2376 |
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Singhal, R. K., Kumar, M., & Bose, B. |
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Ecophysiological Responses of Artificial Night Light Pollution in Plants |
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Journal Article |
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2018 |
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Russian Journal of Plant Physiology |
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Plants |
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Early in the 20th century, disparate human developmental processes culminate excess artificial light during night time and distort the phenological, physiological and ecological responses, which are sustained in the plants, animals and microorganism from millions of years. Earlier studies regarding artificial light (AL) during the night predominantly covered the drastic effects on animal systems. Although, drastic effects of AL during night time are enormous; therefore, the present topic is focused on the physiological and ecological consequences of artificial night light pollution (ANLP) on plant systems. In these consequences, most of the plant processes under ANLP are affected intensely and cause compelling changes in plant life cycle from germination to maturity. However, severe effects were observed in the case of pollination, photoreceptor signalling, flowering and microhabitats of plants. Along with drastic effects on ecology and environments, its relevance to human developmental processes cannot be avoided. Therefore, we need to equipoise between sustainable environment and steadily human development processes. Further, selection of plant/crop species, which are more responsive to ANLP, can minimize the ecological consequences of night light pollution. Likewise, changing artificial nightscape with the implication of new LEDs (Light Emitting Diodes) lightening policies like UJALA (www.ujala.gov.in), which are low cost, more durable, eco-friendly and less emitter of CO2, have potential to overcome the biodiversity threats, which arise due to old artificial lightening technology from decades. Hence, adopting new advance artificial lightening technology and understanding its impact on plant ecosystem will be a future challenge for plant biologist. |
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IDA @ intern @ |
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2352 |
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| Author |
Singhal, R. K., Kumar, V., Kumar, M., & Bose, B. |
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Responses of different light intensities and continue light during dark period on rice (Oryza sativa L.) seed germination and seedling development |
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Journal Article |
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2019 |
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Journal of Pharmacognosy and Phytochemistry |
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8 |
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4 |
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2602-2609 |
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Plants |
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Temperature, humidity and moisture content are the important abiotic component regulating seedling establishment in plants including rice. Light factor intensity and duration are also important environmental factors regulating rice growth and development. In the growth and development of rice crop germination followed by seedling establishment is the foremost and very important growth stages. Light component such as intensity, direction and duration are the regulating factor for several physiological, biochemical and molecular processes in plants. To consider these facts, in the present piece of work rice seed of HUR-105 grown under different light regimes, from T1 (2000 lux for 12 h during day time + 12 h dark period) (lower light intensity), T2 (4000 lux for 12 h during day time+ 12 h dark period), T3 (6000 lux for 12 h during day time + 12 h dark period) (moderate), T4 (9000 lux for 12 h during day time + 12 h dark period) (optimum) and to T5 (9000 lux for 12h during day time + 200 lux for 12 h during night time). Germination, seedling growth and biochemical parameters were observed at different time intervals. It was observed that germination %, germination index (GI), germination rate index (GRI), coefficient of velocity of germination (CVG), mean germination rate (MGR), seedling vigour (SV), α-amylase activity and soluble sugar content significantly reduced in both the treatments T1 and T5. Further, the mean time germination and insoluble sugar content were increased in T1 and T5 treatment. The present experiment concluded that both lower light intensity (T1) and addition of low light during dark period (considered as night light pollution) causes stress condition and reduce germination and seedling establishment potential of rice crop. |
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IDA @ intern @ |
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2738 |
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