![]() ![]() ![]() It is the timing of the light transitions (sunrise and sunset) rather than the duration of light or darkness per se that regulates photoperiod-controlled flowering.Ĭircadian rhythm long-day plant night break photoperiod seasonal flowering short-day plant solar rhythm. Internal coincidence predicts the inhibition of SD flowering of the rice plant by a night break (a brief interruption of light), while it also provides a plausible explanation for how a judiciously timed night break promotes Arabidopsis flowering even on short days. The model invokes no presumption of opposite light requirements between LD and SD plants, and further argues against any specific requirement of either light or darkness for SD flowering. The interaction between rhythmic genes entrained to the solar clock and those entrained to the circadian clock form the basis of an internal coincidence model that explains both LD and SD flowering equally well. This report proposes a role of the plant's solar rhythm in promoting seasonal flowering. Nevertheless, extending this explanation to SD flowering in rice, Oriza sativa, requires LD and SD plants to have 'opposite light requirements' as the CO orthologue in rice, HEADING-DATE1 (Hd1), promotes flowering only under short photoperiods. According to the widely accepted external coincidence model, flowering occurs in LD Arabidopsis when the circadian rhythm of the gene CONSTANS (CO) peaks in the afternoon, when it is light during long days but dark when the days are short. Either an alternative format of the web page or manual assistance obtaining the required information will be provided.In photoperiodic flowering, long-day (LD) plants are induced to flower seasonally when the daylight hours are long, whereas flowering in short-day (SD) plants is promoted under short photoperiods. Number of modules: 12000 Estimated Energy Generation: 4.05 million units annually CO2 displacement: 2835 tonnes annually Low break-even period: Around 6. If you have any difficulty viewing a Section 508 Rehabilitation Act Information web page with adaptive technology, please contact the NASA Official or Curator responsible for the web page. However, technical and financial limitations occasionally prevent some information or data from being presented in a manner that is readily accessible to persons with certain disabilities. Section 508 Rehabilitation Act Information: The Science Directorate at NASA Langley Research Center is dedicated to compliance with accessibility standards developed under Section 508 of the Rehabilitation Act. The data obtained through the POWER (Prediction of Worldwide Energy Resources) web services was made possible with collaboration from the the NASA LaRC Sciences Data Center (ASDC). The POWER team could not have completed this task without both technical and scientific inputs from the following Earth Science Division teams: The World Climate Research Programme (WCRP) Global Energy and Water Cycle Experiment's (GEWEX) Surface Radiation Budget (NASA/GEWEX SRB) and the Clouds and the Earth's Radiant Energy System (CERES) projects at NASA LaRC and the Global Modeling and Assimilation Office at the NASA Goddard Space Flight Center. ![]() Redistribution of Data: To assist the POWER Project in providing the best service to the scientific community, we request notification if you transmit POWER data to other researchers.Īcknowledgement: The Prediction of Worldwide Energy Resources (POWER) Project is funded through the NASA Applied Sciences Program within the Earth Science Division of the Science Mission Directorate. Please contact us at POWER Project Team for additional information on sending reference material. It also helps us to assess our value to the community. This will help us determine the use of data that we distribute, which is helpful in optimizing product development. Reprints Please: The POWER Project kindly requests a reference, web link and/or a reprint of any published papers or reports or a brief description of other uses (e.g., posters, oral presentations, etc.) of data products that we have distributed. "These data were obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program." Use of POWER Data: When POWER data products are used in a publication, we request the following acknowledgment be included:
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