242 results match your criteria daylength temperature

Critical Photoperiod and Its Potential to Predict Mosquito Distributions and Control Medically Important Pests.

J Med Entomol 2021 Apr 9. Epub 2021 Apr 9.

Department of Entomology, The Ohio State University, Coffey Road, Kottman Hall, Columbus, OH, USA.

Diapause, a period of arrested development that allows mosquitoes to survive inhospitable conditions, is triggered by short daylengths in temperate mosquitoes. Different populations of mosquitoes initiate diapause in response to a specific photoperiod, or daylength, resulting in population-specific differences in annual cycles of abundance. The photoperiod that causes approximately 50% of a population to initiate diapause is known as the critical photoperiod (CPP). Read More

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Association between meteorological variables and semen quality: a retrospective study.

Int J Biometeorol 2021 Apr 8. Epub 2021 Apr 8.

Laboratorio de Estudios de Interacción Celular en Reproducción y Cáncer, Instituto de Biología y Medicina Experimental (IBYME), Consejo Nacional de Investigaciones Científicas y Técnicas de Argentina (National Research Council of Argentina; CONICET)-Fundación IBYME (FIBYME), Vuelta de Obligado 2490, C1428ADN, Ciudad Autónoma de Buenos Aires, Argentina.

Spermatogenesis is a temperature-dependent process, and high summer temperatures have been linked to lower sperm concentration and count. However, reports describing the association between other meteorological variables and semen quality are scarce. This study evaluated the association between semen quality and temperature, humidity, pressure, apparent temperature (AT), temperature-humidity index (THI), simplified wet-bulb global temperature (sWBGT), and sunshine duration. Read More

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Crop-photoperiodism model 2.0 for the flowering time of sorghum and rice that includes daily changes in sunrise and sunset times and temperature acclimation.

Ann Bot 2021 Apr 4. Epub 2021 Apr 4.

CIRAD, UMR AGAP Institut, Univ Montpellier, Montpellier, France.

Background And Aims: Daylength determines flowering dates. However, questions remain regarding flowering dates in the natural environment, such as the synchronous flowering of plants sown simultaneously at highly contrasting latitudes. The daily change in sunrise and sunset times is the cue for the flowering of trees and for the synchronisation of moulting in birds at the equator. Read More

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Voltine Ecotypes of the Asian Corn Borer and Their Response to Climate Warming.

Insects 2021 Mar 9;12(3). Epub 2021 Mar 9.

Department of Entomology, University of Minnesota, St. Paul, MN 55108, USA.

In the Asian corn borer (ACB), (Guenée), diapause is governed by a multigenetic constitution that responds to daylength and temperature with seasonality. The ACB displays uni- or multivoltinism, depending on its geographic specificity. Hence, warmer temperatures may result in alternation of voltinism in the ACB, which will help in understanding the ecological consequences of climate warming on insects. Read More

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Phytochrome B links the environment to transcription.

J Exp Bot 2021 May;72(11):4068-4084

Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA), Facultad de Agronomía, Av. San Martín 4453, Buenos Aires C1417DSE, Argentina.

Phytochrome B (phyB) senses the difference between darkness and light, the level of irradiance, the red/far-red ratio, and temperature. Thanks to these sensory capacities, phyB perceives whether plant organs are buried in the soil, exposed to full sunlight, in the presence of nearby vegetation, and/or under risk of heat stress. In some species, phyB perceives seasonal daylength cues. Read More

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Changes at a Critical Branchpoint in the Anthocyanin Biosynthetic Pathway Underlie the Blue to Orange Flower Color Transition in .

Front Plant Sci 2021 22;12:633979. Epub 2021 Feb 22.

Department of Biology, College of Arts and Sciences, Santa Clara University, Santa Clara, CA, United States.

Anthocyanins are the primary pigments contributing to the variety of flower colors among angiosperms and are considered essential for survival and reproduction. Anthocyanins are members of the flavonoids, a broader class of secondary metabolites, of which there are numerous structural genes and regulators thereof. In western European populations of , there are blue- and orange-petaled individuals. Read More

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February 2021

The earlier the better? Nesting timing and reproductive success in subalpine cavity-nesting bees.

J Anim Ecol 2021 05 19;90(5):1353-1366. Epub 2021 Mar 19.

Department of Biology, University of Ottawa, Ottawa, ON, Canada.

Reproductive timing can affect an organism's production of offspring and its offspring's success, both of which contribute to its overall fitness. In seasonal environments, the timing of reproductive activity may be restricted to short periods of the year owing to numerous potential selective pressures such as variation in daylength, weather, food availability, predation or competition. We documented the relationships between reproductive timing and individual reproductive success (total reproductive output and offspring success) in subalpine populations of five cavity-nesting solitary bee species. Read More

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Photoperiod decelerates the advance of spring phenology of six deciduous tree species under climate warming.

Glob Chang Biol 2021 Jun 16;27(12):2914-2927. Epub 2021 Mar 16.

NASA Goddard Space Flight Center, Greenbelt, MD, USA.

Vegetation phenology in spring has substantially advanced under climate warming, consequently shifting the seasonality of ecosystem process and altering biosphere-atmosphere feedbacks. However, whether and to what extent photoperiod (i.e. Read More

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Plant Factories Are Heating Up: Hunting for the Best Combination of Light Intensity, Air Temperature and Root-Zone Temperature in Lettuce Production.

Front Plant Sci 2020 28;11:592171. Epub 2021 Jan 28.

Greenhouse Horticulture, Wageningen University and Research, Wageningen, Netherlands.

This study analyzed interactions among photon flux density (PPFD), air temperature, root-zone temperature for growth of lettuce with non-limiting water, nutrient, and CO concentration. We measured growth parameters in 48 combinations of a PPFD of 200, 400, and 750 μmol m s (16 h daylength), with air and root-zone temperatures of 20, 24, 28, and 32°C. Lettuce (. Read More

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January 2021

Spatial and temporal shifts in photoperiod with climate change.

New Phytol 2021 04 9;230(2):462-474. Epub 2021 Mar 9.

Arnold Arboretum of Harvard University, Boston, MA, 02130, USA.

Climate change causes both temporal (e.g. advancing spring phenology) and geographic (e. Read More

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Timing of reproduction and association with environmental factors in female free-roaming dogs in southern India.

Prev Vet Med 2021 Feb 29;187:105249. Epub 2020 Dec 29.

The Royal (Dick) School of Veterinary Studies (R(D)SVS) and the Roslin Institute, Hospital for Small Animals, Easter Bush Veterinary Centre, Midlothian EH25 9RG, UK; Mission Rabies, 4 Castle Street, Cranborne, Dorset BH21 5PZ, UK; The Epidemiology, Economics and Risk Assessment (EERA) Group, The Roslin Institute and the Royal (Dick) School of Veterinary Studies (R(D)SVS), Easter Bush, Midlothian EH25 9RG, UK.

Annual peaks in reproductive activity have been identified in multiple domestic dog populations. However, there is little evidence to describe how these peaks may be associated with environmental factors such as daylength, which plays a well-established role in breeding patterns of seasonally-reproductive species. Data were collected 2016-2020 during 7,743 and 4,681 neuter surgeries on adult female unowned free-roaming dogs in veterinary clinics in Goa and Tamil Nadu respectively. Read More

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February 2021

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

Front Genet 2020 30;11:571188. Epub 2020 Sep 30.

Center for Soybean Research of the State Key Laboratory of Agrobiotechnology and School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China.

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. Read More

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September 2020

Longer photoperiods through range shifts and artificial light lead to a destabilizing increase in host-parasitoid interaction strength.

J Anim Ecol 2020 11 18;89(11):2508-2516. Epub 2020 Sep 18.

College of Life and Environmental Sciences, University of Exeter, Penryn, UK.

Many organisms are experiencing changing daily light regimes due to latitudinal range shifts driven by climate change and increased artificial light at night (ALAN). Activity patterns are often driven by light cycles, which will have important consequences for species interactions. We tested whether longer photoperiods lead to higher parasitism rates by a day-active parasitoid on its host using a laboratory experiment in which we independently varied daylength and the presence of ALAN. Read More

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November 2020

Parental Photoperiod Affects Egg Diapause in a Montane Population of Mormon Crickets (Orthoptera: Tettigoniidae).

Robert B Srygley

Environ Entomol 2020 08;49(4):895-901

Pest Management Research Unit, Northern Plains Agricultural Research Laboratory, USDA-Agricultural Research Service, Sidney, MT.

Insect diapause is a state of arrested development persisting when conditions are favorable for growth. Prolonged diapause, which occurs when insects remain in diapause for multiple years, is uncommon. Mormon crickets Anabrus simplex Haldane, a katydid and pest of rangeland forage and crops, were thought to be biennial in the Bighorn Mountains of Wyoming, but they are able to prolong diapause in the egg stage for multiple years. Read More

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Growing in time: exploring the molecular mechanisms of tree growth.

Tree Physiol 2021 04;41(4):657-678

Department of Plant Physiology, Umeå Plant Science Centre, Umeå University, Umeå SE-901 87, Sweden.

Trees cover vast areas of the Earth's landmasses. They mitigate erosion, capture carbon dioxide, produce oxygen and support biodiversity, and also are a source of food, raw materials and energy for human populations. Understanding the growth cycles of trees is fundamental for many areas of research. Read More

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Period of Boar Ejaculate Collection Contributes to the Yearly Intra-Male Variability of Seminal Plasma Cytokines.

Biology (Basel) 2020 May 20;9(5). Epub 2020 May 20.

Department of Medicine and Animal Surgery, Veterinary Science, University of Murcia, 30100 Murcia, Spain.

The concentrations of cytokines in seminal plasma (SP) fluctuate over time in healthy males, weakening their practical usefulness as diagnostic tools. This study evaluated the relevance of intra-male variability in SP cytokines and to what extent the period of the year when ejaculate is collected contributes to such variability. Thirteen cytokines (GM-CSF, IFNγ, IL-1α, IL-1β, IL-1ra, IL-2, IL-4, IL-6, IL-8, IL-10, IL-12, IL-18, and TNFα) were measured using the Luminex xMAP technology for 180 SP samples of ejaculate collected over a year from nine healthy and fertile boars. Read More

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The Effects of Photoperiod on Diapause Induction in Hypena opulenta (Lepidoptera: Erebidae), a Biological Control Agent Against Invasive Swallow-Worts in North America.

Environ Entomol 2020 06;49(3):580-585

Faculty of Forestry, University of Toronto, Toronto, Ontario, Canada.

Many insects exhibit a short-day diapause response, whereby diapause is induced when daylength falls below a critical threshold. This response is an adaptation to ensure synchrony between periods of insect activity, and the availability of resources, but it can cause problems when organisms are moved to new locations, where early or late-induced diapause can prove a barrier to establishment. We explored the role of photoperiod in diapause induction in Hypena opulenta, a recently introduced classical biological control agent for invasive swallow-worts in North America. Read More

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Cold Acclimation and Deacclimation of Two Garden Rose Cultivars Under Controlled Daylength and Temperature.

Front Plant Sci 2020 24;11:327. Epub 2020 Mar 24.

Department of Plants and Crops, Ghent University, Ghent, Belgium.

Low temperature stress is an important abiotic stress for garden roses in northern regions. Two garden rose cultivars ('Dagmar Hastrup' and 'Chandos Beauty') were selected to study the role of dehydrin and of carbohydrate metabolism during cold acclimation and deacclimation under the controlled daylength and temperature. The presence of bud dormancy was also observed as this could prevent budburst during warm spells. Read More

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Synchronization of photoperiod and temperature signals during plant thermomorphogenesis.

Plant Signal Behav 2020 04 12;15(4):1739842. Epub 2020 Mar 12.

Department of Chemistry, Seoul National University, Seoul, Korea.

It is well-known that even small changes in ambient temperatures by a few degrees profoundly affect plant growth and morphology. This architectural property is intimately associated with global warming. In particular, under warm temperature conditions, plants exhibit distinct morphological changes, such as elongation of hypocotyls and leaf petioles, formation of small, thin leaves, and leaf hyponasty that describes an upward bending of leaf petioles. Read More

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Effects of photoperiod and relative humidity on diapause termination and post-winter development of pupae.

Bull Entomol Res 2020 Oct 12;110(5):588-596. Epub 2020 Mar 12.

Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Fytokou ST., Volos, 384 46Magnesia, Greece.

The European cherry fruit fly, Rhagoletis cerasi (Diptera: Tephritidae), is a univoltine species that undergoes obligatory summer-winter diapause at pupal stage in the soil (2-5 cm) beneath host trees. To study the effects of photoperiod and relative humidity on diapause termination and post-winter developmental duration of R. cerasi, pupae collected from Dossenheim (Germany) were exposed to different photoperiod or relative humidity regimes during a chilling period ranging from 2 to 8. Read More

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October 2020

The effects of extended photoperiod and warmth on hair growth in ponies and horses at different times of year.

PLoS One 2020 14;15(1):e0227115. Epub 2020 Jan 14.

School of Agriculture and Food Science, University College Dublin, Belfield, Dublin, Ireland.

Photoperiod is considered the most dominant environmental cue allowing animals to anticipate and adapt to seasonal changes. In seasonally breeding mammals, changes in daylength alter pineal melatonin secretion and pituitary prolactin secretion. During the seasonal transition to shorter winter daylengths, increased production of melatonin and declining prolactin are associated with triggering winter coat growth in many animals. Read More

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High crop load and low temperature delay the onset of bud initiation in apple.

Sci Rep 2019 11 29;9(1):17986. Epub 2019 Nov 29.

Institute of Crop Science, Dept. of Crop Physiology of Specialty Crops (340f), University of Hohenheim, Stuttgart, Germany.

The reproductive cycle of apple (Malus × domestica Borkh.) starts with the induction of floral development, however, first morphological changes within the bud appear during the following period of bud initiation. This study identifies the onset and duration of bud initiation in the apple cultivars 'Fuji' and 'Gala', characterized by biennial and non-biennial bearing behaviour, respectively, and describes the effect of crop load and heat accumulation on the temporal pattern of floral development. Read More

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November 2019

Herbivore seasonality responds to conflicting cues: Untangling the effects of host, temperature, and photoperiod.

Mariana Abarca

PLoS One 2019 5;14(9):e0222227. Epub 2019 Sep 5.

Department of Biology, Georgetown University, Washington, DC, United States of America.

Organisms from temperate ecosystems experience a cyclic alternation of favorable seasons, when they can grow and develop, and unfavorable periods, characterized by low temperatures and reduced resource availability. A common adaptation to these changing conditions is to undergo a state of metabolic arrest triggered by environmental cues (e.g. Read More

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Shortened temperature-relevant period of spring leaf-out in temperate-zone trees.

Glob Chang Biol 2019 Dec 28;25(12):4282-4290. Epub 2019 Aug 28.

Department of Biology, University of Antwerp, Antwerp, Belgium.

Temperature during a particular period prior to spring leaf-out, the temperature-relevant period (TRP), is a strong determinant of the leaf-out date in temperate-zone trees. Climatic warming has substantially advanced leaf-out dates in temperate biomes worldwide, but its effect on the beginning and length of the TRP has not yet been explored, despite its direct relevance for phenology modeling. Using 1,551 species-site combinations of long-term (1951-2016) in situ observations on six tree species (namely, Aesculus hippocastanum, Alnus glutinosa, Betula pendula, Fagus sylvatica, Fraxinus excelsior, and Quercus robur) in central Europe, we found that the advancing leaf-out was accompanied by a shortening of the TRP. Read More

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December 2019

Identification of loci controlling adaptation in Chinese soya bean landraces via a combination of conventional and bioclimatic GWAS.

Plant Biotechnol J 2020 02 24;18(2):389-401. Epub 2019 Jul 24.

The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Lab of Germplasm Utilization (MOA), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.

Landraces often contain genetic diversity that has been lost in modern cultivars, including alleles that confer enhanced local adaptation. To comprehensively identify loci associated with adaptive traits in soya bean landraces, for example flowering time, a population of 1938 diverse landraces and 97 accessions of the wild progenitor of cultivated soya bean, Glycine soja was genotyped using tGBS . Based on 99 085 high-quality SNPs, landraces were classified into three sub-populations which exhibit geographical genetic differentiation. Read More

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February 2020

Varying temperature sensitivity of bud-burst date at different temperature conditions.

Int J Biometeorol 2021 Mar 5;65(3):357-367. Epub 2019 Jul 5.

Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.

The relationship between the rate of development (DR) of bud-burst and temperature may be nonlinear, which could lead to varying temperature sensitivity (TS) of budburst date under different climate conditions. In order to determine the functional form between DR/TS and temperature, we gathered twigs with flower buds of five woody plants (Malus halliana, Forsythia suspense, Crataegus pinnatifida, Prunus cerasifera F. atropurpurea, and Berberis thunbergii var. Read More

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A generalized phenological model for durum wheat: application to the Italian peninsula.

J Sci Food Agric 2020 Aug 17;100(11):4093-4100. Epub 2019 Jul 17.

Department of Ecology and Sustainable Economic Development, University of Tuscia, Viterbo, Italy.

Background: A likely increasing demand for varieties mixtures, landraces and genetic diversity in cropping systems will underpin calls for models able to generalize phenological development at the species level, at the same time as providing the expected range of phenological variability. In the present article, we aimed to obtain a generalized phenological model of durum wheat (Triticum durum, Desf.). Read More

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Daylength helps temperate deciduous trees to leaf-out at the optimal time.

Glob Chang Biol 2019 07 29;25(7):2410-2418. Epub 2019 Apr 29.

Department of Biology, University of Antwerp, Antwerp, Belgium.

Global warming has led to substantially earlier spring leaf-out in temperate-zone deciduous trees. The interactive effects of temperature and daylength underlying this warming response remain unclear. However, they need to be accurately represented by earth system models to improve projections of the carbon and energy balances of temperate forests and the associated feedbacks to the Earth's climate system. Read More

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Application of HPLC-PDA-MS metabolite profiling to investigate the effect of growth temperature and day length on blackcurrant fruit.

Metabolomics 2019 01 8;15(1):12. Epub 2019 Jan 8.

NIBIO, Norwegian Institute of Bioeconomy Research, Pb 115, 1431, Ås, Norway.

Introduction: Blackcurrant (Ribes nigrum L.) is an excellent example of a "super fruit" with potential health benefits. Both genotype and cultivation environment are known to affect the chemical composition of blackcurrant, especially ascorbic acid and various phenolic compounds. Read More

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January 2019

Genetic dissection of flowering time in Brassica rapa responses to temperature and photoperiod.

Plant Sci 2019 Mar 3;280:110-119. Epub 2018 Nov 3.

Plant Breeding, Wageningen University and Research, 6708 PB, Wageningen, the Netherlands. Electronic address:

The Brassica rapa (B. rapa) species displays enormous phenotypic diversity, with leafy vegetables, storage root vegetables and oil crops. These different crops all have different flowering time, which determine their growing season and cultivation area. Read More

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