3,776 results match your criteria photoperiods temperatures

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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RCB initiates Arabidopsis thermomorphogenesis by stabilizing the thermoregulator PIF4 in the daytime.

Nat Commun 2021 04 6;12(1):2042. Epub 2021 Apr 6.

Department of Botany and Plant Sciences, Institute for Integrative Genome Biology, University of California, Riverside, CA, USA.

Daytime warm temperature elicits thermomorphogenesis in Arabidopsis by stabilizing the central thermoregulator PHYTOCHROME INTERACTING transcription FACTOR 4 (PIF4), whose degradation is otherwise promoted by the photoreceptor and thermosensor phytochrome B. PIF4 stabilization in the light requires a transcriptional activator, HEMERA (HMR), and is abrogated when HMR's transactivation activity is impaired in hmr-22. Here, we report the identification of a hmr-22 suppressor mutant, rcb-101, which surprisingly carries an A275V mutation in REGULATOR OF CHLOROPLAST BIOGENESIS (RCB). Read More

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Sexual dimorphism in ultradian and 24h rhythms in plasma levels of growth hormone in Indian walking catfish, .

Chronobiol Int 2021 Apr 6:1-13. Epub 2021 Apr 6.

Fish Endocrinology Laboratory, Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi, India.

Growth hormone (GH), a key regulator of somatic and reproductive growth in vertebrates, has been extensively studied, although primarily in female fish. Despite numerous reports about sex- and species-specific growth patterns in fish, to our knowledge, there is no report about the 24 h rhythm of plasma GH in male fish. Thus, we aimed to investigate temporal variations in plasma GH levels and the existence of any rhythms therein during the reproductively active months of March to August in the male walking catfish, . Read More

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Effect of Season and Social Environment on Semen Quality and Endocrine Profiles of Three Endangered Ungulates (, and ).

Animals (Basel) 2021 Mar 22;11(3). Epub 2021 Mar 22.

Reproductive Biology and Ecology Group, Museo Nacional de Ciencias Naturales (CSIC), 28006 Madrid, Spain.

Knowledge of factors affecting semen quality could be of great importance for the collection and preservation of semen from threatened animals. To assess the effect of seasonality, sperm parameters and testosterone levels were examined throughout the year and compared with the distribution of conceptions. Cuvier's gazelle showed higher sperm quantity in April, coinciding with one peak of conceptions. Read More

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Phenology and Floret Development as Affected by the Interaction between and .

Plants (Basel) 2021 Mar 12;10(3). Epub 2021 Mar 12.

Department of Crop and Forest Sciences-AGROTECNIO CERCA Center, University of Lleida, Av. R. Roure 191, 25198 Lleida, Spain.

Earliness per se () genes may play a critical role in further improving wheat adaptation and fine-tuning wheat development to cope with climate change. There are only few studies on the detailed effect of on wheat development and fewer on the interaction of with the environment and other genes determining time to anthesis. Furthermore, it seems relevant to study every newly discovered gene and its probable interactions as the mechanisms and detailed effects of each may be quite different. Read More

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Wheat Developmental Traits as Affected by the Interaction between and Temperature under Contrasting Photoperiods with Insensitive Background.

Plants (Basel) 2021 Mar 13;10(3). Epub 2021 Mar 13.

Department of Crop and Forest Sciences-AGROTECNIO CERCA Center, University of Lleida, Av. R. Roure 191, 25198 Lleida, Spain.

Earliness () genes are important to fine tune adaptation, and studying their probable pleiotropic effect on wheat yield traits is worthwhile. In addition, it has been shown that some genes interact with temperature and therefore determining the likely × temperature interaction is needed for each newly identified gene. We studied two NILs differing in the newly identified (carrying insensitive -D1 in the background) under three temperature regimes (9, 15 and 18 °C) and two photoperiods (12 and 24 h). 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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Plant design gets its details: Modulating plant architecture by phase transitions.

Plant Physiol Biochem 2021 Mar 26;163:1-14. Epub 2021 Mar 26.

University of Campinas (UNICAMP), Biology Institute, Plant Biology Department, Rua Monteiro Lobato, 255 CEP 13, 083-862, Campinas, SP, Brazil. Electronic address:

Plants evolved different strategies to better adapt to the environmental conditions in which they live: the control of their body architecture and the timing of phase change are two important processes that can improve their fitness. As they age, plants undergo two major phase changes (juvenile to adult and adult to reproductive) that are a response to environmental and endogenous signals. These phase transitions are accompanied by alterations in plant morphology and also by changes in physiology and the behavior of gene regulatory networks. Read More

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Prepubertal gonad investment modulates thymus function: evidence in a teleost fish.

J Exp Biol 2021 Mar 31;224(Pt 7). Epub 2021 Mar 31.

Normandy University, FR CNRS 3730 SCALE, UMR-I 02 INERIS-URCA-ULH Environmental Stress and Aquatic Biomonitoring (SEBIO), University of Le Havre Normandy, 76600 Le Havre, France.

Thymus plasticity following gonadectomy or sex hormone replacement has long since exemplified sex hormone effects on the immune system in mammals and, to a lesser extent, in 'lower vertebrates', including amphibians and fish. Nevertheless, the underlying physiological significances as well as the ontogenetic establishment of this crosstalk remain largely unknown. Here, we used a teleost fish, the European sea bass, , to investigate: (1) whether the regulation of thymus plasticity relies on resource trade-off with somatic growth and reproductive investment and (2) if the gonad-thymus interaction takes place during gonadal differentiation and development. Read More

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Production of Carotenoids from Cultivated Seaweed.

Adv Exp Med Biol 2021 ;1261:21-27

The OCU Research Center for Artificial Photosynthesis, Osaka, Japan.

Cladosiphon (C.) okamuranus, a brown alga endemic to the Nansei Islands, Japan, has been conventionally ingested as food. Nowadays, it is a major aquatic product of the Okinawa Prefecture with an annual production of around 20,000 tons. Read More

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Regeneration of Clematis Plants in the Nikita Botanical Garden via Somatic Embryogenesis and Organogenesis.

Front Plant Sci 2021 12;12:541171. Epub 2021 Mar 12.

Floriculture Laboratory, FSFIS "The Nikita Botanical Gardens - National Scientific Center of the RAS," Yalta, Russia.

The effects of growth regulators, namely, 6-benzylaminopurine (BAP) and thidiazuron (TDZ), on the morphogenic capacity of 13 cultivars of clematis plants, in terms of their morphological structure formation, shoot regeneration, and somatic embryo development, are presented. The clematis cultivars 'Alpinist,' 'Ay-Nor,' 'Bal Tsvetov,' 'Crimson Star,' 'Crystal Fountain,' 'Kosmicheskaya Melodiya,' 'Lesnaya Opera,' 'Madame Julia Correvon,' 'Nevesta,' 'Nikitsky Rosovyi,' 'Nikolay Rubtsov,' 'Serenada Kryma,' and 'Vechniy Zov' were taken in collection plots of the Nikita Botanical Gardens for use in study. After explant sterilization with 70% ethanol (1 min), 0. Read More

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Melatonin and osmoregulation in fish: A focus on Atlantic salmon Salmo salar smoltification.

J Neuroendocrinol 2021 Mar;33(3):e12955

Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), MNHN, CNRS 7208, SU, IRD 207, UCN, UA, Muséum National d'Histoire Naturelle, Paris, France.

Part of the life cycle of several fish species includes important salinity changes, as is the case for the sea bass (Dicentrarchus labrax) or the Atlantic salmon (Salmo salar). Salmo salar juveniles migrate downstream from their spawning sites to reach seawater, where they grow and become sexually mature. The process of preparation enabling juveniles to migrate downstream and physiologically adapt to seawater is called smoltification. Read More

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Body Temperature and Activity Rhythms Under Different Photoperiods in High Arctic Svalbard ptarmigan ().

Front Physiol 2021 8;12:633866. Epub 2021 Mar 8.

Arctic Chronobiology and Physiology, Arctic and Marine Biology, UiT The Arctic University of Norway, Tromsø, Norway.

Organisms use circadian rhythms to anticipate and exploit daily environmental oscillations. While circadian rhythms are of clear importance for inhabitants of tropic and temperate latitudes, its role for permanent residents of the polar regions is less well understood. The high Arctic Svalbard ptarmigan shows behavioral rhythmicity in presence of light-dark cycles but is arrhythmic during the polar day and polar night. Read More

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First Report of Leaf Spot of Caused by in China.

Plant Dis 2021 Mar 23. Epub 2021 Mar 23.

Anhui Agricultural University, 12486, Biosecurity, Hefei, Anhui, China;

(Bunge) A. DC. is a dense, rounded, deciduous shrub commonly planted in landscapes. Read More

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Phytochrome B and PHYTOCHROME INTERACTING FACTOR8 modulate seasonal growth in trees.

New Phytol 2021 Mar 18. Epub 2021 Mar 18.

Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 901 83, Umeå, Sweden.

The seasonally synchronized annual growth cycle that is regulated mainly by photoperiod and temperature cues is a crucial adaptive strategy for perennial plants in boreal and temperate ecosystems. Phytochrome B (phyB), as a light and thermal sensor, has been extensively studied in Arabidopsis. However, the specific mechanisms for how the phytochrome photoreceptors control the phenology in tree species remain poorly understood. Read More

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The impact of environmental variables on the spread of COVID-19 in the Republic of Korea.

Sci Rep 2021 03 16;11(1):5977. Epub 2021 Mar 16.

Department of Laboratory Medicine, Chung-Ang University College of Medicine, 102 Heukseok-ro, Dongjak-gu, Seoul, 06973, Republic of Korea.

Corona virus disease 2019 (COVID-19) has been declared a global pandemic and is a major public health concern worldwide. In this study, we aimed to determine the role of environmental factors, such as climate and air pollutants, in the transmission of COVID-19 in the Republic of Korea. We collected epidemiological and environmental data from two regions of the Republic of Korea, namely Seoul metropolitan region (SMR) and Daegu-Gyeongbuk region (DGR) from February 2020 to July 2020. Read More

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Transcriptome Analysis Reveals Photoperiod-Associated Genes Expressed in Rice Anthers.

Front Plant Sci 2021 26;12:621561. Epub 2021 Feb 26.

Joint International Research Laboratory of Metabolic and Developmental Sciences, State Key Laboratory of Hybrid Rice, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China.

Environmental conditions, such as photoperiod and temperature, can affect male fertility in plants. While this feature is heavily exploited in rice to generate male-sterile lines for hybrid breeding, the underlying molecular mechanisms remain largely unknown. In this study, we use a transcriptomics approach to identify key genes and regulatory networks affecting pollen maturation in rice anthers in response to different day lengths. Read More

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February 2021

On the modulation and maintenance of hibernation in captive dwarf lemurs.

Sci Rep 2021 Mar 11;11(1):5740. Epub 2021 Mar 11.

Duke Lemur Center, Durham, NC, 27705, USA.

In nature, photoperiod signals environmental seasonality and is a strong selective "zeitgeber" that synchronizes biological rhythms. For animals facing seasonal environmental challenges and energetic bottlenecks, daily torpor and hibernation are two metabolic strategies that can save energy. In the wild, the dwarf lemurs of Madagascar are obligate hibernators, hibernating between 3 and 7 months a year. Read More

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Effect of Parental Photoperiod on Body Size and Developmental Time of Aedes aegypti (Diptera: Culicidae) in Buenos Aires City.

J Med Entomol 2021 Mar 11. Epub 2021 Mar 11.

Departamento de Ecología, Genética y Evolución, and IEGEBA (UBA-CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina.

Many insects use photoperiod as a signal to anticipate upcoming unfavorable conditions. Photoperiod sensitivity may be a relevant factor in Aedes (Stegomyia) aegypti (L.) populations at the cool margins of the species' range, where winter conditions have a strong effect on population dynamics. Read More

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Integrated Analysis of Small RNA, Transcriptome, and Degradome Sequencing Reveals the MiR156, MiR5488 and MiR399 are Involved in the Regulation of Male Sterility in PTGMS Rice.

Int J Mol Sci 2021 Feb 24;22(5). Epub 2021 Feb 24.

MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.

A photoperiod- and thermo-sensitive genic male sterile (PTGMS) line is the basic material for two-hybrid rice and is an important genetic breeding resource. Peiai64S (PA64S) is an important germplasm resource of PTGMS rice, and it has been applied to two-line hybrid rice systems in China. Pollen fertility in PA64S is regulated by the temperature and photoperiod, but the mechanism of the fertility transition is unclear. Read More

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February 2021

Modelling strawberry quality in a longitudinal study under the marketing concept of branding.

Heliyon 2021 Feb 15;7(2):e06165. Epub 2021 Feb 15.

Department of Agricultural, Forest and Food Sciences (DISAFA), University of Turin, Largo Paolo Braccini, 2, Grugliasco (TO), 10095, Piedmont, Italy.

Background: Marketing strategies, such as branding, redefine how consumers perceive quality and create new requirements related to season length and quality homogeneity, among others. For short-day (SD) strawberry cultivar brands, the commercial season is short due to a dependency on temperature and photoperiod. A plausible strategy to extend the commercialization period is to use different varieties within a single brand; however, this has led to inconsistent quality in other fruit crops. Read More

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February 2021

The process of testicular regression also impacts the physiology of the epididymis of the bat Molossus molossus, although with a delay in epididymal response due to sperm storage.

Acta Histochem 2021 Apr 1;123(3):151697. Epub 2021 Mar 1.

Center of Biological and Health Science, UFOB - Universidade Federal do Oeste da Bahia, Barreiras, Bahia, Brazil. Electronic address:

Responsible for post-testicular maturation, concentration, protection and sperm storage, the epididymis is an organ that can be easily subdivided into three segments: caput, corpus and cauda. Each epididymal region displays different morphology and functions within the sperm maturation process. Despite the great importance of this organ, studies on its morphology and hormonal control in bats remain scarce. 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 Mar 2. Epub 2021 Mar 2.

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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Oribatid mite communities in mountain scree: stable isotopes (N, C) reveal three trophic levels of exclusively sexual species.

Exp Appl Acarol 2021 Mar 1;83(3):375-386. Epub 2021 Mar 1.

J.F. Blumenbach Institute of Zoology and Anthropology, Animal Ecology, University of Gӧttingen, Untere Karspüle 2, 37073, Gӧttingen, Germany.

Mountain scree habitats are intermediate habitats between the base of the soil and the bedrock. They are composed of a network of small cracks and voids, and are commonly situated at the lower levels of scree slopes. Their environment is defined by empty spaces inside the scree, the absence of light and photoperiod, low temperature, and resource poor conditions. Read More

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