Effect of temperature and photoperiod on growth and 
reproduction of Helix aspersa var. maxima

Growth and reproduction of the snail Helix aspersa (Müller) var. maxima were examined at four combinations of temperature and artificial photoperiod and in transparent and opaque containers at two temperatures for over 40 weeks. Effects of temperature on both processes predominated. However, following 10 weeks of oviposition at optimum temperature (20°C), absence of photoperiod inhibited egg-laying throughout a further 15 weeks. Following inhibition of oviposition, the albumen gland atrophied, indicating the storage of secretory products.Snail growth was improved by rearing in opaque rather than transparent containers in a long-day photoperiod. Snail oviposition was unaffected by container type throughout a 28-week period, demonstrating an acute perception of photoperiodicity by snails maintained at low light intensity.

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The influence of nutrition on the response of wheat to above-optimal temperature

Australian Journal of Agricultural Research ◽

10.1071/ar9840129 ◽

1984 ◽

Vol 35 (2) ◽

pp. 129 ◽

Cited By ~ 9

Author(s):

IA Dawson ◽

IF Wardlaw

Keyword(s):

High Temperature ◽

Nutrient Availability ◽

Seedling Emergence ◽

Dry Weight ◽

Triticum Aestivum L ◽

Effect Of Temperature ◽

Vegetative Organs ◽

Two Temperatures ◽

Effects Of Temperature ◽

Phloem Mobility

Wheat plants (Triticum aestivum L. cv. Gabo) were grown at two temperatures (18/13 and 24/19�C, Day/night), either with full nutrient availability or deprived of nutrients after floral initiation or after anthesis, in order to identify possible interactions between nutrient availability and response to a temperature higher than the optimum for grain dry weight accumulation. Nutrient deprivation reduced levels of nitrogen, potassium and calcium in the vegetative organs of the plant at anthesis and maturity, and levels of nitrogen and calcium, but not potassium, in the grain. Differences in the distribution of nitrogen, potassium and calcium can be explained on the basis of their phloem mobility. An interaction was observed between nutrition and temperature in the time from seedling emergence to anthesis, the number of tillers at anthesis and the number of heads per plant at maturity. Within the main culm ear, high temperature and low nutrition reduced grain number. High temperature, but not low nutrition, reduced individual grain weights. However, there were no interactions between nutrition and temperature in regulating these responses. Therefore, although nutrition may be an important factor when considering the effect of temperature on tillering, there is no evidence from this study that nutritional status will mask the effects of temperature on the later stages of ear and grain development.

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The effect of temperature and photoperiod on primary floral induction in three lines of alpine bluegrass

Canadian Journal of Plant Science ◽

10.4141/p96-108 ◽

1997 ◽

Vol 77 (4) ◽

pp. 615-622 ◽

Cited By ~ 1

Author(s):

Michelle Pahl ◽

Barb Darroch

Keyword(s):

Floral Induction ◽

Effect Of Temperature ◽

Short Day ◽

Long Day ◽

Marked Inhibition ◽

Controlled Environments ◽

Primary Induction ◽

Effects Of Temperature ◽

Short Days ◽

Induction Temperature

The effects of temperature and photoperiod on primary floral induction in three lines of alpine bluegrass (Poa alpina L.) were studied in controlled environments. These lines were developed at the Alberta Environmental Centre from single plant accessions collected from the Alberta Rocky Mountains. Plants representing all three lines were subjected to temperatures of 3, 9, and 12 °C under dark (0 h), short-day (8 h), and long-day (18 h) photoperiods for durations of 6, 10, and 14 wk. Plants were subsequently transferred to conditions of 22 °C/15 °C, 18 h photoperiod and heading response was recorded. Primary floral induction was found to be favoured by low temperatures and/or short days with marked inhibition at 12 °C. Complete dark conditions were not inductive. Six weeks of primary induction was suboptimal with only 15% of plants flowering. However, 100% of plants flowered after 10 wk of primary induction at 3 °C under both long-day and short-day conditions. Differences among lines were significant for number of heading plants, number of heads per plant, time to heading, and critical induction duration. Primary induction in line 907 occurred at longer photoperiods, warmer temperatures, and in shorter durations than the other lines indicating a lesser induction requirement. Possible implications are discussed in the use of alpine bluegrass populations for revegetating disturbed mountain sites. Key words: Floral induction, temperature, photoperiod, Poa alpina, alpine bluegrass

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Effects of Temperature and Photoperiod on the Flower Potential in Everbearing Strawberry as Evaluated by Meristem Dissection

Horticulturae ◽

10.3390/horticulturae7110484 ◽

2021 ◽

Vol 7 (11) ◽

pp. 484

Author(s):

Samia Samad ◽

Denis Butare ◽

Salla Marttila ◽

Anita Sønsteby ◽

Sammar Khalil

Keyword(s):

High Temperature ◽

High Temperatures ◽

Yield Potential ◽

Effect Of Temperature ◽

Long Day ◽

Cultivation Period ◽

Meristem Development ◽

Effects Of Temperature ◽

Strawberry Cultivars ◽

Perpetual Flowering

The growing interest in using everbearing (EB) strawberry cultivars to extend the cultivation period has faced some challenges. These include poor runner production due to its perpetual flowering nature; irregular flowering behavior and extended periods of high temperature have caused floral inhibition and reduced yield. As flowering is an interplay between temperature and photoperiod, it is important to investigate the effects of this interaction on the cultivation. Therefore, this study used meristem dissection as a tool to study the effect of temperature and photoperiod on meristem development. Tray plants of two EB strawberry cultivars ‘Florentina’ and ‘Favori’ were grown at 20 °C, 25 °C, and 30 °C under short day (SD) conditions, and subsequently at 20 °C under long day (LD) conditions. The meristem development was analysed every 6 weeks for a 15-week period in SD and for 14 weeks in LD conditions using meristem dissection. The plants showed similar flowering patterns to previously studied everbearing cultivars, which was qualitative LD plants at high temperatures and quantitative LD plants at lower temperatures. Our results show that meristem dissection can be used to determine the temperature and photoperiodic effect on meristem development, and for the occurrence of cropping peaks, and can therefore be used to decide the environmental input and to evaluate yield potential.

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Effect of temperature during the synthesis process of CdSe nanoparticles using the colloidal technique

MRS Advances ◽

10.1557/adv.2020.441 ◽

2020 ◽

Vol 5 (63) ◽

pp. 3389-3395

Author(s):

R. González-Díaz ◽

D. Fernández-Sánchez ◽

P. Rosendo-Francisco ◽

G. Sánchez-Legorreta

Keyword(s):

Scanning Tunneling Microscope ◽

Electron Cloud ◽

Cdse Nanoparticles ◽

Effect Of Temperature ◽

Synthesis Process ◽

Scanning Tunneling ◽

Tunneling Microscope ◽

First Results ◽

Effects Of Temperature ◽

Scanning Electron

AbstractIn this work, the first results of the effects of temperature during the production of Se2- ions and the effect during the interaction of Cd2+ and Se2- ions in the synthesis process of CdSe nanoparticles are presented. The synthesis of CdSe was carried out by the colloidal technique, in the first one we used a temperature of 63 °C to produce Se2- ions and in the second one an interaction temperature of 49 °C. The samples were characterized using a Scanning Electron Microscope (SEM) and a Scanning Tunneling Microscope (STM). From the SEM micrographs it was possible to identify the thorns formation and irregular islands. STM micrographs reveal elliptical shapes with a regular electron cloud profile.

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THE EFFECTS OF TEMPERATURE ON THE GROWTH AND REPRODUCTION IN SIMOCEPHALUS HIMALAYENSIS

Acta Hydrobiologica Sinica ◽

10.3724/sp.j.1035.2010.00794 ◽

2010 ◽

Vol 36 (4) ◽

pp. 794-805 ◽

Cited By ~ 1

Author(s):

Xin-Lu SHI ◽

Cai-Hua QI ◽

Gui-Jie LIU ◽

Shuang-Yan BAO ◽

Xiao-Na HUANG

Keyword(s):

Effects Of Temperature ◽

Growth And Reproduction

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Note on the effect of temperature on a mixed culture of two organisms in symbiotic relation

The Journal of Agricultural Science ◽

10.1017/s0021859600051819 ◽

1939 ◽

Vol 29 (2) ◽

pp. 302-305 ◽

Cited By ~ 3

Author(s):

E. H. Richards

Keyword(s):

Nitrogen Fixation ◽

Mixed Culture ◽

Azotobacter Chroococcum ◽

Mixed Cultures ◽

Effect Of Temperature ◽

Two Temperatures ◽

Symbiotic Relation

1. A study was made of nitrogen-fixation byAzotobacter chroococcumalone in a medium containing dextrose (which it can utilize) and in mixture with a coliform organism on a medium containing no carbohydrate except starch, whichAzotobactercannot utilize unless it be hydrolysed by the coliform organism or some other agency.2. The amount of nitrogen fixed in the mixed cultures was found to be maximal at two temperatures, and a discussion is given of the causes thought to be operative in producing the double maximum.

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Effect of temperature and irradiance on the growth and reproduction of Enteromorpha prolifera J. Ag. (Chlorophycophyta, Chlorophyceae)

Chinese Journal of Oceanology and Limnology ◽

10.1007/s00343-008-0357-0 ◽

2008 ◽

Vol 26 (4) ◽

pp. 357-362 ◽

Cited By ~ 20

Author(s):

Gang Fu ◽

Jianting Yao ◽

Fuli Liu ◽

Jidong Liu ◽

Xiuliang Wang ◽

...

Keyword(s):

Effect Of Temperature ◽

Enteromorpha Prolifera ◽

Growth And Reproduction

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The Effect of Temperature and Humidity May Reduce the Growth Rate of the Coronavirus Disease 2019 Epidemic

10.21203/rs.3.rs-27890/v1 ◽

2020 ◽

Author(s):

Lei Qin ◽

Qiang Sun ◽

Jiani Shao ◽

Yang Chen ◽

Xiaomei Zhang ◽

...

Keyword(s):

Growth Rate ◽

Relative Humidity ◽

Effect Of Temperature ◽

Average Temperature ◽

Temperature And Humidity ◽

Scatter Plots ◽

Low Humidity ◽

Average Relative Humidity ◽

Effects Of Temperature ◽

The Relationship

Abstract Background: The effects of temperature and humidity on the epidemic growth of coronavirus disease 2019 (COVID-19)remains unclear.Methods: Daily scatter plots between the epidemic growth rate (GR) and average temperature (AT) or average relative humidity (ARH) were presented with curve fitting through the “loess” method. The heterogeneity across days and provinces were calculated to assess the necessity of using a longitudinal model. Fixed effect models with polynomial terms were developed to quantify the relationship between variations in the GR and AT or ARH.Results: An increased AT dramatically reduced the GR when the AT was lower than −5°C, the GR was moderately reduced when the AT ranged from −5°C to 15°C, and the GR increased when the AT exceeded 15°C. An increasedARH increased theGR when the ARH was lower than 72% and reduced theGR when the ARH exceeded 72%.Conclusions: High temperatures and low humidity may reduce the GR of the COVID-19 epidemic. The temperature and humidity curves were not linearly associated with the COVID-19 GR.

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