Variation in Germination and Growth Rates of Two Isolates of Beauvaria bassiana (Balsamo) Vuillemin (Deuteromycota: Hyphomycetes at Different Temperatures and their Virulence to Callosobruchus maculatus (Fabricius) (Coleoptera: Bruchidae)

2009 ◽  
Vol 6 (2) ◽  
pp. 102-108 ◽  
Author(s):  
Adaku A. Lawrence ◽  
Ayub Khan
Keyword(s):  
Growth Rates ◽  
Callosobruchus Maculatus ◽  
Different Temperatures ◽  
Germination And Growth

scholarly journals Technical Note: Using DEG CPCs at upper tropospheric temperatures

2014 ◽  
Vol 14 (9) ◽  
pp. 12797-12817 ◽  
Author(s):  
D. Wimmer ◽  
K. Lehtipalo ◽  
T. Nieminen ◽  
J. Duplissy ◽  
S. Ehrhart ◽  
...  
Keyword(s):  
Gas Phase ◽  
Growth Rates ◽  
Room Temperature ◽  
Size Range ◽  
Theoretical Calculations ◽  
Sulfuric Acid Concentration ◽  
Technical Note ◽  
Different Temperatures ◽  
Consistent Picture ◽  
High Uncertainty

Abstract. Over the last few years, several Condensation Particle Counters (CPC) capable of measuring in the sub-3 nm size range have been developed. Here we study the performance of Diethylene glycol (DEG) based CPCs at different temperatures during Cosmics Leaving Outdoor Droplets (CLOUD) measurements at CERN. The data shown here is the first set of verification measurements for sub-3 nm CPCs under upper tropospheric temperatures using atmospherically relevant aerosol particles. To put the results in perspective we calibrated the DEG-CPC at room temperature, resulting in a cut-off diameter of 1.4 nm. All diameters refer to mobility equivalent diameters in this manuscript. At upper tropospheric temperatures between −25 °C and −65 °C, we found cut-off sizes in the range of 2.5 and 2.8 nm. Due to low number concentration after size classification, the cut-off diameters have a high uncertainty (±0.3 nm) associated with them. Operating two laminar flow DEG CPCs with different cut-off sizes together with other aerosol instruments, we looked at the growth rates of aerosol population in the CLOUD chamber for particles smaller than 10 nm at different temperatures. A more consistent picture emerged when we normalized the growth rates to a fixed gas-phase sulfuric acid concentration. All of the instruments detected larger growth rates at lower temperatures, and the observed growth rates decreased as a function of temperature, converging with each other at temperatures over 0 °C. The theoretical calculations had a much smaller temperature dependency.

Adaptive Variability in the Growth of Danthonia caespitosa Gaud. Populations at Different Temperatures

1976 ◽  
Vol 24 (3) ◽  
pp. 381 ◽  
Author(s):  
KC Hodgkinson ◽  
JA Quinn
Keyword(s):  
Growth Rates ◽  
Perennial Grass ◽  
Weight Ratio ◽  
Intraspecific Variability ◽  
Habitat Characteristics ◽  
Relative Growth Rates ◽  
The North ◽  
Eastern Australia ◽  
Different Temperatures ◽  
Net Assimilation

Five populations of the indigenous perennial grass Danthonia caespitosa Gaud. were selected from widely separated sites along a north-south transect in south-eastern Australia. The sites, spanning the latitudinal range (31° to 42° S.) for the species, extended from a hot semiarid environment in the north to a cool and moist temperate environment in the south. Two experiments, to assess the extent of intraspecific variability in response to different tempera- ture regimes, were conducted in naturally lit temperature-controlled glasshouses in the Ceres phyto- tron. All populations had a similar temperature optimum for growth of between 20.7 and 267°C (mean daily temperature), typical for temperate species. Rates of tillering, rates of leaf appearance, and leaf blade lengths and widths differed among populations and showed considerable phenotypic plasticity with respect to temperature. At all temperatures the growth rate of populations generally declined with increasing latitude of origin. A detailed analysis of growth rates showed that differences between populations in final weight could largely be accounted for by variability in mean relative growth rates. Northern populations in general had a higher net assimilation rate and leaf weight ratio than southern populations. The adaptive significance of these physiological and morphological differences between populations is discussed in relation to habitat characteristics and the distributional range of the species. It is concluded that along the latitudinal and climatic gradient there has been no significant change in temperature optima for growth but there has been natural selection resulting in higher growth rates of northern populations.

Effects of low temperature on growth parameters in the entomopathogenic fungus Metarhizium anisopliae

1999 ◽  
Vol 45 (12) ◽  
pp. 1055-1061 ◽  
Author(s):  
J N Amritha De Croos ◽  
Michael J Bidochka
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Metarhizium Anisopliae ◽  
Entomopathogenic Fungus ◽  
Incubation Temperature ◽  
Growth Parameters ◽  
Conidia Production ◽  
Cold Active ◽  
Germination And Growth ◽  
Cold Activity

The effects of temperature (8°C, 15°C, and 22°C) on germination, growth rate and conidia production in thirty-two isolates of the entomopathogenic fungus Metarhizium anisopliae were assessed. Most isolates were obtained from various locations in Ontario, Canada. Ten out of thirty-two (31.3%) isolates were deemed cold-active because of their ability to grow at 8°C. Growth rates in all isolates increased as the incubation temperature was increased. There were significant differences in growth rates and conidia production among isolates. However, conidia production had no relationship with a growth rate. With respect to the geographical origin, there was no general relationship between latitude and growth rates. However, we found that all the cold-active isolates were isolated from the more northern sites and no isolate originating below 43.5° latitude showed cold activity. Cold-active germination and growth of this biocontrol fungus have implications for strain selection and application in Canadian insect control efforts.Key words: Metarhizium anisopliae, cold activity, entomopathogen.

scholarly journals Effect of temperature on conidial germination and growth of the fungus Discosporium populeum (Sacc) Sutton

2004 ◽  
pp. 127-145 ◽  
Author(s):  
Nenad Keca ◽  
Dragan Karadzic
Keyword(s):  
Germ Tube ◽  
Ecological Factors ◽  
Conidial Germination ◽  
Tube Growth ◽  
Effect Of Temperature ◽  
Study Results ◽  
Different Temperatures ◽  
Long Time ◽  
Poplar Plantations ◽  
Germination And Growth

Dothichiza, poplar canker, due to its significance in the establishment of intensive poplar plantations, has been drawing attention for already a long time. The aim of the test was to study some of the most important physiological characteristics of the fungus, such as conidial germination germ tube growth and growth of mycelium at different temperatures on the isolates from north Potisje and to compare the study results with the domestic and foreign literature sources. The aim of this study was not to identify the different lower systematic categories, but to identify the differences between individual isolates - populations, depending on the most significant ecological factors, such as temperature.

Growth of seedlings of prairie grass and tall fescue in small swards of kikuyu at different temperatures

1985 ◽  
Vol 36 (2) ◽  
pp. 213 ◽  
Author(s):  
MJ Hill ◽  
CJ Pearson ◽  
LC Campbell
Keyword(s):  
Tall Fescue ◽  
Growth Rates ◽  
Festuca Arundinacea ◽  
Perennial Grasses ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Temperature Regimes ◽  
Prairie Grass ◽  
Different Temperatures ◽  
Grass Sward

Seeds of prairie grass (Bromus catharticus Vahl) and tall fescue (Festuca arundinacea Schreb.) were planted in established small swards of kikuyu (Pennisetum clandestinum Hochst ex Chiov.). Growth of the temperate seedlings and the subtropical grass sward was measured over a period of 59 days under four temperature regimes from 14/6 to 23/20�C (12/12 h). The capacity of the seedlings of the oversown temperate perennial grasses to establish in the sward of the subtropical kikuyu depended on temperature. At low temperature (mean daily temperature < 1l�C) the seedlings grew faster than the kikuyu and became successfully established. At moderate temperatures (11-19�C) the relative growth rates of seedlings were comparable with the relative growth rates of kikuyu tillers, but the latter dominated due to a greater absolute growth rate. Stature was an important component in the inter-species competition, and the taller prairie grass grew much better in competition with kikuyu than did fescue. Temperatures above 20�C exceeded the optimum of the seedlings of the temperate species but not that of kikuyu, so that the sown species were at a disadvantage and kikuyu dominated the mixture. It is concluded that prairie grass and tall fescue can be established successfully only in swards of kikuyu when day temperatures are below 21 and 15�C respectively, unless kikuyu is suppressed for a long period. A herbicide may be an economical means of doing this.

Sign in / Sign up

Export Citation Format

Share Document