scholarly journals Effects of Temperature, Water Potential, and Light on Germination Responses of Redroot Pigweed Seeds to Ethylene

1980 ◽  
Vol 65 (6) ◽  
pp. 1149-1154 ◽  
Author(s):  
Mark W. Schonbeck ◽  
Grant H. Egley
Keyword(s):  
Water Potential ◽  
Redroot Pigweed ◽  
Effects Of Temperature ◽  
Temperature Water

Germination characteristics ofGymnocalycium monvillei(Cactaceae) along its entire altitudinal range

Botany ◽  
2017 ◽  
Vol 95 (4) ◽  
pp. 419-428 ◽  
Author(s):  
Karen Bauk ◽  
Joel Flores ◽  
Cecilia Ferrero ◽  
Reyes Pérez-Sánchez ◽  
M. Laura Las Peñas ◽  
...  
Keyword(s):  
Water Potential ◽  
The Other ◽  
Light Conditions ◽  
Altitudinal Distribution ◽  
Water Potentials ◽  
Germination Characteristics ◽  
Different Temperatures ◽  
Mean Germination Time ◽  
Effects Of Temperature ◽  
Temperature Water

Germination characteristics are important for understanding how species cope with environmental variation. The aims of this work were to analyze the effect of different temperatures (25 and 32 °C), water potentials (0, −0.2, −0.4, and −0.6 MPa), and light conditions (light vs. darkness) on the germination of five populations of the cactus Gymnocalycium monvillei (Lem.) Britton & Rose along its entire altitudinal distribution. The experiments to assess the effects of temperature, water potential, and light conditions were performed in germination chambers, and total germination (%) and mean germination time (T50) were recorded. Germination decreased in provenances from higher to lower altitudes, and the effect was very pronounced at temperatures of 32 °C. For all of the altitudinal provenances, germination decreased with lower water potential, with this effect being more pronounced at 32 °C. On the other hand, provenances at lower altitudes were less affected by lower water potentials than higher provenances. Provenances at all altitudes showed very low germination under dark conditions. T50did not vary among altitudinal provenances at a temperature of 25 °C, but at 32 °C germination was slower at intermediate altitudes. Our results show that germination characteristics differ considerably among altitudinal provenances and seem to be important in determining the capacity of the species to inhabit such a broad gradient.

Effects of Temperature and Competition on the Establishment and Growth of Redroot Pigweed and Common Lambsquarters 1

Crop Science ◽  
1978 ◽  
Vol 18 (2) ◽  
pp. 308-310 ◽  
Author(s):  
Chang‐chi Chu ◽  
Pamela M. Ludford ◽  
Jim L. Ozbun ◽  
Robert D. Sweet
Keyword(s):  
Common Lambsquarters ◽  
Redroot Pigweed ◽  
Effects Of Temperature

Effects of temperature, water content and nitrogen fertilisation on emissions of nitrous oxide by soils

1998 ◽  
Vol 32 (19) ◽  
pp. 3301-3309 ◽  
Author(s):  
K.A Smith ◽  
P.E Thomson ◽  
H Clayton ◽  
I.P Mctaggart ◽  
F Conen
Keyword(s):  
Nitrous Oxide ◽  
Water Content ◽  
Nitrogen Fertilisation ◽  
Effects Of Temperature ◽  
Temperature Water

The Self-Decay Characteristics of Chlorine Dioxide in Water

2012 ◽  
Vol 610-613 ◽  
pp. 296-299
Author(s):  
Xin Jie Li ◽  
Dan Nan Jiang ◽  
Yue Jun Zhang
Keyword(s):  
Rate Constants ◽  
Tap Water ◽  
Pure Water ◽  
Decay Behaviour ◽  
Increase With Increase ◽  
Higher Temperature ◽  
Effects Of Temperature ◽  
Lower Temperature ◽  
Kinetics Of ◽  
Temperature Water

In order to learn the ClO2 decay behaviour in tap water, the kinetics of ClO2 decay in pure water was studied. Under the conditions of tap water treatment and keeping away from light, the effects of temperature and pH on ClO2 degradation were investigated. The results show that the ClO2 decay reaction in pure water is the first-order with respect to ClO2, the decay rate constants increase with increase in temperature or pH. At pH=6.87, the rate constants are 0.012h-1(15°C), 0.017h-1(25°C), 0.023h-1(35°C), and 0.029h-1(45°C), respectively. At 25°C, the rate constants are 0.0083h-1(pH=4.5), 0.0111h-1(pH=5.5), 0.0143h-1(pH=6.5), 0.0222h-1(pH=7.5), and 0.0351h-1(pH=8.5), respectively. The experimental data prove that ClO2 is more stable in acidic or lower temperature water than in neutral, alkalescent, or higher temperature water.

Effect of Corn-Induced Shading and Temperature on Rate of Leaf Appearance in Redroot Pigweed (Amaranthus retroflexus L.)

Weed Science ◽  
1993 ◽  
Vol 41 (4) ◽  
pp. 590-593 ◽  
Author(s):  
Stephane M. Mclachlan ◽  
Clarence J. Swanton ◽  
Stephan F. Weise ◽  
Matthijs Tollenaar
Keyword(s):  
Field Experiments ◽  
Linear Increase ◽  
Amaranthus Retroflexus ◽  
Planting Date ◽  
Weed Interference ◽  
Redroot Pigweed ◽  
Field Temperature ◽  
Effects Of Temperature ◽  
Leaf Appearance ◽  
Rate Of Leaf Appearance

Leaf development and expansion are important factors in determining the outcome of crop-weed interference. The comparative effects of temperature and corn canopy-induced shading on the rate of leaf appearance (RLA) of redroot pigweed were quantified in this study. Growth cabinet results indicated a linear increase in RLA with increased temperature. Weed RLA was predicted utilizing both this function and field temperature data. The ratio of observed to predicted RLA of redroot pigweed grown in field experiments decreased in 1990 and 1991 as shading increased with increased corn density and delayed weed planting date. Results indicated that RLA is substantially affected by canopy-induced shading in addition to temperature.

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