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The effect of temperature on radish seed germination - Coggle Diagram
The effect of temperature on radish seed germination
Impact 3: Enzymes
The rate of germination and enzyme activity increases with warmer temperatures until a point.
The rate of cellular respiration increases with temperature
Generally temperatures above 30 and below 5 generate dormancy in a seed and potential damage enzymes.
How it can be tested
Temperatures higher than room temp
Heated mats
Heating lamps
Temperatures lower than room temp
Placed in the fridge
The freezer
Cold water bath
Environment
Cold
Dry
Dark
Surrounding the seed
Many cotton balls for high insulation of inside temperature
use of beaker for depth and to ensure placement of many cotton balls
use of gladwrap to seal environment and trap temperature
using a thermometer to observe temperature
Duration
Radish seeds require 5-10 days to germinate
What is being measured?
Number of germinated seeds
What is being changed
Temperatures
5(℃)
10(℃)
15(℃)
20(℃)
25(℃)
30(℃)
35(℃)
Impact 2: Moisture
Hotter temperatures can increase evaporation and dry out surrounding soil and conditions resulting in less water availability which can negatively impact the process of imbibition.
Impact 1: Hormones
Two types of hormones involved in germination
Gibberellins
Gibberellins increase the growth potential of the embryo and induces and activates enzymes required to break down lipids, proteins and carbohydrates into simple forms of energy available for use.
Released more rapidly in colder conditions
Abscisic Acid
Promotes dormacy
Higher temperatures stimulate ABA synthesis