PLANT HORMONES

DATE: Monday, January 11, 2016

TIME: 12:30 PM

WEATHER CONDITIONS: At the time of observation, it was approximately 40.6˚F outside. There was a 0% chance of precipitation throughout the day, and it the sky was a clear blue with a few puffy, clouds. There was 30.18 in. of atmospheric pressure. The average humidity was 64%. The wind speed at the exact time of observation was 0.9 mph.  

CHANGES: The tree remains barren and lifeless. There are a few lone brown, crumpled leaves scattered among a few of the branches. There is nothing scattered around the base of the trunk.

HORMONE SIGNALING:
The hormone is signaled to be produced, and travels through the bloodstream until it is received by a specific target. The signaling molecule (the hormone) can only bind to a certain receptor. The received hormone signal is amplified through the signal transduction process, and its cellular response is released throughout the cell.

SECOND MESSENGERS:
Second messengers, such as cGMP and Ca2+ are the molecules that relay the signal from the receptor to the target cell.

TYPES OF PLANT RESPONSES:

1. Geotropism: the plant's growth response to gravity; plant stems grow up and the roots grow up

2. Phototropism: the plant's growth in response to light; it will either bend towards the light or away from it

3. Photoperiodism: the plant's growth response to the changing photoperiod, or the changes in the lengths between day and night that occurs when the seasons change. This determines the length of the plant. 

PLANT HORMONE HORMONES AND THEIR RESPONSES:

1. Auxins: regulates plant growth by causing the elongation of cells 

2. Gibberellins: another growth-promoting hormone that also deals with seed germination and leaf expansion

3. Cytokinins: associated with many plant activities such as mitosis and chloroplast development

4. Abscisic acid: helps the plant adapt to stress

5. Ethylene: encourages the ripening of fruits, opening of flowers, and shedding of leaves off of plants

RESOURCES:

• http://www.wunderground.com/personal-weather-station/dashboard?ID=KNCMOORE24&scrollTo=historyTable#history
• https://en.wikibooks.org/wiki/Structural_Biochemistry/Cell_Signaling_Pathways/Hormonal_Signaling
• http://www.thefreedictionary.com/geotropism
• http://www.scienceclarified.com/Oi-Ph/Phototropism.html