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Pascale Michelon

Plant hormone and growth regulators - 0 views

extension.oregonstate.edu/...hormones.html

plant hormones

shared by Pascale Michelon on 11 Apr 10 - Cached
  • (Table 5)
  • Hormones are produced naturally by plants, while plant growth regulators are applied to plants by humans
    • Pascale Michelon
      Pascale Michelon on 11 Apr 10
       
      This is interesting because it shows you that if you want to manipulate hormones in an experiment you can use plant growth regulators to mimic the action of hormones.
  • ...3 more annotations...
  • There are five groups of plant-growth-regulating compounds: auxin, gibberellin (GA), cytokinin, ethylene, and abscisic acid (ABA).
  • Ethylene is unique in that it is found only in the gaseous form. It
  • induces ripening, causes leaves to droop (epinasty) and drop (abscission), and promotes senescence.
    • Pascale Michelon
      Pascale Michelon on 11 Apr 10
       
      The effects of ethylene (promotion of both aging/death and ripening) may explain why just one bad apple in a basket may spoil the whole bunch.
  • Pascale Michelon on 11 Apr 10
     
    Plant hormones and growth regulators are chemicals that affect flowering; aging; root growth; killing of leaves; prevention or promotion of stem elongation; color enhancement of fruit; prevention of leafing and/or leaf fall; etc.
Earl Schultz

Essential Plant Nutrients - 1 views

www.cartage.org.lb/...EssentialPlant.htm

shared by Earl Schultz on 09 Apr 10 - Cached
  • Plants require 13 mineral nutrient elements for growth
  • Macronutrients (nitrogen, phosphorus, potassium, calcium, magnesium and sulfur) are plant nutrients required in the largest amount in plants. Micronutrients (iron, copper, manganese, zinc, boron, molybdenum and chlorine) are required in relatively smaller amounts. Additional mineral nutrient elements which are beneficial to plants but not necessarily essential include sodium, cobalt, vanadium, nickel, selenium, aluminum and silicon
    • bacoco coco
      bacoco coco on 09 Apr 10
       
      Nutrients (in the soid) are needed either in large amounts (macronutrients), medium amounts (micronutrients), or in trace amounts
  • ...6 more annotations...
  • Five types of deficiency or toxicity symptoms are observed:
    • bacoco coco
      bacoco coco on 09 Apr 10
       
      Here are the visible signs if the soil does not have enough of or too much of a nutrient.
    • bacoco coco
      bacoco coco on 09 Apr 10
       
      Plants can be damaged is there is too much of one nutrient (toxicity) or not enough of a nutrient (deficiency).
  • A nutrient deficiency occurs when the nutrient is not in sufficient quantity to meet the needs of the growing plant. Nutrient toxicity occurs when a plant nutrient is in excess and decreases plant growth or quality
  • Essential plant nutrients: their relative amounts in plants, functions and classification
    • bacoco coco
      bacoco coco on 09 Apr 10
       
      This table may be helpful in determining a topic for an experiment. You would only want to choose one nutrient with which to run an experiment.
  • Table 2. Generalized Symptoms of Plant Nutrient Deficiency or Excess
    • bacoco coco
      bacoco coco on 12 Apr 10
       
      This table will be very helpful as a visual aid for determining if your experiment is functioning properly. Remember, you can only experiment on one nutrient at a time.
  • Earl Schultz on 13 Apr 10
     
    This page deals with the nutrients required for plant survival and plant growth. As well as the substances which are hazardous to plant growth and what complications can arise when these complications occur.
Laura Bradford

AccessScience | Encyclopedia Article | Soil fertility - 1 views

www.accessscience.com/content.aspx

l bradford

shared by Laura Bradford on 09 Apr 10 - Cached
  • Sixteen chemical elements are required for the growth of all plants: carbon, oxygen, and hydrogen (these three are obtained from carbon dioxide and water), plus nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, manganese, zinc, copper, boron, molybdenum, and chlorine. Some plant species also require one or more of the elements cobalt, sodium, vanadium, and silicon.
  • 13 essential mineral nutrien
  • J. R. Brown (ed.), Recommended Chemical Soil Test Procedures for the North Central Region, Missouri Agricultural Experiment Station, Columbia, 1998
    • Laura Bradford
      Laura Bradford on 09 Apr 10
       
      The article highlighted is worth looking up. Contains information on experimental procedures and how to handle your soil samples.
  • Laura Bradford on 09 Apr 10
     
    Soil Fertility: How is this important to growth of a plant?
emily shy

The DoveSong Foundation -- The effect of Music on Plants (The Plant Experiments) - 0 views

www.dovesong.com/...plant_experiments.asp

dovesong foundation music plant growth rock classical

shared by emily shy on 13 Apr 10 - Cached
    • emily shy
      emily shy on 13 Apr 10
       
      The plants were actually trying to avoid the music because it stunts their growth! That is incredible!!!
  • with the same song played by strings, the plants bent towards the speaker.
    • emily shy
      emily shy on 13 Apr 10
       
      Strings as opposed to drums and steel percussion. It seems like that is more appealing to humans as well
  • ...6 more annotations...
  • The plants showed no reaction at all to country and western music
  • the plants "liked" the jazz that she played them
  • leaned 30 to 70 degrees away from the speakers
  • Her first experiment was to simply play a constant tone
  • The plants in the first chamber, with the constant tone, died within fourteen days.
  • In the chamber with the soothing music, the plants were growing healthily and their stems were starting to bend towards the radio! In the rock chamber, half the plants had small leaves and had grown gangly, while the others were stunted. After two weeks, the plants in the soothing-music chamber were uniform in size, lush and green, and were leaning between 15 and 20 degrees toward the radio. The plants in the rock chamber had grown extremely tall and were drooping, the blooms had faded and the stems were bending away from the radio.
emily shy

Does Music Affect Plant Growth? | eHow.com - 0 views

www.ehow.com/music-affect-plant-growth.html

interesting music plant growth

shared by emily shy on 13 Apr 10 - Cached
  • Plants do like noise. Plants exposed to a set frequency of sound tend to germinate more quickly, grow taller and weigh more than those kept in silence. Both 50,000 hz ultrasound (above the human hearing range) and 5,000 hz sound seem to work. Therefore, there's a good chance that plants like any sound you might play for them, including music.
  • Plants also like good, attentive care. If you are playing music you like for a plant, it may lead you to take better care of it. You will be more likely to carefully water and feed the plant and make sure it has good light. It might look like the music helps the plant grow, when you are actually taking better care of it. Plants like carbon dioxide. If you are standing by a plant, singing to it, it is going to absorb some carbon dioxide from your breath. This could help it to grow more quickly.
emily shy

What effect does music have on plant growth? - 0 views

www.miniscience.com/...index.html

music effect plant growth rock classical

shared by emily shy on 13 Apr 10 - Cached
  • The one that was in the best condition was the plant that was in the room with classical music. The second best plant was the one in the room with no music and the one that didn't do so good was the one in the room with rock music.
  • and Rap was last!
    • emily shy
      emily shy on 13 Apr 10
       
      Interesting. Maybe because of all the drum effects it would cause the plants to be unsettled?
  • emily shy on 13 Apr 10
     
    experiment on the effect of music on plants
Leah Thomas

GIC | Article on Bamboo - 0 views

find.galegroup.com/gic/retrieve.do?contentSet=IAC-Documents&sort=DateDescend&tabID=T002&searchId=R3&docId=A198667816&prodId=GIC&currentPosition=1&userGroupName=sain62671&resultListType=RESULT_LIST&sgHitCountType=None&qrySerId=Locale%28en%2C%2C%29%3

shared by Leah Thomas on 13 Apr 10 - No Cached
  • Leah Thomas on 13 Apr 10
     
    Because bamboo is a sustainable option vs regular tree wood, I'm interested in what conditions (nutritional or environmental) would better improve the growth. This article gives statistics and extra information about bamboo
emily shy

WikiAnswers - What are the effects of music on plants - 0 views

wiki.answers.com/...nd_it%27s_effect_on_the_plants

music plant growth

shared by emily shy on 13 Apr 10 - Cached
  • it needs to be limited to three hours a day, rather than played continuously.
  • Effective experiments, however, would need to involve the following factors:
  • Music
  • ...8 more annotations...
  • classical music
  • 33-85 degrees away from the CD Player.
  • The one that didn't do so well was the one in the room with rock music. It grew from the range of
  • The effect of music on plants is drastic
    • emily shy
      emily shy on 13 Apr 10
       
      From no effect to drastic. These results are pretty varied.
  • the high frequency of mechanical waves that run hand in hand with rap and acid rock are damaging to the plant.
  • Plants have no auditory organs. They can't hear any more than you could hear through your skin if you had no ears.
    • emily shy
      emily shy on 13 Apr 10
       
      Just as deaf people can feel vibrations, I would assume that plants can feel the vibration of the music. Either gentle music or jarring music
Mason Medart

Are Electrolytes Good For Plants - 0 views

www.jstor.org/81410

mason medart

shared by Mason Medart on 13 Apr 10 - No Cached
  • Mason Medart on 13 Apr 10
     
    certain electrolytes allow nutrients to move through the plant cell membrane, possibly allowing for quicker growth which could be essential for a plants survival if it needs to grow faster than a weed or something harmful to it.
Sarah Tolch

AccessScience | Research Update | Phototropin - 1 views

www.accessscience.com/content.aspx

shared by Sarah Tolch on 09 Apr 10 - Cached
  • Typically, stems show positive phototropism (movement toward the light), whereas roots exhibit negative phototropic movement (away from the source of light).
  • Arabidopsis contains two phototropins referred to as phot1 and phot2. Mutants of Arabidopsis lacking both phototropins lose their phototropic responsiveness
  • Phototropic response
  • ...10 more annotations...
  • phototropins control the movement of chloroplasts
  • these responses serve to enhance the photosynthetic
  • Phototropins, like photoreceptor pigments associated with mammalian vision, comprise many amino acids (900–1000) that form the main structure of the protein (the apoprotein) to which an accessory chemical cofactor is bound that can absorb light and impart color (the chromophore)
  • a small fraction of the receptor pool is rapidly internalized (within minutes) upon blue light irradiation
  • Phototropins are typically associated with the plasma membrane
  • However, the biological significance
  • As light passes through the stem, it becomes progressively diffracted, thereby generating a gradient of phototropin activation across the organ, with the highest level of activity occurring on the irradiated side
  • In some plant species, including the fern Adiantum capillus-veneris, phototropism and chloroplast movement are induced by red light as well as blue.
  • novel
  • The presence of such a hybrid photoreceptor is proposed to enhance light sensitivity and aid the prevalence of species such as ferns in low light conditions
Judi Crouch

Hypoxia in the Northern Gulf of Mexico - 2 views

www.gulfhypoxia.net/Overview

Crouch

shared by Judi Crouch on 12 Apr 10 - Cached
  • Hypoxia, or oxygen depletion, is an environmental phenomenon where the concentration of dissolved oxygen in the water column decreases to a level that can no longer support living aquatic organisms.
  • Hypoxic and anoxic (no oxygen) waters have existed throughout geologic time, but their occurrence in shallow coastal and estuarine areas appears to be increasing as a result of human activities (Diaz and Rosenberg, 1995). The largest hypoxic zone currently affecting the United States, and the second largest hypoxic zone worldwide, occurs in the northern Gulf of Mexico adjacent to the Mississippi River on the Louisiana/Texas continental shelf.
  • What causes hypoxia? Major events leading to the formation of hypoxia in the Gulf of Mexico include: Freshwater discharge and nutrient loading of the Mississippi River Nutrient-enhanced primary production, or eutrophication Decomposition of biomass by bacteria on the ocean floor Depletion of oxygen due to stratification
  • ...5 more annotations...
  • Mississippi River nutrient concentrations and loading to the adjacent continental shelf have greatly changed in the last half of the 20th century. During this time there has been a marked increase in the concentration of nitrogen and phosphorous in the Lower Mississippi River. This increase has been attributed to the increased use of nitrogen and phosphorous fertilizers,
  • Eutrophication
  • eutrophication initiates a massive growth of phytoplankton on the water’s surface.
  • This stratification leaves the bottom layer isolated from the surface layer and cut off from a normal resupply of oxygen from the atmosphere.
  • Hypoxia was first documented in the northern Gulf of Mexico off the Louisiana coast in 1972.
  • Judi Crouch on 12 Apr 10
     
    Good intro to the concept of "dead zones" (hypoxia)
  • Judi Crouch on 12 Apr 10
     
    This is a good introduction to the concept of a "dead zone."
  • Judi Crouch on 12 Apr 10
     
    What does anthropogenically mean?
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