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Flower Structure. Jason Gehrke 2014C, 2014D, 2022D. 4 Influential Factors. Plant Hormones Daylength Nitrogen Temperature. Plant hormones. http://waynesword.palomar.edu/trmar98.htm. Trigger the conversion of the meristem from vegetative to floral Initiates formation of new parts Petals

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flower structure

Flower Structure

Jason Gehrke

2014C, 2014D, 2022D

4 influential factors
4 Influential Factors
  • Plant Hormones
  • Daylength
  • Nitrogen
  • Temperature
plant hormones
Plant hormones
  • http://waynesword.palomar.edu/trmar98.htm
  • Trigger the conversion of the meristem from vegetative to floral
  • Initiates formation of new parts
    • Petals
    • Sepals
    • Stamen
    • Pistils
complete incomplete flowers
Complete/Incomplete Flowers
  • Complete Flowers
    • Contain four principal parts
      • Sepals
      • Petals
      • Stamen
      • Pistil
  • Incomplete Flowers
    • Missing one of the four principal parts
daylength
Daylength
  • http://waynesword.palomar.edu/trmar98.htm
  • Length of night will initiate flowering
  • Two types of lengths
    • Long
    • Short
long day plants
Long Day Plants
  • Plants flower with decrease in night length
  • Days get longer
  • Examples
    • Wheat
    • Oats
    • barley
  • http://news.minnesota.publicradio.org/features/2003/04/24_gundersond_gmwheat/
short day plants
Short Day Plants
  • Plants flower with increase in night length
  • Days get shorter
  • Examples
    • Soybeans
    • Corn
    • Sorghum
  • http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0014425.html
nitrogen
Nitrogen
  • Deficiency will cause poor flower formation
temperature
Temperature
  • High temperatures will kill flowers (wilt)
  • Cold temperatures will also kill the flowers
  • http://www.wiretapestry.com/photoalbum/2-1batch/deadflowers.jpg
flower structure11
Flower Structure
  • Sepals- modified leaves often green and small
  • Petals- large and colorful, aid in attracting insects and other pollinators
  • http://waynesword.palomar.edu/trmar98.htm
flower structure12
Flower Structure
  • http://waynesword.palomar.edu/trmar98.htm
  • Stamen- Male reproductive organs
    • Anther- produces pollen
    • Filament- stalk that holds anther to flower
  • Pistil
    • Stigma- Sticky top of pistil that receives pollen
    • Style- tube connects stigma to ovary
    • Ovary base of the pistil, holds the eggs
corn different from the norm
Corn Different from the Norm
  • Tassel- male floral structure hold pollen
  • Ear- female floral structure
  • Silt- elongated styles to catch pollen

Pictures to the right:

http://www.hort.purdue.edu/ext/senior/vegetabl/corn3.htm

pollination
Pollination
  • http://www.biologie.uni-hamburg.de/b-online/e02/02d.htm
  • Transfer of pollen from the anthers to the stamen
fertilization
Fertilization
  • Union of the sperm and the egg
  • Two sperm cells
    • One to fertilize egg
    • One to fertilize embryo