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Flower Structure

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

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  1. Flower Structure Jason Gehrke 2014C, 2014D, 2022D

  2. 4 Influential Factors • Plant Hormones • Daylength • Nitrogen • Temperature

  3. 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

  4. Complete/Incomplete Flowers • Complete Flowers • Contain four principal parts • Sepals • Petals • Stamen • Pistil • Incomplete Flowers • Missing one of the four principal parts

  5. Daylength • http://waynesword.palomar.edu/trmar98.htm • Length of night will initiate flowering • Two types of lengths • Long • Short

  6. 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/

  7. 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

  8. Calendar of Flowering

  9. Nitrogen • Deficiency will cause poor flower formation

  10. Temperature • High temperatures will kill flowers (wilt) • Cold temperatures will also kill the flowers • http://www.wiretapestry.com/photoalbum/2-1batch/deadflowers.jpg

  11. 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

  12. 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

  13. 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

  14. Pollination • http://www.biologie.uni-hamburg.de/b-online/e02/02d.htm • Transfer of pollen from the anthers to the stamen

  15. Fertilization • Union of the sperm and the egg • Two sperm cells • One to fertilize egg • One to fertilize embryo

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