Flower StructureFlower Structure

Jason GehrkeJason Gehrke

2014C, 2014D, 2022D2014C, 2014D, 2022D

4 Influential Factors4 Influential Factors

Plant HormonesPlant Hormones DaylengthDaylength NitrogenNitrogen TemperatureTemperature

Plant hormonesPlant hormones

http://waynesword.palomar.edu/trmar98.htmhttp://waynesword.palomar.edu/trmar98.htm

Trigger the Trigger the conversion of the conversion of the meristem from meristem from vegetative to floralvegetative to floral

Initiates formation of Initiates formation of new partsnew parts PetalsPetals SepalsSepals StamenStamen PistilsPistils

Complete/Incomplete FlowersComplete/Incomplete Flowers

Complete FlowersComplete Flowers Contain four principal Contain four principal

partsparts• SepalsSepals• PetalsPetals• StamenStamen• PistilPistil

Incomplete FlowersIncomplete Flowers Missing one of the four Missing one of the four

principal partsprincipal parts

DaylengthDaylength

http://waynesword.palomar.edu/trmar98.htmhttp://waynesword.palomar.edu/trmar98.htm

Length of night will Length of night will initiate floweringinitiate flowering

Two types of lengths Two types of lengths LongLong ShortShort

Long Day PlantsLong Day Plants

Plants flower with Plants flower with decrease in night decrease in night lengthlength

Days get longerDays get longer ExamplesExamples

WheatWheat OatsOats barleybarley

http://news.minnesota.publicradio.org/features/http://news.minnesota.publicradio.org/features/2003/04/24_gundersond_gmwheat/2003/04/24_gundersond_gmwheat/

Short Day PlantsShort Day Plants

Plants flower with Plants flower with increase in night increase in night lengthlength

Days get shorterDays get shorter ExamplesExamples

SoybeansSoybeans CornCorn SorghumSorghum

http://www.tiscali.co.uk/reference/encyclopaedia/http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0014425.htmlhutchinson/m0014425.html

Calendar of FloweringCalendar of Flowering

NitrogenNitrogen

Deficiency will cause Deficiency will cause poor flower formationpoor flower formation

TemperatureTemperature

High temperatures High temperatures will kill flowers (wilt)will kill flowers (wilt)

Cold temperatures Cold temperatures will also kill the will also kill the flowersflowers

http://www.wiretapestry.com/photoalbum/2-http://www.wiretapestry.com/photoalbum/2-1batch/deadflowers.jpg1batch/deadflowers.jpg

Flower StructureFlower Structure

Sepals- modified Sepals- modified leaves often green leaves often green and smalland small

Petals- large and Petals- large and colorful, aid in colorful, aid in attracting insects and attracting insects and other pollinatorsother pollinators

http://waynesword.palomar.edu/trmar98.htmhttp://waynesword.palomar.edu/trmar98.htm

Flower StructureFlower Structure

http://waynesword.palomar.edu/trmar98.htmhttp://waynesword.palomar.edu/trmar98.htm

Stamen- Male Stamen- Male reproductive organsreproductive organs Anther- produces pollenAnther- produces pollen Filament- stalk that holds Filament- stalk that holds

anther to floweranther to flower PistilPistil

Stigma- Sticky top of Stigma- Sticky top of pistil that receives pollenpistil that receives pollen

Style- tube connects Style- tube connects stigma to ovarystigma to ovary

Ovary base of the pistil, Ovary base of the pistil, holds the eggsholds the eggs

Corn Different from the NormCorn Different from the Norm

Tassel- male floral Tassel- male floral structure hold pollenstructure hold pollen

Ear- female floral structureEar- female floral structure Silt- elongated styles to Silt- elongated styles to

catch pollencatch pollen

Pictures to the right:Pictures to the right:

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

PollinationPollination

http://www.biologie.uni-hamburg.de/b-online/e02/02d.htmhttp://www.biologie.uni-hamburg.de/b-online/e02/02d.htm

Transfer of pollen from the anthers to the Transfer of pollen from the anthers to the stamenstamen

FertilizationFertilization

Union of the sperm and the eggUnion of the sperm and the egg Two sperm cellsTwo sperm cells

One to fertilize eggOne to fertilize egg One to fertilize embryoOne to fertilize embryo