Ch. 38 Angiosperm Reproduction-spring 2012

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Ch. 38 Angiosperm Reproduction-spring 2012 Powered By Docstoc
					Angiosperm Reproduction
Figure 38.0 Agave (century plant)
Figure 38.2 Review of an idealized flower




                                            Perfect
                                            Vs.

                                            Imperfect
dioecious species     Maize, a monoecious   species




                         On same plant
 On different plant
?
 Alt. of Genereations
    (angiosperms)
               (++ cell)

(1 cell)

                           (1 cell)




              (++ cell)
           • Embryo sac (n) (♀) contains egg
           • Pollen (n) (♂) contains sperm
                          (++ cell)

(1 cell)

                                      (1 cell)




                          (++ cell)


                          • Adult plant
                            (2n)
Figure 30.17 The life cycle of an angiosperm
Fig. 30-10-4
               Key
               Haploid (n)
               Diploid (2n)                                    Microsporangium
                                        Anther
                  Mature flower on                              Microsporocytes (2n)
                  sporophyte plant
                  (2n)                                             MEIOSIS

                                                                                       Generative cell
                                                            Ovule (2n) Microspore       Tube cell
                                                                       (n)
                                                                       Male gametophyte
                                                    Ovary              (in pollen grain) Pollen
           Germinating                                      MEIOSIS    (n)               grains
                                                                               Stigma
           seed                                  Megasporangium
                                                 (2n)                          Pollen
                                                                               tube
                                Embryo (2n)
                                Endosperm (3n)                                 Sperm
                                               Seed                Megaspore
                                Seed coat (2n)                     (n)
                                                                               Style
                                                 Antipodal cells
                              Female gametophyte Central cell
                              (embryo sac)                            Pollen
                                                 Synergids            tube
                                                 Egg (n)            Sperm
               Nucleus of
               developing                                           (n)
               endosperm
               (3n)              FERTILIZATION

                       Zygote (2n)
                                      Egg
                                      nucleus (n)       Discharged sperm nuclei (n)
Figure 38.1 Simplified overview of angiosperm life cycle
Figure 38.2 Review of an idealized flower
Pollen (n)
Embryo sac (n)
Figure 30.18 Flower-pollinator relationships: Scottish broom flower and honeybee
        (left), hummingbird (top right), baobab tree and bat (bottom right)
Figure 38.2 Review of an idealized flower
Figure 38.3a Trillium
Figure 38.3ax1 Lily
Figure 38.3ax2 Lily
Figure 38.3b Lupines
Figure 38.3bx1 Foxglove
Figure 38.3bx2 Broom
Figure 38.3c1 Sunflower
Figure 38.3c2 Pyrethrum, a composite flower
Figure 38.3d2 Aloe
Maize, a monoecious   species
Figure 38.3ex Begonia, a monoecious species
Figure 38.3f Sagittaria: staminate flowers (left), carpellate flowers (right)
Figure 38.3d1 Pollination modes
                                     Figure 38.3d1 Pollination modes- wind




                                                              ↑
                                                          Pollen “smoke”


http://i.pbase.com/g6/81/660481/2/81950680.tBT1X8De.jpg
Figure 30.18 Flower-pollinator relationships: Scottish broom flower and honeybee
        (left), hummingbird (top right), baobab tree and bat (bottom right)
Figure 38.4 The development of angiosperm gametophytes (pollen and embryo
                                  sacs)
                     Figure 38.5 Pollen grains have tough, ornate, and distinctive walls




Texas Parks and Wildlife Department
The development of angiosperm gametophytes pollen and embryo sacs)
pollen tube and
double fertilization
Barriers to Self Polination
       1
2 Flower Timing




http://www.bobklips.com/BOBS_WEBSITE/ILF-JUGLNIGRlab.jpg
3
    Flower Structures
Maize, a monoecious   species
“Pin” and “thrum” flower types reduce self-fertilization
Figure 38.3ax2 Lily
4 Self-incompatibility
The development of a dicot plant embryo/Seed
Figure 38.11 Seed structure
Fruit: e.g. pea fruit (pod)
Fig. 30-7

                               Stigma
                                               Carpel
            Stamen    Anther
                                       Style
                 Filament
                                         Ovary




              Petal
                                               Sepal


Fruit:                         Ovule


     (to be)
Fig. 30-8
              Tomato
                            Ruby grapefruit




            Nectarine




                                  Hazelnut




                 Milkweed
Seed Distribution:
                     Wings




                             Seeds within berries




Fig. 30-9
                             Barbs
Seed Distribution: in feces




           From http://www.scielo.br/img/revistas/mioc/v98s1/30p01.jpg
      Dormancy & Seed germination




Epigeous




    Hypogeous
2,000 year old seed Germinated!!
           (recovered from King Herod's palace)




Ancient date seeds of Masada, Israel                  Judean date palm, at 26 months


                                       From: http://www.4to40.com/newsat4/index.asp?id=1830&news=Resurrected_Judean_Date_Palm_Tree
Asexual/ vegetative reproductions: Kalanchoe (left), aspen (right)
     Apomixis
Seeds= clones of parent plant
       – without fertilization
END
Fig. 30-13b




              Water lily
Fig. 30-13c




              Star anise
Fig. 30-13d




              Southern magnolia
Fig. 30-13e




              Orchid
Fig. 30-13f




              Lily
Fig. 30-13g
                Barley




              Anther


                         Stigma

                         Ovary
              Filament
Fig. 30-13h




              California poppy
Fig. 30-13i




              Pyrenean oak
Fig. 30-13j




              Dog rose
Fig. 30-13k




              Snow pea
Fig. 30-13m
                Monocot                            Eudicot
              Characteristics                   Characteristics


                                   Embryos



               One cotyledon                     Two cotyledons


                                     Leaf
                                   venation




                Veins usually                     Veins usually
                   parallel                          netlike



                                    Stems



                                                 Vascular tissue
               Vascular tissue                  usually arranged
                 scattered                           in ring




                                    Roots




                Root system                    Taproot (main root)
               usually fibrous                   usually present
               (no main root)


                                    Pollen



              Pollen grain with                 Pollen grain with
                one opening                      three openings



                                   Flowers




               Floral organs                  Floral organs usually
                 usually in                      in multiples of
              multiples of three                   four or five
Figure 38.16 Test-tube cloning of carrots
Figure 38.17 A DNA gun
Figure 35.24 A summary of primary and secondary growth in a woody stem
Figure 38.18 Protoplasts
Figure 38.19 A product of artificial selection: Teosinte (left), maize (right)
Figure 38.20 Genetically engineered papaya
Figure 38.13 Mobilization of nutrients during the germination of a barley seed

				
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posted:8/26/2012
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