Reproductive Processes - Pogonatum Flashcards
Describe the pogonatum gametophyte
Gametophyte is dominant plant, larger, and longer living than sporophyte
Gametophyte is photosynthetic
“Stem”, “Leaves” and rhizoids are present in the gametophyte
Gametophytes are dioecious (unisexual) Mature male gametophytes produce antheridia where several sperms are produced
Female gametophytes produce archegonia. A single egg is produced in an archegonium
The egg isn’t released
Flagellated, motile sperms swim through external water towards egg, entering the archegonium as a response to chemical attractants
Sperm fuses w the egg producing a diploid zygote. This occurs in the archegonium
Explain fertilization in gametophyte
Gametophytes are dioecious (unisexual) Mature male gametophytes produce antheridia where several sperms are produced
Female gametophytes produce archegonia. A single egg is produced in an archegonium
The egg isn’t released
Flagellated, motile sperms swim through external water towards egg, entering the archegonium as a response to chemical attractants
Sperm fuses w the egg producing a diploid zygote. This occurs in the archegonium
Explain sporophyte generation of pogonatum
After fertilization, zygote develops into embryo.
Embryo is also retained within the archegonium and develops into the diploid sporophyte by obtaining nutrients from gametophyte
The sporophyte remains attached to the gametophyte
The sporophyte consists of a foot, seta and capsule (sporangium)
The foot absorbs nutrients and water from gametophyte
Capsule produces spores by meoisis. Homosporous
If spores are dispersed to a favorable habitat (such as moist soil or tree bark) they may germinate and grow into a green branched filament called protonema
Protenema produces buds that grow into gametophytes
Function of sporophyte’s foot
Absorbing water and nutrients from gametophyte
Function of capsule in sporophyte
Produces spores by meiosis
Sporophyte consists of
Foot
Seta
Capsule (Sporangium)
