Class Notes (838,375)
Canada (510,867)
Biology (641)
BIOL 3050 (22)
Lecture

Developmental Biology - Section 2

29 Pages
57 Views
Unlock Document

Department
Biology
Course
BIOL 3050
Professor
Margaret Cooper
Semester
Winter

Description
08092014001100Lecture163102014PollinationSelfincompatibilityPollinationoPollenadhesionoPollencoatfootformationandpollenhydrationoPollentubeemergenceoPollentubeinvasionofthepapillaecellwallandextensiontowardsthestylePollinationvsIncompatiblePollinationoAgeneticcheckpointfortherejectionofselfpollenoPollengerminationonlyoccursonacompatiblestigmaoIncompatibilitypromotescrosspollinationoutcrossingTypesofselfincompatibilityoGametophyticincompatibilityIncompatiblepollenisallowedtogerminatepollentubeformsandthensomethinghappenstostopthegrowthofthepollentubesoitneverreachestheovuleoSporophyticincompatibilityIncompatablepollenisnotallowedtogerminatepollentubeneverformssothepollengraincannotgerminateProteinubiquinationoAdditionofoneormoreubiquitinmoleculesBothformsofincompatibilityhavearoleplayedbyproteinubiquinationSometimesittargetsasubstratewhichcausesdegradationofthesubstrateorsomethingotherthandegradationoftheproteinhappensoInsporophticthereisaligandfromthepollenthatishaplotypespecificItcommunicateswiththecellwallitinsidesecretoryvesiclethereareproteinsbutbecauseofthereceptionfromanincompatibleligandwehaveoIngametophyticpollentubehasstartedtoformTransmittingtissuesurroundspollentubeHaplotypespecificRNAaseWhenanincompatibleoneenterspollentubeitscytotoxicThatcausesdegradationofthepollentubesoitcannolongerproceedIfwehaveRNAasefromtissuethatiscompatiblethecompatibleRNAasearebrokendownubiquinatedandtargetedtotheproteasomeandnotabletoproducethecytotoxicLecture173122014FertilizationDoublefertilizationoSpermcelleggcellzygoteoSpermcellcentralcelltwopolarnucleitriploidendospermoRemainingcellsoftheembryosacdegenerateoWhenthepollentubearrivesattheembryosacitrupturesallowingthespermcellstoreleasewhichfertilizetheeggcellandtheotherspermcellfertilizesthecentralcellPollenTubeGrowthoPollengerminatesandtubeelongatesoPollentubepenetratesthecuticleandcellwallofpapillarcelloTubegrowsdownthetransmittingtractseptumoTubeemergesfromthetransmittingtractnearfuniculusoTubegrowsalongfurniculusandentersovulethroughmicropylePollentubeguidanceoPollentubegrowthinvolvesattractionandguidancemechanismsactingalongtheapicalbasalaxisandalonglateralaxestowardovulesTransmittingtissueprovidesnutrientsupportandchemicalgradientsorguidancecuesforpollentubegrowthOvulealsoprovidesguidancecuesNTTmutantAproperlydevelopedtractisrequiredfortubegrowthItisexpressedthroughoutthetransmittingtractaswellasinthefuniculusIfitisnotpresenttherewillbeanabnormaltractInthemutantsthepollentubesgrowmuchmoreslowlyandexitthetractearly
More Less

Related notes for BIOL 3050

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit