Background Introduction By Bensen Fan Kristin Gill Maria Garcia.
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Transcript of Background Introduction By Bensen Fan Kristin Gill Maria Garcia.
Background Introduction
By Bensen Fan Kristin Gill
Maria Garcia
Part I. Seed Development
By Bensen Fan
Seed Anatomy
Cotyledon
Axis
Flower Anatomy
Pistil
Anthers(Makes Pollens)
Ovary(Contains ovules)
Stigma
Pollination & Fertilization: Forming of a New Life!
Sperms
PollenTube
Embryo Development: Zygote - Young Embryo
Asymmetric Division
Apical Cell
Basal Cell
Embryo Proper
Suspensor
Terminally Differentiated
Late Development: Torpedo - Mature Embryo
SM = Shoot Meristem; RM = Root Meristem
Final Stage: Dormancy
Mature Seeds Dormant Seeds
Germination: Beginning of a New Cycle…
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Part II. Arabidopsis thaliana Embryo
Development
By Kristin Grill
What is the life cycle of an Arabidopsis plant?
What happens during embryo development?
Each stage is essential for embryo development!
EMBRYO SAC GLOBULAR
HEART
TORPEDO
MATURATION
Embryos develop after double fertilization
Early embryos consist of 2 regions:
1. Embryo Proper
2. Suspensor
Globular Embryo
Embryo Proper
Suspensor
Early embryo development is a very coordinated developmental process
Embryo Sac
Egg Cell
Central Cell
Synergids
2-Cell Embryo
Apicalcell
Basalcell
Globular Embryo
Embryo Proper
Suspensor
The parts of a globular embryo undergo different fates
Globular Embryo
Embryo Proper
SuspensorMature Embryo
DifferentiatedOrgan
Mature Arabidopsis
Plant
Late embryo development…
consists of cotyledon and axis development!
2 cotyledons
Heart Stage
Torpedo Stage
Mature Embryo
Consists of:
1.Cotyledons
2.Axis - contains the shoot
and root meristems
Part III: Why is Arabidopsis Thaliana a model plant?
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By Maria Garcia
Here’s Why
Arabidopsis Thaliana is convenient. It has a:
Fast generation timeSmall genomeLarge mutant collectionsLarge scientific community working on all aspects of plant biology
How fast does it grow?Short non-seasonal generation time
Grows all year
4 to 8 weeks from a seed to a mature plant
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How small is it?
Arabidopsis has a small genome
120Mb (25,000 genes- same as humans!)
Arabidopsis genome was sequenced in the year 2000
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Easy to Manipulate
Large mutant collections
ChemicalInsertional
Knock-Out!
Easily manipulatedGenetically tractable
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Everyone is in on it
Large scientific community working on all aspects of plant biology
Many resources on this plant alreadyMuch is already known about this plant
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