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Introduction of Seed Development and Arabidopsis Embryo Development. By Bekah Charney and Thi Nguyen HC70AL Spring 2006. What is the life cycle of an Arabidopsis Plant?. 2n Adult Sporophyte. 2n Adult Sporophyte. Meiosis. Meiosis. Many mitosis. Many mitosis. n n n n

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introduction of seed development and arabidopsis embryo development

Introduction of Seed Development and Arabidopsis Embryo Development

By Bekah Charney and Thi Nguyen

HC70AL Spring 2006

slide2

What is the life cycle of an Arabidopsis Plant?

2n

Adult

Sporophyte

2n

Adult

Sporophyte

Meiosis

Meiosis

Many mitosis

Many mitosis

n n n n

Haploid spores

n n n n

Haploid spores

n Adult Gametophyte

n Adult Gametophyte

Mitosis

Mitosis

n Gametes

n Gametes

2n Zygote

2n Zygote

Many Mitosis

Many Mitosis

2n

Adult

Sporophyte

2n

Adult

Sporophyte

slide5

Embryo Development

EMBRYO SAC

GLOBULAR

HEART

TORPEDO

MATURATION

slide6

Globular Stage

  • Stage which precedes cotyledon development
  • Embryo proper is spherical
  • Note the suspensor
slide7

Heart Stage

  • Globular embryo develops into two-lobed form
  • Suspensor acts as an “umbilical cord,” providing nutrients to the embryo.
torpedo stage
Torpedo Stage
  • Cotyledons and axis grow longer
  • Embryo may remain straight or become curved
mature embryo
Mature Embryo
  • Cotyledons curve and provides nutrition to plant, enough to get plant started with photosynthesis
  • Suspensor disappears
  • Endosperm has been used for nutrients and now is used up
mutations that are lethal

A

A

a

a

A

A

Aa

Aa

AA

AA

a

a

Aa

Aa

aa

aa

Mutations that are Lethal

Lethal to Zygote

Lethal to Gamete

Phenotype: live to dead seeds

3:1

Genotype: AA to Aa

1:2

Phenotype: live to dead seeds

1:1

Genotype: AA to Aa

1:1

acknowledgements
Acknowledgements
  • We would like to thank Ria, Jon, XingJun and Tomo for allowing us to use their Nomarski photographs and their assistance in general in helping to make to this presentation
  • We would also like to thank Mike, Brandon, Jessica, the rest of the HC70AL class and Dr. Goldberg for being there for us all quarter!