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Reproduction and Senescence
•Katerina Dadakova, Department of Biochemistry
•Figures adopted from Buchanan et al., Biochemistry & molecular biology of plants

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The life cycle of flowering plants

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The transition to reproductive development

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Flower development

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Male gametes

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Female gametes
(A) Megaspore mother cell at the tip of a young ovule primordium
(B) Functional megaspore initiates embryo sac development
(C) Mature ovule containing synergid cells, egg cell, central cell, and antipodal cells

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Pollination and fertilization
Genetic basis of self-incompatibility

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Pollination and fertilization
Growing pollen tube

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Seed development

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Senescence
Ipomoea tricolor
Welwitschia mirabilis

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Senescence

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Gene expression during senescence
Groups of genes upregulated in senescing leaves and petals

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Salvage of nutrients
Nucleic acids
Phosphate export

Mitochondrion
TCA cycle
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Energy and metabolism

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Pigment metabolism in senescence
Chromoplast
Chloroplast
Gerontoplast

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Environmental influences of senescence
Cellular events during autumnal senescence in aspen

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Programmed cell death
AB, autophagic body
AP, autophagosome

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Programmed cell death

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Programmed cell death
The differentiation of tracheary elements

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Environmental influences of PCD
Cell death during the HR