A Brief Overview of Plant Development

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A Brief Overview of Plant Development
BIOL 370 Developmental Biology Topic 5

• Lange

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Please note that these PowerPoint lectures are
based upon material in the 8th edition of the
Gilbert textbook. The chapter is no longer
included in more recent editions of the textbook.
However, as the topic is of importance, we are
covering aspects of it in our class. As the 8th
edition is no longer in print, the chapter
(labeled Chapter 20 as it was referred to in
the 8th edition) can be found as a .pdf on our
website if you would like to read the chapter
upon which this lecture is based.
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Plants have haplodiplontic life cycles that
involve mitotic divisions in both the haploid and
diploid generations
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Life cycle of an angiosperm, represented here by
a pea plant (genus Pisum) (Part 1)
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Life cycle of an angiosperm, represented here by
a pea plant (genus Pisum) (Part 2)
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(A) Pollen grains have intricate surface patterns
(B) A pollen grain consists of a cell within a
cell
The mature pollen-grain has a double wall, a thin
delicate wall of unaltered cellulose (the
endospore or intine) and a tough outer
cuticularized exospore or exine. The exine often
bears spines or warts, or is variously
sculptured, and the character of the markings is
often of value for identifying genus, species.
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The carpel consists of the stigma, the style, and
an ovary containing one or more ovules
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The embryo sac is the product of three mitotic
divisions of the haploid megaspore it comprises
seven cells and eight haploid nuclei
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Self-incompatibility
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Calcium and pollen tube tip growth
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Angiosperm embryogenesis (Part 1)
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Angiosperm embryogenesis (Part 2)
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End.