A Brief Overview of Plant Development

Lange

BIOL 370 – Developmental Biology

Topic #5

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.

Plants have haplodiplontic life cycles that involve mitotic divisions in both the haploid and diploid generations

Life cycle of an angiosperm, represented here by a pea plant (genus Pisum) (Part 1)

Life cycle of an angiosperm, represented here by a pea plant (genus Pisum) (Part 2)

(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.

The carpel consists of the stigma, the style, and an ovary containing one or more ovules

The embryo sac is the product of three mitotic divisions of the haploid megaspore; it comprises seven cells and eight haploid nuclei

Self-incompatibility

Calcium and pollen tube tip growth

Angiosperm embryogenesis (Part 1)

Angiosperm embryogenesis (Part 2)

End.