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Plant Development - Lesson Summary

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The key points from this module are:
The expression of homeotic genes is a dynamic process.

Some unique aspects of plant development are:

Plant cells do not migrate.
Plants have sporic meiosis rather than gametic meiosis.
The life cycle of most plants alternates between diploid and haploid multicellular stages.
Plant germ cells are not set aside early in development.
Plants undergo extended morphogenesis.
Plants have tremendous plasticity.
.Multicellularity evolved independently in plants and animals.
In gymnosperms, the pollen tube may take one year to fully grow. Whilst in some flowering plants, it grows cm/hour.

Fertilization is not an absolute prerequisite for embryo formation.
Apomixis means the development of an embryo from a haploid egg or from non-meiotic cells.

Meristem is a cluster of stem cells. There are two types of meristems.
Shoot apical
Root apical

For germination to take place environmental factors like temperature, water, light and oxygen are crucial.

Shoot and roots develop from apical meristems, with undifferentiated cells clustered at their tips.