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Fig. 1. Life cycle of Arabidopsis thaliana. The mature plant possesses
primary and secondary roots, rosette and cauline leaves, and inflorescences.
Flowers are composed of sepals, petals, stamens (male reproductive organs) and
carpels (female reproductive organs). After pollination, the fertilized egg
develops into an embryo inside the silique. The embryo possesses two
meristems, a shoot meristem (SAM) and a root meristem (RAM), where new organs
and tissues are initiated during post-embryonic growth. Seeds germinate and
give rise to seedlings composed of the embryonically-formed hypocotyl and
cotyledons. Further organogenesis depends on the action of shoot and root
meristems.
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