Plant Reproduction and Development
From the patterning of a flower to the maturation of a seed, plant reproduction and development trace how plants build new bodies and pass life to the next generation through an alternation of generations.
Definition
Plant reproduction and development is the study of how plants produce offspring and how the plant body is formed and patterned, from gamete to mature organism, including the alternation of haploid and diploid generations.
Scope
This area covers sexual and asexual reproduction in plants, the genetic control of flower formation, fertilization and the development of embryo and seed, and the meristem-based growth that builds and continually extends the plant body.
Sub-topics
Core questions
- How is the identity of floral organs specified during flower development?
- How do fertilization and embryogenesis give rise to the seed?
- How do meristems generate and pattern the growing plant body?
Key theories
- ABC model of floral organ identity
- Combinatorial activity of three classes of homeotic genes specifies the four floral organ types in concentric whorls, a framework derived from mutants in Arabidopsis and Antirrhinum.
- Alternation of generations
- The plant life cycle alternates between a diploid sporophyte and a haploid gametophyte, with the relative dominance of each shifting across the major plant lineages.
Clinical relevance
Reproduction and development underpin agriculture: control of flowering, pollination, fruit set, and seed quality determines crop yield, while developmental genetics enables hybrid breeding, apomixis research, and the engineering of plant architecture.
History
Hofmeister recognized the alternation of generations across plant groups in the nineteenth century; a century later, genetic analysis of floral mutants by Coen, Meyerowitz, and colleagues opened the molecular study of plant development.
Key figures
- Elliot Meyerowitz
- Enrico Coen
- Wilhelm Hofmeister
Related topics
Seminal works
- coen1991
- raven2013
Frequently asked questions
- What is alternation of generations?
- Plants cycle between a multicellular diploid sporophyte, which produces spores, and a multicellular haploid gametophyte, which produces gametes; fertilization restores the sporophyte, alternating the two generations.
- What is the ABC model of flower development?
- The ABC model explains how three overlapping classes of genes act in combination across the floral whorls to specify sepals, petals, stamens, and carpels, accounting for the homeotic transformations seen in floral mutants.