The intricacies of plant growth and development present a fascinating
intellectual challenge, and yet our understanding of the subject has
increased relatively slowly, despite the application of many different
experimental approaches. Now, however, the introduction of molecular
methods, coupled with genetic transformation technology, has provided a
change in pace, and fundamental advances are occurring rapidly. This
volume, the second in our Plant Biotechnology series, shows how we are
beginning to understand the molecular basis of plant growth and
development, and are thus moving from the descriptive to the predictive
stage. The ability, discussed in chapter one, to generate a fivefold
change in plant height by overexpression of a single gene for the
photoreceptor phytochrome heralds not only a new phase in plant
photobiology but also highlights the close relationship between
fundamental knowledge and commercial application. Other chapters review
progress in our understanding of the molecular basis of hormone action
and processes such as tuber development, seed protein synthesis and
deposition, fruit ripening, and self-recognition during pollination. The
successful uses of antisense genes to alter the colour and pattern of
flowers and to change the enzymic composition of ripening fruit are also
discussed, together with identification and down- regulation of a gene
involved in ethylene synthesis by antisense technology. Opportunities
are considered for altering the composition and quality of harvested
plant organs and for using plants to synthesise novel products.