We can also determine steps in the signal transduction pathways mediating a plant's response to environmental or developmental stimuli. Among our targets are genes required for reproductive development. Development of male floral organs and apomixis are being dissected in this way. The initiation of flowering is an important developmental switch and genes, which initiate flowering in response to environmental or developmental stimuli, are being sought. We are also studying epigenetic phenomena in plant development by inducing alterations in DNA methylation levels and studying the effects on developmental processes.
Plant hormones mediate many environmental and developmental responses.
The role of gibberellins and ABA in controlling gene expression during germination and seedling growth is being analysed. Promoter elements and signal transduction pathways are being identified. Our understanding of gene expression is being applied to genetic engineering. Cotton and rice are being engineered for improved resistance to disease and pests, and barley for improved disease resistance and malting quality.