Models of pattern formation applied to plant development

摘要: Plants are the beautiful results of a chain complex pattern forming events. Pattern formation—the generation regular differences in space—occurs at several levels organization. For example, particular group cells shoot apex may receive signal to form leaf. The leaf will get polarity, developing an upper and lower side. Some develop into stomata, while chains other vascular strands. Individual become polar. All these patterns must ultimately arise from similar mechanisms although they do not act same structural level. In this chapter we would like discuss basic signalling systems among that allow generate different cell types defined spatial arrangement apply them plant development. We further show linkage such allows reproducible patterns. Models for primary shoot-root axis primordia around meristem be elaborated. These models certainly complete. instance, shape changes tissue (see Gierer, 1977a) or tissue-specific control proliferation discussed. Comparisons with formation freshwater polyp Hydra, imaginal disks insects patterning on shells some mollusks reveal plants work closely related those that, first sight, look very plants. plants, as most higher organisms, adult structure develops single cell. final cannot already present hidden form. Regulatory phenomena observed after experimental interference indicate communicate each achieve translation genetic information three-dimensional structure. assume given is initiated by biochemical consist high concentration one ore more substances. If mechanical forces involved bring shape, it assumed preceding chemical caused, rearrangement cytoskeleton. therefore assuming directly level (Green Poething, 1982 ; Oster et al, 1983).