By John Bowman
The fresh program of molecular genetics to difficulties of developmental biology has supplied us with better perception into the molecular mechanisms in which cells confirm their developmental destiny. this can be really obvious within the fresh growth in realizing of developmental tactics in version animal structures reminiscent of Drosophila melanogaster and Caenorhabditis elegans. De spite using crops in the various earliest genetics experiments, the elucida tion of the molecular bases of plant improvement has lagged at the back of that of animal improvement. in spite of the fact that, the emergence of version structures akin to Arabi dopsis thaliana, amenable to developmental genetics, has ended in the start of the unraveling of the mysteries at the back of plant morphogenesis. This atlas of the morphology and improvement of the weed Arabidopsis is in tended to be a reference ebook, either for scientists already acquainted with plant anatomy and for these using Arabidopsis who've come from different fields. the first focus is on descriptions instead of interpretations, as interpretations evolve and alter quite speedily, while the evolution of plant shape occurs on a far longer time scale. Molecular genetics and using mutants to probe wild-type gene functionality depend upon the wild-type being good characterised. With this in brain, an try out was once made to offer certain descriptions of wild-type constitution and improvement, to supply a starting place for comparability with the chosen mutants within the atlas. extra importantly, it truly is was hoping that the atlas will function a worthy source within the characterization of latest mutants.
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Additional info for Arabidopsis: An Atlas of Morphology and Development
The first 2 leaf primordia in fil mutants do not expand laterally, resulting in finger-like leaves lacking dorsiventrality. In addition, trichomes do not develop on these leaves. Following the formation of the first 2 leaf primordia, a short, leaf-like stem forms as the plant apparently begins to bolt. Two leaf-like structures form at the distal end of the leaf-like stem, with no obvious meristem remaining. Trichomes do develop on the distal surfaces of these leaf-like structures, but trichomes fail to develop all along their adaxial surfaces, as occurs in normal leaves.
The dip shoot apical meristem is misshapen and has no apparent zonation pattern. Further, the cellular patterns within leaf primordia are frequently disorganized, resulting in leaf primordia that appear wrinkled. Other leaf primordia do not expand laterally, resulting in peg-like leaves. (D) dip mutant at 17 days showing wrinkled leaves due to disorganization of the internal cells (p, leaf primordium; c, cotyledons). (E) Longitudinal section through a dip apex showing the misshapen shoot apical meristem (arrow).
20 long hypocotyl mutants Light-grown wild type and long hypocotyl (hy) mutant plants. , 1989a; Chory, 1992). These mutants were obtained by screening mutagenized seed in white light for seedlings with long hypocotyls, a long hypocotyl being one of the characteristics of a dark-grown seedling. The elongated stems of dark-grown plants are thought to be an adaptive response of underground or shaded plants to reach more favorable photosynthetic environments. , 1989a). , 1993). , 1980). Several other mutants that lack blue-light inhibition of hypocotyl elongation have been identified as well (Liscum and Hangarter, 1991).
Arabidopsis: An Atlas of Morphology and Development by John Bowman