Download Arabidopsis: An Atlas of Morphology and Development by John Bowman PDF

By John Bowman

The fresh software of molecular genetics to difficulties of developmental biology has supplied us with higher perception into the molecular mechanisms in which cells be sure their developmental destiny. this can be fairly obvious within the contemporary growth in realizing of developmental techniques in version animal structures corresponding to Drosophila melanogaster and Caenorhabditis elegans. De­ spite using vegetation in many of the earliest genetics experiments, the elucida­ tion of the molecular bases of plant improvement has lagged at the back of that of animal improvement. even if, the emergence of version platforms comparable to Arabi­ dopsis thaliana, amenable to developmental genetics, has ended in the start of the unraveling of the mysteries in 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 conversant in 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 really quickly, while the evolution of plant shape occurs on a miles longer time scale. Molecular genetics and using mutants to probe wild-type gene functionality depend on the wild-type being good characterised. With this in brain, an try was once made to offer targeted descriptions of wild-type constitution and improvement, to supply a starting place for comparability with the chosen mutants within the atlas. extra importantly, it's was hoping that the atlas will function a precious source within the characterization of recent mutants.

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These aberrations result in an irregular pattern of leaf formation and usually lead to premature death of the shoot. At low temperatures, the shoot apical meristem reorganizes and forms multiple meristems. (A) fey mutant at 16 days. (B) Median section through a fey apex at 8 days. The third leaf primordium (p) is initiated with more cells than in wild type. (C) Cross section through a fey shoot apex at 30 days. Leaf primordia are are initiated in a random pattern. (D) fey mutant at 27 days. When fey plants are grown at low temperature, the shoot apical meristem reorganizes and gives rise to multiple shoots.

8 Early development of the leaf (A-C) Transverse sections of young Arabidopsis leaves from the apex of seed- lings. (A) 5 days after sowing. (B) 6 days after sowing. (C) 8 days after sowing. The first pair of leaves, which are surrounded by cotyledonary tissue, expand quickly and by day 6 the differentiation of the mesophyll into palisade and spongy mesophyll is evident. By day 8 a distinct layer of palisade mesophyll cells (arrows) is visible beneath the upper epidermis on the inside surface of the expanding leaf.

A 3-branched trichome, with its characteristic surface pattern, is prominent. Lm. P. Linstead, L. Dolan, and K. , 1993). Hypocotyl (hy), cotyledons (co), and leaf primordia (Ip) are indicated. Etiolated seedlings are characterized by the presence of elongated hypocotyls, folded cotyledons, an apical hook, etioplasts, and the absence of leaves. , 1989b). Lightgrown plants have short hypocotyls and expanded cotyledons, and the plants develop leaves. The plastids in the cotyledons and leaves of light-grown plants develop into chloroplasts.

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