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

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By John Bowman

The contemporary program of molecular genetics to difficulties of developmental biology has supplied us with higher perception into the molecular mechanisms through which cells be certain their developmental destiny. this is often relatively glaring within the fresh development in knowing of developmental strategies in version animal structures equivalent to Drosophila melanogaster and Caenorhabditis elegans. De­ spite using crops in a few 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. despite the fact that, the emergence of version platforms equivalent to Arabi­ dopsis thaliana, amenable to developmental genetics, has resulted 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 booklet, 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 particularly swiftly, 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 upon the wild-type being good characterised. With this in brain, an try out used to be made to give distinctive descriptions of wild-type constitution and improvement, to supply a origin for comparability with the chosen mutants within the atlas. extra importantly, it really is was hoping that the atlas will function a beneficial source within the characterization of recent mutants.

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73, nearly 3 more than in wild type. In K, 6 leaves have been removed, exposing the apical meristem. Four more developing leaf primordia are evident. L shows in side view another 6day-old apex of clv3-2. Bar = 10 /-Lm in 0, J; 15 /-Lm in G; 20 /-Lm in A; 25 /-Lm in B, C, E, F, H, I, K, L. M. 5 forever young (fey) Apical meristem mutants The recessive mutant fey was generated by T-DNA insertional mutagenesis (Feldmann, 1991). , 1992). Plants containing fey have abnormalities in the organization of the apical meristem and developing leaf primordia such that leaf primordia are usually initiated with greater than the normal number of cells.

S. Poole and J. Chory Photo of capl plastid provided by Xing-Wang Deng and Albrecht von Arnim. E reproduced by permission from American Society of Plant Physiologists. F reproduced by permission from Cold Spring Harbor Laboratory Press © 1991. 19 de-etiolated mutants Adult phenotypes of de-etiolated (det) mutant plants. (A) From left to right, wild type, detl-l, detl-2, and a phytochrome-deficient long hypocotyl (hy) mutant (hy6) (Chary, 1991). Both detl and det2 show reduced apical dominance as adult plants.

The cells on the right in the micrograph have a highly elaborated endomembrane system. There are large numbers of vesicles and a large fibrous body in each cell. The function of this elaborated membrane system is obscure. On the left are the vacuolate cells of the young leaf. Note the clear, electron-dense cuticle on both the leaf and the stipule. m. K. 13 Morphology of the expanded first leaves (A) Cross-section of a fully expanded first leaf. Clearly differentiated adaxial (upper) palisade mesophyll (p) and abaxial (lower) spongy mesophyll (s) are evident.

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