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| Author | : Jean-Paul Walch |
| Publisher | : John Wiley & Sons |
| Total Pages | : 260 |
| Release | : 2024-07-24 |
| Genre | : Science |
| ISBN | : 1394306342 |
Download Phyllotaxis and Symmetry in Angiosperms Book in PDF, ePub and Kindle
Symmetry and the causes of shifts in different types of symmetries in flowers follow specific patterns that are ruled by developmental and genetic factors. Using a unified system of phyllotaxic equations, we have modeled the molecular mechanisms and pressure forces that act in inflorescence and floral meristems, giving flowers their organ arrangement. In this book, we state general physical principles, whereby the symmetry of the perianth is derived from the symmetry of certain TCP gene expression. Thus, we define the interplay between the expression of CYC2-like genes and the phyllotactic mechanisms. This new evo-devo approach is applied to major groups of angiosperms with predominantly actinomorphic flowers (in which rare zygomorphy is positional) and groups with mainly bilaterally symmetrical flowers (in which zygomorphy is constitutional). It has thus allowed us to revisit the contributions of the great floral morphologists of the 20th and early 21st centuries.
| Author | : Roger V. Jean |
| Publisher | : World Scientific |
| Total Pages | : 900 |
| Release | : 1998 |
| Genre | : Science |
| ISBN | : 9789810226213 |
Download Symmetry in Plants Book in PDF, ePub and Kindle
The book deals with biological, mathematical, descriptive, causal and systemic phyllotaxis. It aims at reflecting the widest possible range of ideas and research closely related to phyllotaxis and contains 30 well illustrated chapters.The book has three parts of equal importance. The first two parts concern data collecting, pattern recognition and pattern generation to which students of phyllotaxis are well accustomed. The third part is devoted to the problem of origins of phyllotactic patterns, giving the field of phyllotaxis the universality it requires to be fully understood.Phyllotaxis-like patterns are found in places where genes are not necessarily present. Part III concerns general comparative morphology, homologies with phyllotactic patterns, and recent trends on evolution that can help to understand phyllotaxis.The distinguished researchers who accepted to participate in the production of this book, strongly contributed to the field of phyllotaxis in the past and have devoted a lot of their time to the fascinating subject coming up with most valuable findings, or are newcomers with original ideas that may be very relevant for the future of the field. The book summarizes and updates their contributions, and promotes new avenues in the treatment of phyllotaxis.This book on mathematical and biological phyllotaxis is the first collective book ever. A landmark in the history of phyllotaxis.
| Author | : Jean-Paul Walch |
| Publisher | : John Wiley & Sons |
| Total Pages | : 260 |
| Release | : 2024-08-27 |
| Genre | : Science |
| ISBN | : 1786309890 |
Download Phyllotaxis and Symmetry in Angiosperms Book in PDF, ePub and Kindle
Symmetry and the causes of shifts in different types of symmetries in flowers follow specific patterns that are ruled by developmental and genetic factors. Using a unified system of phyllotaxic equations, we have modeled the molecular mechanisms and pressure forces that act in inflorescence and floral meristems, giving flowers their organ arrangement. In this book, we state general physical principles, whereby the symmetry of the perianth is derived from the symmetry of certain TCP gene expression. Thus, we define the interplay between the expression of CYC2-like genes and the phyllotactic mechanisms. This new evo-devo approach is applied to major groups of angiosperms with predominantly actinomorphic flowers (in which rare zygomorphy is positional) and groups with mainly bilaterally symmetrical flowers (in which zygomorphy is constitutional). It has thus allowed us to revisit the contributions of the great floral morphologists of the 20th and early 21st centuries.
| Author | : Bir Bahadur |
| Publisher | : CRC Press |
| Total Pages | : 370 |
| Release | : 2019-03-25 |
| Genre | : Nature |
| ISBN | : 0429960700 |
Download Asymmetry in Plants Book in PDF, ePub and Kindle
Plants exhibit forms of asymmetry analogous to "handedness" in bilaterally symmetrical animals. This book explores the evolutionary significance and development of asymmetry. Examples of genetic control include the direction of tendril or stem coiling of many climbing plants; the so-called spiral phyllotaxy and floral taxy; and contorted petal arrangement is another kind of left- right symmetry in plants; the direction of contortion is fixed in some but not in other plants. The book will underscore tha all phenomena related to handedness start during embryogenesis itself, with the occurrence of embryo rotation. Key selling features: First consolidated book on Plant Handedness Relates handedness, asymmetry and chirality to the evolution of different organizational levels in plant biology Emphasizes handedness as a vital governing force in plant functional evolution Provides a new perspective, hitherto ignored, into plant developemtn and evolution Describes how an age-old phenomenon can give scope for investigation from a very modern interdisciplinary approach
| Author | : Jean-Paul Walch |
| Publisher | : John Wiley & Sons |
| Total Pages | : 228 |
| Release | : 2023-07-13 |
| Genre | : Science |
| ISBN | : 1394228120 |
Download Phyllotaxis Models Book in PDF, ePub and Kindle
The equations of phyllotaxis were discovered by Douady and Couder: these describe the inhibition "force" generated by an incipient primordium, preventing the initiation of other primordia in its vicinity: the method that was lacking was to take into account the distance of primordia to the meristem apex over the course of its development. With these parameters, our model integrates both biochemical "forces" (inhibition due to auxin) and mechanical forces (contact pressure). This powerful tool allows us to revisit many important notions of plant biology. For example, we model auxin concentrations at the plant apex, as well as the development of vegetative and reproductive meristems. We also explain why the whorls of monocots are trimerous and those of plants with quincuncial perianths are pentamerous. We design a geometric method for reconstructing inflorescences from their building blocks, i.e. floral meristems. We also show that phyllotaxic spirals are only the application of a general property of symmetry, the advantages of which have been exploited by natural selection.
| Author | : Arthur Harry Church |
| Publisher | : |
| Total Pages | : 480 |
| Release | : 1919 |
| Genre | : Brown algae |
| ISBN | : |
Download On the Interpretation of Phenomena of Phyllotaxis Book in PDF, ePub and Kindle
| Author | : Roger V. Jean |
| Publisher | : Cambridge University Press |
| Total Pages | : 402 |
| Release | : 1994-01-28 |
| Genre | : Mathematics |
| ISBN | : 0521404827 |
Download Phyllotaxis Book in PDF, ePub and Kindle
Phyllotaxis, the study of the patterns exhibited by leaves and other organs of plants, raises some of the deepest questions of plant morphogenesis. What principles of biological organisation produce these dynamical geometric systems? The constant occurrence of the Fibonacci sequence in such systems is a phenomenon that has fascinated botanists and mathematicians for centuries. In this book, first published in 1994, the many facets of phyllotaxis are dealt with in an integrated manner for the first time. The author describes a unified concept of phyllotaxis based on experimental, anatomical, cellular, physiological and paleontological observations. The book provides a framework for formal analyses of botanical data and emphasises the relevance of the phyllotactic paradigm in the study of other structures, such as crystals and proteins. It is of interest to cystallographers and physicists as well as to botanists and mathematicians.
| Author | : Laura Nuno de la Rosa |
| Publisher | : Springer |
| Total Pages | : 1000 |
| Release | : 2020-11-15 |
| Genre | : Science |
| ISBN | : 9783319329772 |
Download Evolutionary Developmental Biology Book in PDF, ePub and Kindle
This reference work provides an comprehensive and easily accessible source of information on numerous aspects of Evolutionary Developmental Biology. The work provides an extended overview on the current state of the art of this interdisciplinary and dynamic scientific field. The work is organized in thematic sections, referring to the specific requirements and interests in each section in far detail. “Evolutionary Developmental Biology – A Reference Guide” is intended to provide a resource of knowledge for researchers engaged in evolutionary biology, developmental biology, theoretical biology, philosophy of sciences and history of biology.
| Author | : Scott G. Hotton |
| Publisher | : |
| Total Pages | : 198 |
| Release | : 1999 |
| Genre | : Fibonacci numbers |
| ISBN | : |
Download Symmetry of Plants Book in PDF, ePub and Kindle
| Author | : Arthur Harry Church |
| Publisher | : |
| Total Pages | : 140 |
| Release | : 1919 |
| Genre | : Plant anatomy |
| ISBN | : |
Download Elementary Notes on the Reproduction of Angiosperms Book in PDF, ePub and Kindle
