Author: A. de LangePublisher:
ISBN:
Category : Begonias
Languages : en
Pages : 7
Book Description
Micromorphology of the Seeds in Begonia Section Solananthera A. DC.
Author: A. de LangeMicromorphology of the Seeds in Begonia Section Solanthera A. DC
Author: Seed Micromorphology of Neotropical Begonias
Author: Anton De LangePublisher:
ISBN:
Category : Science
Languages : en
Pages : 60
Book Description
The seeds of about 235 Neotropical Begonia species, representing almost all recognized American Begonia sections, were studied using scanning electron microscopy. The seeds show an appreciable diversity in size, shape, and micromorphology, which is helpful in the delimitation of sections and sometimes also of species. Mean seed length varies from 235 m in Begonia filipes to 1450 m in B. fruticosa; most seeds have a length between 300 m and 600 m. The shape of the seeds varies from almost globular to narrowly elliptic, and the length to width ratio ranges from 1.2 in B. hexandra to 8.1 in B. fruticosa. Further differences exist in the shape of the testal cells, the undulation of the anticlinal walls, the bulging of the outer periclinal walls, and the pattern and roughness of the cuticle. Five of the 15 mainly Brazilian, five of the 12 Andean and Guianan, and one of the eight middle American sections have a seed structure that is characteristic at the sectional level. All these sections have a relatively restricted geographical distribution, and they may differ in growth form or habitat. Most species of the other sections, including the larger and more widely distributed sections Begonia, Gireoudia, and Knesebeckia, have seeds conforming to the ordinary seed type. In a number of the sections, the structural differences of the seeds are nicely correlated with differences in growth form and/or in means of dispersal. In contrast to the African begonias, the great majority of the Neotropical begonias have anemoballistic dispersal. Seeds may be adapted to wind dispersal by extended micropylar and/or chalazal ends with inflated, air-filled cells, such as in the Brazilian sections Solananthera, Trendelenburgia, and Enita and in the Andean section Rossmannia, or by a more pronounced surface with deep, collapsed testal cells, such as in sections Gobenia and Scheidweileria. Zooballistic dispersal by passing animals is supposed to be present in section Casparya. The seeds of sections Casparya and Trachelocarpus have very pronounced cuticular patterns and may be secondarily dispersed by rain wash or by adhering to animals. No distinct indications for an intercontinental relationship between Neotropical, African, and Asiatic sections could be established.
The Sections of Begonia
Author: J. DoorenbosBibliography on Seed Morphology
Author: Hans Arne JensenPublisher: CRC Press
ISBN: 9789054104506
Category : Science
Languages : en
Pages : 324
Book Description
Seeds are a vital part of life on earth. They are fundamental for plant reproduction, and many seeds play an important role in the diet of man and domestic and wild animals. Knowledge of the appearance of seeds - seed morphology - is of great importance to botany and seed identification in relation to: seed setting, quarantine work, forensic work, seed poisening, studies of seed dispersal, seed banks and archaeological studies.;This bibliography contains 3775 references and is divided in two parts: handbooks, and articles and monographs. In the latter the bibliographical reference is supplemented by information of importance to seed identificaiton: genera mentioned in articles, keys, descriptions, drawings, photograph, scanning electron micrographs, anatomy and chemical methods. The index of authors contains the names of an extensive number of authors, cited in the bibliography, and in the index of genera more than 3900 genera, described in one or more of the publications are cited.
Structure, Micromorphology of Begonia Seeds
Author: Ferdinand BoumanPublisher:
ISBN:
Category : Begonias
Languages : en
Pages : 9
Book Description
Micromorphology of the Seed Coats in Begonia Section Squamibegonia Warb
Author: Ferdinand BoumanPublisher:
ISBN:
Category : Begonias
Languages : en
Pages : 9
Book Description
Smithsonian Contributions to Botany
Author: Smithsonian InstitutionPublisher:
ISBN:
Category : Botany
Languages : en
Pages : 60
Book Description
Horticultural Abstracts
Author: Comparative Embryology of Angiosperms Vol. 1/2
Author: Brij M. JohriPublisher: Springer Science & Business Media
ISBN: 3642763952
Category : Science
Languages : en
Pages : 1243
Book Description
COMPARATIVE EMBRYOLOGY OF ANGIOSPERMS is a review of the developmental processes leading to sexual reproduction in flowering plants. On the basis of embryological data and certain evidences from other areas of study, it lays special emphasis on the relationship among and within the families and orders of angiosperms. Occasionally, inaccuracies in observation and interpretation are pointed out, alternative interpretations offered, gaps in our knowledge highlighted, and prospects outlined. The text is documented with 36 tables, 376 figures, and about 5000 literature citations, which contribute to making this book comprehensive. Besides students and research workers interested in angiosperm embyology, taxonomists, plant breeders, agriculturists, and horticulturists will also find much useful information in this treatise.