By Prof. Dr. Brij M. Johri, Dr. Kunda B. Ambegaokar, Dr. Prem S. Srivastava (auth.)
COMPARATIVE EMBRYOLOGY OF ANGIOSPERMS is a evaluation of the developmental methods resulting in sexual replica in flowering vegetation. at the foundation of embryological facts and likely evidences from different components of analysis, it lays designated emphasis at the dating between and in the households and orders of angiosperms. sometimes, inaccuracies in statement and interpretation are mentioned, substitute interpretations provided, gaps in our wisdom highlighted, and clients defined. The textual content is documented with 36 tables, 376 figures, and approximately 5000 literature citations, which give a contribution to creating this e-book complete. along with scholars and examine staff drawn to angiosperm embyology, taxonomists, plant breeders, agriculturists, and horticulturists also will locate a lot valuable info during this treatise.
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Additional info for Comparative Embryology of Angiosperms: Vol. 1, 2
French (1986a) made a further study of endothecial thickenings in representative species from 43 genera of Colocasioideae, Aroideae and Pistioideae. All endothecial cells are anticlinally elongated with bars or reticulate thickenings on anticlinal walls and variably discontinuous thickenings on periclinal walls. Several genera show unusual and distinctive patterns. In Stylochiton (Aroideae), the endothecial cells are periclinally elongated and exhibit continuous helices and rings. Other genera with a similar pattern occur in Monsteroideae and Lasioideae.
Dahlgren 1927a). The chalazal megaspore is functional in the majority of taxa (Fig. 1 C-F), and the development of embryo sac is of the Polygonum type. The micropylar megaspore functions in Balanophoraceae, Onagraceae, and Theaceae (Camellia). Occasionally, the epichalazal megaspore (one above the chalazal) is functional in Cannabis sativa (Mohan Ram and Nath 1964). At times, all the four megaspores of a tetrad develop concurrently and four binucleate megaspores (two-nucleate embryo sacs) are formed as in Casuarina equisetifolia (Swamy 1948a), and Jphigenia indica (Sulbha 1954a).
E Utricularia flexuosa, portion of ovule with degenerated embryo sac. Due to break down of endothelial cells a coenocytic pouch (cp) has been formed. c. Maheshwari 1954). In Elettaria (Panchaksharappa 1962b) and Hedychium (Sachar and Arora 1963), the cells of the nucellar epidermis below the micropyle elongate radially and form a nucellar pad. Such a radial elongation of nucellar cells also occurs in Aizoaceae and Cactaceae. In Leitneriaceae, Polygonaceae, Trapaceae, and some members of Euphorbiaceae, the nucellus develops a beak which projects through the micropyle.
Comparative Embryology of Angiosperms: Vol. 1, 2 by Prof. Dr. Brij M. Johri, Dr. Kunda B. Ambegaokar, Dr. Prem S. Srivastava (auth.)