By Prof. Dr. Brij M. Johri, Dr. Kunda B. Ambegaokar, Dr. Prem S. Srivastava (auth.)
COMPARATIVE EMBRYOLOGY OF ANGIOSPERMS is a overview of the developmental tactics resulting in sexual replica in flowering crops. at the foundation of embryological information and sure evidences from different parts of research, it lays unique 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 customers defined. The textual content is documented with 36 tables, 376 figures, and approximately 5000 literature citations, which give a contribution to creating this ebook accomplished. in addition to scholars and learn employees drawn to angiosperm embyology, taxonomists, plant breeders, agriculturists, and horticulturists also will locate a lot precious details during this treatise.
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Extra resources for Comparative Embryology of Angiosperms: Vol. 1, 2
The plasmalemma of the pollen cytoplasm develops radially oriented cytoplasmic tubules containing proteins, in the developing intine. As the intine grows, these tubules with proteins are cut off from the plasmalemma by a layer of intine which is free from tubules. Thus, the intine proteins are the products of the pollen grain cytoplasm (gametophytic). The intine proteins are concentrated more in the region of germ-pores in aperturate pollen grains, whereas they are distributed throughout in the non-aperturate pollen grains of monocotyledons (Knox 1971, 1984, Shivanna 1978, Chanda et al.
Schematic representation of the methods of polyploidization in the cells of the internal anther tapetum of Solanum tuberosum (2n = 48). DM diplochromosome mitosis; E endomitosis; FDN fusion of daughter nuclei; M mitosis; RM restitutional mitosis; SF spindle fusion; SFjDM Spindle fusion in diplochromosome mitosis. (Adapted from Avanzi 1950, see D'Amato 1984) 3 Developmental Aspects 10 me ,- II : J F c B A ,. ' ': ' .! 8 :: ~ Ie ! /" , - H Fig. 2A-I. Arum italieum, amoeboid tapetum (semi-diagrammatic).
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. The nucellar cap, nucellar pad, and nucellar beak are features of taxonomic importance in several families. Vascular elements have been observed in the nucellus of Acalypha (Sect. 9), Casuarina (Sect. 2), Duabanga (Sect. 7) and several other taxa. The nucellus is generally consumed during the growth of the embryo sac, but in Centrospermales (Fig.