Comparative Embryology of Angiosperms: Vol. 1, 2 by Prof. Dr. Brij M. Johri, Dr. Kunda B. Ambegaokar, Dr. Prem

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 approaches resulting in sexual replica in flowering crops. at the foundation of embryological facts and likely evidences from different components of analysis, it lays designated emphasis at the courting between and in the households and orders of angiosperms. sometimes, inaccuracies in statement and interpretation are mentioned, replacement 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 e-book entire. along with scholars and study employees attracted to angiosperm embyology, taxonomists, plant breeders, agriculturists, and horticulturists also will locate a lot valuable details during this treatise.

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Comparative Embryology of Angiosperms: Vol. 1, 2

COMPARATIVE EMBRYOLOGY OF ANGIOSPERMS is a evaluate of the developmental approaches resulting in sexual replica in flowering crops. at the foundation of embryological information and likely evidences from different components of analysis, it lays distinct emphasis at the courting between and in the households and orders of angiosperms.

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1A-F. SEM micrographs of developing ovules. A Passiflora racemosa, ovular primordia with initiation of anatropous curvature, and inner and outer integuments. B, C P. verspitilio, overgrowth of nucellus beyond integuments (B), and mature anatropous (C) ovule. D-F Agrostemma gracile, ovular primordia with initiation and development of integuments (D, E), and mature (F) ovules. (After Bouman 1984) 22 3 Developmental Aspects Type D has remained very stable and is known in about half of the dicotyledons.

Two middle layers are absorbed in the periplasmodium (F-H), thickenings appear in endothecium (I). 2D and E show the formation of multinucleate periplasmodium in which the tetrads, microspores and uninucleate pollen grains are embedded (Fig. 2F-I). Microtubules surround the tetrad facing the callose wall and the microspore. The tapetal plasmalemma facing the micros pores retracts from the exine surface leaving roughly cone-shaped spaces (Fig. 2H). Microtubules no longer lie parallel to the exine surface.

Philipson (1977) classifies the ovules into four types: Bitegmic crassinucellate (Type A), Bitegmic tenuinucellate (Type B), Unitegmic crassinucellate (Type C), and Unitegmic tenuinucellate (Type D). Ovules of Type A have been observed in Magnoliidae, Hamamelidae, Caryophyllidae, and most members of Dilleniidae and Rosidae (subclasses of Cronquist 1968). In a number of families of Dilleniidae, the ovules are of Type B, and in a few families of Type D. A large number of families of the Rosidae have ovules of Type C and D.

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