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THE DEVELOPMENTAL ANATOMY OF THE ANNONACEAE. I. EMBRYO AND EARLY SEEDLING STRUCTURE
Author(s) -
Hayat M. Arif,
Canright James E.
Publication year - 1965
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1965.tb06780.x
Subject(s) - hypocotyl , biology , meristem , embryo , cotyledon , botany , seedling , anatomy , microbiology and biotechnology , shoot
Development of the epicotylary meristem is delayed; thus, it apparently has no immediate controlling influence on the procambium initiation either in the hypocotyl‐root axis or in the cotyledons. Contrary to the situation found in most herbaceous dicotyledons, the procambium forms a hollow cylinder in the axis of the mature embryo. The first protophloem differentiates simultaneously in the upper part of the hypocotyl‐root axis, at the base of the cotyledons, and in the cotyledons; protoxylem differentiation follows the same pattern as that of the protophloem. The direct vascular connection between the hypocotyl‐root axis and cotyledons is established early in the mature embryo, and the fundamental aspects of transition phenomena are exhibited by the procambium before mature vascular elements differentiate. In the mature embryos, the pattern of lateral differentiation is irregular in that the number of protoxylem elements present at different levels is quite variable.