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USE OF GROWTH CHARACTERISTICS IN STUDIES OF MORPHOLOGIC RELATIONS. I. SIMILARITIES BETWEEN EPIBLAST AND COLEORHIZA
Author(s) -
Foard Donald E.,
Haber Alan H.
Publication year - 1962
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.1537-2197.1962.tb14974.x
Subject(s) - epiblast , biology , germination , botany , embryo , microbiology and biotechnology , gastrulation , embryogenesis
F oard , D onald E., and A lan H. H aber . (Oak Ridge Natl. Lab., Oak Ridge, Tenn.) Use of growth characteristics in studies of morphologic relations. I. Similarities between epiblast and coleorhiza. Amer. Jour. Bot. 49(5): 520–523. Illus. 1962.—We compared the characteristics of wheat epiblast, coleorhiza, and leaves during germination and seedling growth. Although the epiblast and coleorhiza grow without cell division during germination, they sometimes produce hairs that resemble root hairs but are different in form and mode of origin from leaf hairs. Despite the similar orientation of the epiblast and leaves with respect to the main axis of the plant, during growth the epiblast changes shape such that the axis of greater linear extension per millimeter is perpendicular to the main axis of the plant, whereas leaves change shape such that the greater rate of linear extension per millimeter is parallel to the main axis of the plant. Indoleacetic acid treatment produces excessive and disorganized growth of both the epiblast and coleorhiza but retards leaf growth. Gibberellic acid stimulates, whereas (2‐chloroethyl)trimethylammonium chloride retards leaf growth. Neither substance significantly affects epiblast or coleorhiza. We conclude that the epiblast is not leaf‐like, but together with the coleorhiza forms a single, continuous structure. This paper illustrates how a wide variety of growth characteristics may be used to complement classical anatomic approaches in studies of morphologic relations.