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THE DEVELOPMENT OF MUCILAGINOUS RAPHIDE CRYSTAL IDIOBLASTS IN YOUNG LEAVES OF TYPHA ANGUSTIFOLIA L. (TYPHACEAE)
Author(s) -
Kausch Albert Paul,
Horner Harry T.
Publication year - 1983
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.1537-2197.1983.tb12448.x
Subject(s) - mucilage , biology , plastid , pyrenoid , vacuole , botany , amyloplast , ultrastructure , elongation , chloroplast , cell wall , thylakoid , xylem , biophysics , cytoplasm , microbiology and biotechnology , biochemistry , materials science , ultimate tensile strength , metallurgy , gene
Raphide crystal idioblast initiation occurs in the uppermost region of intercalary meristems in young leaves of Typha angustifolia L., and development proceeds acropetally. Idioblast differentiation commences with a loss of stored lipids, depletion of starch from amyloplasts, enlargement of the nucleus and nucleolus, cell elongation, and the formation of a central vacuole. Crystalloplastids are formed via dedifferentiation of amyloplasts, followed by an increase in plastid number as cell volume increases with cell elongation. Crystalloplastid membranes stain intensely with periodic acid‐thiocarbohydrazide‐silver proteinate (PA‐TCH‐SP). Following crystal production within the central vacuole, crystalloplastids differentiate lobed regions, dense with plastid ribosomes, thylakoids, lamellae, and plastoglobuli. Mucilage, which stains with PA‐TCH‐SP, appears to be formed at the tonoplast in the central vacuole and follows differentiation of crystalloplastid lobes. Crystal chambers are surrounded by lamellae during mucilage accumulation and the crystals undergo a change in shape. Lobed crystalloplastids may be involved in vacuolar mucilage formation in these types of raphide crystal idioblasts.