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ULTRASTRUCTURE AND DEVELOPMENT OF THE NEXINE AND INTINE IN THE POLLEN WALL OF SILENE ALBA (CARYOPHYLLACEAE)
Author(s) -
Shoup Jane R.,
Overton Jane,
Ruddat Manfred
Publication year - 1981
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.1537-2197.1981.tb06392.x
Subject(s) - biology , callose , silene , microspore , caryophyllaceae , sporopollenin , botany , cytochemistry , ultrastructure , pollen , biophysics , cell wall , stamen
Nexine and intine development in Silene alba (Caryophyllaceae) was investigated by electron microscopy and enzyme cytochemistry. Nexine‐2 forms by deposition of sporopollenin along unit membrane lamellae closely associated with the microspore plasma membrane in the late tetrad stage. After the callose wall dissolves, electron density increases along the tangentially oriented fibers of the proximal primexine, forming nexine‐1. When the exine is essentially complete, the intine begins to develop. In the nearly mature microspore, acid phosphatase activity appears in the peripheral cytoplasm just prior to its extrusion into the intine of the mature pollen grain.