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PHYTOCHROME CONTROLLED NYCTINASTY IN ALBIZZIA JULIBRISSIN. I. ANATOMY AND FINE STRUCTURE OF THE PULVINULE
Author(s) -
Satter Ruth L.,
Sabnis Dinkar D.,
Galston Arthur W.
Publication year - 1970
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.1537-2197.1970.tb09826.x
Subject(s) - biology , turgor pressure , vacuole , biophysics , anatomy , matrix (chemical analysis) , cytoplasm , microbiology and biotechnology , chemistry , chromatography
Under appropriate experimental conditions, phytochrome controls leaflet closure in Albizzia by regulating differential turgor changes in motor cells of the pulvinule. Closure occurs when subepidermal dorsal cells expand and ventral cells become compressed; reopening involves the reverse changes. The internal cells surrounding the vascular core remain relatively unchanged during leaflet movement. Fine structural studies revealed several unusual features of the motor cells including: (1) fibrils oriented parallel to one another in the cytoplasmic matrix; (2) numerous spherosomes that appear to coalesce and enlarge to form vacuoles; and (3) a multivacuolate condition.