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Relation entre réaction géotropique et évolution du statenchyme dans la racine d'Asperge
Author(s) -
PERBAL GÉRALD,
RIVIÈRE SIMONNE
Publication year - 1976
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1976.tb04855.x
Subject(s) - amyloplast , etiolation , asparagus , botany , plastid , organelle , gravitropism , biology , physics , mutant , arabidopsis , microbiology and biotechnology , biochemistry , chloroplast , gene , enzyme
Relationship between the Geotropic Response and the Evolution of the Statenchyma in Roots of Asparagus officinalis. The evolution of the statenchyma in roots of Asparagus of ficinalis seedlings, grown in obscurity, was followed during the first 17 days. After 7 days of etiolation, a decrease of both the average diameter of the amyloplasts and the average number of these organelles was observed in the central root cap cells. If the seedlings were illuminated (with white light) from the 7th day, the average number of statoliths increased rapidly in the statocytes. The volume of these organelles undergoes the same variation in etiolated and in illuminated plants. The initial rate of curvature ( V i ) of the roots (stimulated in a horizontal position) and the volume of amyloplasts ( V ac ) in their caps were analysed as a function of the time of germination in obscurity (from the 8th to the 17th day). It was found that V i increased as a linear function of the logarithm of V ac , which confirms that the weight of the amyloplasts of the statocytes may play a role in the geotropic stimulation of the roots.