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Influence de la 6‐benzylaminopurine sur la différenciation plastidiale dans les cotylédons de concombre
Author(s) -
FARINEAU NICOLE,
ROUSSAUX JEAN
Publication year - 1975
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.1399-3054.1975.tb03792.x
Subject(s) - cytokinin , cucumis , chloroplast , cotyledon , ultrastructure , pigment , botany , biology , chemistry , biochemistry , organic chemistry , auxin , gene
Treatment with 6‐benzylaminopurine (6‐BAP; 10 −5 g/ml) accelerates the growth of detached cucumber cotyledons ( Cucumis sativas L.), primarily through an increased water uptake by the tissues. A comparative study of pigment composition and ultrastructure in 6‐BAP treated and untreated cotyledons shows that cytokinin, in the presence of light, accelerates the transformation of etioplasts into chloroplasts. 6‐BAP also enhances the synthesis of membrane precursors as indicated by the formation of a dense prolamellar body and by the persistence of a pseudo‐cristalline structure in 6‐BAP treated material. Stimulation of biosynthetic activity by cytokinin leads simultaneously to an increase in the rate of the pigment synthesis and to an acceleration in the building of the lamellar system. Furthermore, chloroplasts of 6‐BAP treated cotyledons show abnormal features such as a striking increase in the number of thylacoids per granum and a poor development of the intergranal system.