Amyloplast development in etiolated and ethylene-treated pea epicotyls

The amyloplasts found in the apical hook cells of etiolated pea (Pisum sativum L.) epicotyls were randomly distributed. Sedimentation of endodermal amyloplasts in the direction of gravity became apparent in the transition from the hook to the top of the main axis of the epicotyl. Cortical amyloplast...

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Bibliographic Details
Published in:Planta 1988-09, Vol.175 (3), p.425-431
Main Authors: Grosskopf, D.G. (University Coll. of Wales, Aberystwyth, Dyfed (UK). Dept. of Botany and Microbiology), Scott, I.M
Format: Article
Language:English
Subjects:
Aethylen
AHILAMIENTO
Amyloplast
Amyloplasts
Biological and medical sciences
Cellular differentiation
EPICOTILOS
EPICOTYLE
EPICOTYLS
Epidermal cells
Epikotyl
Erbse
ETHYLENE
ETILENO
ETIOLATION
ETIOLEMENT
Etiolieren
Fundamental and applied biological sciences. Psychology
Geotropismus
Peas
Physical agents
PISUM SATIVUM
Plant cells
Plant physiology and development
Plants
PLASTE
PLASTIDIOS
PLASTIDS
Seedlings
Stem cells
TROPISME
TROPISMO
TROPISMS
Vegetative apparatus, growth and morphogenesis. Senescence
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Summary:The amyloplasts found in the apical hook cells of etiolated pea (Pisum sativum L.) epicotyls were randomly distributed. Sedimentation of endodermal amyloplasts in the direction of gravity became apparent in the transition from the hook to the top of the main axis of the epicotyl. Cortical amyloplasts in this region were not, however, sedimented. These patterns of sedimentation could not be related to changes in amyloplast size, and it is proposed that cytoplasmic properties determine amyloplast behaviour. The differentiation of plastids in the hook differed between the amyloplast-containing endodermal cells and the cortical cells, in which amoeboid plastids predominated over amyloplasts. Amyloplasts disappeared from the cortical cells in the main axis of the epicotyl, but in the endodermal cells sedimented amyloplasts were found throughout the upper epicotyl. Etiolated epicotyls induced to grow horizontally by treatment with ethylene had a normal content of amyloplasts, sedimented in the direction of gravity.
ISSN:0032-0935
1432-2048
DOI:10.1007/BF00396350