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Calcium ion transport across discs of the cortical flesh of apple fruit in relation to fruit development
Author(s) -
Harker F. R.,
Ferguson I. B.
Publication year - 1988
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.1399-3054.1988.tb02039.x
Subject(s) - flesh , extracellular , calcium , chemistry , cell wall , botany , ion transporter , biophysics , horticulture , biology , biochemistry , food science , membrane , organic chemistry
Transport of Ca 2+ through discs of apple fruit tissue was examined in tissue taken at different stages of fruit development. Transport rates decreased with fruit development when cation exchange was the predominant influence on transport (with 10 −6 M 45 CaCl 2 as the source solution). This decrease was associated with a reduction in relative cell wall surface area, cation exchange capacity and cell wall yield that occurred during fruit growth. When diffusion was the major transport force, and when transport was influenced by solution infiltration of the tissue disc (10 −2 M 45 CaCl 2 in the source solution), transport rates increased during fruit growth. This increment was related to increases in air space of the tissue. Ca 2+ transport through apple fruit tissue is influenced by the extent and nature of the cell wall, changing proportions of air space and Ca 2+ concentration in the extracellular solution.