ISSN:
1432-2048
Keywords:
Acid-growth theory
;
Cell enlargement
;
Cell-wall extensibility
;
Leaf expansion
;
Phaseolus
;
Proton excretion
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Light-induced expansion of Phaseolus vulgaris L. leaf cells is accompanied by increased cell-wall plasticity. The possibility that leaf-cell walls are loosened by excreted protons has been investigated. First, light causes acidification, detected at the leaf surface, within 5–15 min. Growth starts 10–20 min after exposure to light. Second, exogenous acid induces loosening of isolated leaf cell walls. Third, infiltration of the tissue with a neutral buffer inhibits light-induced growth. Fourth, fusicoccin stimulates growth of as well as H+ excretion by bean leaf cells, without light. These findings show that the acid-growth theory is applicable to light-induced growth of leaf cells, and indicate that light-induced proton excretion initiates cell enlargement in leaves.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00380038
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