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Inhibition of Pisum sativum epicotyl elongation by white light – Different effects of light on the mechanical properties of cell walls in the epidermal and inner tissues
Author(s) -
Miyamoto Kensuke,
Ueda Junichi,
Hoson Takayuki,
Kamisaka Seiichiro,
Masuda Yoshio
Publication year - 1992
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.1399-3054.1992.tb04679.x
Subject(s) - epicotyl , biophysics , pisum , biology , elongation , epidermis (zoology) , cell wall , osmotic shock , shoot , botany , anatomy , biochemistry , materials science , gene , metallurgy , ultimate tensile strength
White fluorescent light (5 W m −2 ) inhibited subhook growth in derooted Alaska pea cuttings. In the inner tissue of the subhook, it inhibited the increase in osmotic potential during 18 h incubation. In the epidermis, on the other hand, light did not affect the osmotic potential. Light increased the minimum‐stress relaxation time (T 0 ) of the inner tissue cell walls, but did not change T 0 of the epidermal cell wall. Light decreased tissue stress determined by the split test and the ability of the inner tissue to extend by water absorption. The short‐term light effect on subhook growth. T 0 , and the tissue stress almost disappeared when pea cuttings were transferred to darkness. These facts suggest that light changes the mechanical properties of the cell wall in the inner tissue of shoots, and decreases tissue stress, which is considered to be the driving force of shoot growth.