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Water Potential Modulates Extensibility of Rye Coleoptile Cell Walls
Author(s) -
Edelmann H. G.
Publication year - 1995
Publication title -
botanica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0932-8629
DOI - 10.1111/j.1438-8677.1995.tb00508.x
Subject(s) - coleoptile , secale , turgor pressure , polyethylene glycol , peg ratio , creep , cell wall , extensibility , materials science , biophysics , chemistry , biology , botany , biochemistry , composite material , finance , computer science , economics , operating system
Extensibility of walls of frozen/thawed rye ( Secale cereale ) coleoptile segments as a function of the water potential of the incubation solution (Ψ 0 ) was analyzed employing the creep test method. Negative Ψ 0 exerts an inhibiting effect on extension of isolated walls. The lower the Ψ 0 of polyethylene glycol 6000 (PEG), the less the walls of frozen/thawed segments extended under load. This inhibiting effect of Ψ 0 on wall creep was reversible and independent of the preincubation temperature of the segments. An increase in Ψ 0 resulted in increased extension rate within 2–4 min, whereas a decrease in Ψ 0 resulted in gradually decreasing extension rate after 8–12 min. This finding implies that wall extension changes during growth induced by changes of Ψ 0 in vivo are not only due to changes of turgor pressure but also due to a direct influence by negative Ψ 0 on physical wall properties. The results are discussed with respect to the regulation of extension growth during conditions of water stress.