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Effect of light on abscisic acid‐induced proline accumulation in leaves: comparison between barley and wheat
Author(s) -
Pesci P.
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 - 10.1034/j.1399-3054.1992.860204.x
Subject(s) - abscisic acid , proline , hordeum vulgare , poaceae , biology , incubation , chemistry , biochemistry , botany , amino acid , gene
Light enhanced the abscisic acid‐induced accumulation of proline in barley ( Hordeum vulgare L. cv. Georgie) and wheat ( Triticum durum L. cv. Valnova). In wheat ABA is ineffective in the dark. In both barley and wheat, the accumulation of proline in the light showed the same characteristics as those of the process that occurs in barley in the dark, namely a synergistic interaction between the hormone and K(Na)Cl, an enhancing effect of Cl − anion in excess over K + cation in the incubation medium, and an inhibiting effect of D ‐mannose and monensine. In wheat, furthermore, light is needed during treatment with ABA if proline is to accumulate. Light was effective in both wheat and barley during the second or accumulation phase of the hormonal process, whereas the events occurring in the first (or lag) phase did not require light. The results suggest that in wheat light induces a putative factor(s) involved in the proline accumulation pathway that is lost in the dark, whereas in barley it is present in the dark.