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Ethylene‐induced putrescine accumulation modulates K + partitioning between roots and shoots in barley seedlings
Author(s) -
Tamai Tesshu,
Inoue Miwako,
Sugimoto Toshio,
Sueyoshi Kuni,
Shiraishi Naomasa,
Oji Yoshikiyo
Publication year - 1999
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.1399-3054.1999.106306.x
Subject(s) - putrescine , shoot , spermidine , spermine , ethylene , hordeum vulgare , polyamine , botany , chemistry , biology , horticulture , biochemistry , poaceae , enzyme , catalysis
We investigated the cause and effect relationships among ethylene, polyamines, and K + in barley ( Hordeum vulgare L. cv. Amagi) seedlings. Application of 1‐aminocyclopropane‐1‐carboxylic acid (ACC), a precursor of ethylene, to the growth medium caused a decrease in K + concentration in roots and an increase in shoots. Addition of ACC induced putrescine accumulation in roots, while spermidine and spermine levels remained unchanged. Exogenous supply of putrescine led to putrescine accumulation and reduced K + concentration. Application of Co 2+ , an inhibitor of ethylene biosynthesis, together with ACC, inhibited putrescine accumulation with a decrease in K + concentration in roots. ACC‐treated roots showed K + uptake capacity equivalent to that of control roots, implying that the majority of K + is translocated to shoots. These results suggest that ethylene regulates K + partitioning between roots and shoots through the level of accumulation of putrescine in barley seedlings.