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Effect of tentoxin on K + transport in winter wheat seedlings of different K + ‐status
Author(s) -
Klotz Martin G.,
Erdei László
Publication year - 1988
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.1399-3054.1988.tb05836.x
Subject(s) - apoplast , valinomycin , xylem , chromosomal translocation , shoot , chemistry , winter wheat , poaceae , botany , biology , membrane , biochemistry , agronomy , cell wall , gene
Klotz, M. G. and Erdei, L. 1988. Effect of tentoxin on K + transport in winter wheat seedlings of different K + ‐status. The influence of the phytoeffective mycotoxin, tentoxin, [cyclo‐(L‐leucyl‐N‐methyltrans‐dehydronhenyl‐alanyl‐glycyl‐N‐methyl‐L‐alanyl)] (in K + uptake and on translocation of K + from roots to shoot was studied in 14‐day‐old winter wheat plants ( Triticum aestivum L. cv. Martonvásári‐8) grown at different levels of K + supply. For comparison, the effects of 2,4‐dinilrophcnol and valinomycin were also investigated. In I‐h experiments I p M tentoxin reduced K + influx in the routs over the external K + concentration range 0.1 to 1 m M (low‐K + plants), whereas stimulation was observed al lower and higher K + concentrations. On the other hand, in plants grown at 0.3 m M K + , tentoxin stimulated the translocation of K + from roots to shoots in 5‐h experiments. Valinomycin affected K + transport only al high K + ‐status (slight stimulation). In low‐K + plants 2,4‐dinitrophenol (DNP) caused drastic inhibition of K + uptake, but in high‐K + plants uptake was only slightly inhibited and translocation slightly stimulated, It is concluded that the opposite effects of tentoxin on K + uptake and translocation agree1 with the directions of the H + ‐ATPases pumping H + towards the apoplast and located at the cortex plasmalemma and the xylem parenchyma plasma‐membrane, respectively. These effects should probably be attributed to the interaction between tentoxin and the K + ‐carrier protein rather than to a direct influence of tentoxin on H + ‐ATPase.