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Effects of nitrate on influx, efflux and translocation of potassium in young sunflower plants
Author(s) -
Pettersson Sune
Publication year - 1984
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.1399-3054.1984.tb05188.x
Subject(s) - helianthus annuus , chromosomal translocation , sunflower , potassium , efflux , shoot , chemistry , horticulture , botany , biology , biochemistry , organic chemistry , gene
Influx, efflux and translocation of K + ( 86 Rb) were studied in the roots of sunflower seedlings ( Helianthus annuus L. cv. Uniflorus) treated with 0–4.0 m M NO 3 − during a 9 day growth period or a 24 h pretreatment period. Roots treated with high levels of NO 3 − absorbed and translocated more K + ( 86 Rb) than seedlings treated with low levels of NO 3 − . The content of K + in the shoots was, however, higher in seedlings treated with low levels of NO 3 − , indicating a low rate of retranslocation of K + in those plants. K + ( 86 Rb) efflux was highest into the low‐NO 3 − solutions. All effects on K + ( 86 Rb)‐fluxes were more obvious in high‐K plants than in low‐K plants. The results are discussed in relation to the Dijkshoorn‐Ben Zioni hypothesis for K + + NO 3 − ‐uptake and translocation in plants.