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Long distance transport of potassium in cereals during grain filling in intact plants
Author(s) -
Haeder HansEckhard,
Beringer Helmut
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.tb04599.x
Subject(s) - potassium , peduncle (anatomy) , anthesis , plant stem , shoot , chromosomal translocation , dry weight , poaceae , chemistry , botany , horticulture , biology , agronomy , biochemistry , organic chemistry , gene , cultivar
Translocation of labeled potassium (K + ) from the root to the ear and its distribution within the culm during 4, 8 and 12 h of uptake was studied in intact wheat plants ( Triticum aestivum L. cv. Kolibri) 3 and 5 weeks after anthesis at 0.5 and 5.0 m M K + concentration in the uptake solution. Uptake of labeled K + into the shoot was proportional to the K + concentration applied. After 4 h of uptake about 2% and after 12 h about 7% of labeled K + applied to the roots were taken up into the shoot at both K + concentrations. After 12 h of uptake only 6% of the total label in the culm had reached the ear, while about 40% of the label was found in the upper three internodes. In spite of an increasing concentration of labeled K + during 12 h in the uppermost internode (peduncle), translocation of K + into the rachis was low. The low and uniform K + content found generally in grain dry weight seems therefore to be due to a controlled K + supply to the ear.