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Untersuchungen zur Translokation von Magnesium ( 28 Mg) in Sonnenblumenpflanzen
Author(s) -
Schimansky Chr.
Publication year - 1973
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19731360109
Subject(s) - sunflower , chromosomal translocation , shoot , helianthus annuus , hoagland solution , magnesium , xylem , transpiration , horticulture , chemistry , botany , biology , photosynthesis , biochemistry , gene , organic chemistry
Investigations on translocation of magnesium ( 28 Mg) in sunflower plants. 1. The translocation and retranslocation of Mg respectively 28 Mg in sunflower plants of different age have been investigated. The focus of this investigation was on the influence of the composition of the uptake solution and the age of plants on the uptake of Mg respectively 28 Mg through the roots or through the leaves and on Mg translocation (distribution). 2. After sunflower plants were grown in Mg‐deficient 1/2‐Hoagland solution Mg in the plants were redistributed. The Mg in the roots, stems, cotyledons, primary and secondary leaves was retranslocated to the youngest leaves. 3. In isolated, secondary‐rooted sunflower shoots grown in Mg‐deficient solution, plant Mg was retranslocated into the new roots and into the youngest shoots. 4. The 28 Mg‐uptake from the 0,2 mM MgSO 4 solution was usually higher than from the 1/10‐Hoagland solution. The composition of the uptake solution had little influence on the distribution of 28 Mg. Independent of the age plants had the highest 28 Mg content in the young and the lowest in the old leaves. 5. Root uptake of 28 Mg resulted in a more uniform distribution in the plant than leaf uptake. The old leaves had a higher 28 Mg content by root uptake than by leaf uptake of 28 Mg. This is probably influenced by transpiration, in combination with the xylem transport of 28 Mg after root uptake, which differs from leaf uptake and translocation in basipetal direction. 6. With increased age of plants, the content of 28 Mg/10 gr. fresh weight decreased and the difference in content between the parts of plant was higher. The decrease of Mg content in the oldest leaves was the highest. 7. The results showed that Mg was transportable in the phloem. The magnitude and the direction of Mg transport was determined as primarily through the assimilation stream, which is coupled with Mg transport in plants.