Distribution and partitioning of newly taken-up boron in sunflower

Distribution and partitioning of newly acquired boron (B) in a mature sunflower (Helianthus annuus L., cv. 3101) plant was investigated. In leaf blades of sunflower plants grown under 0.93, 2.8, and 9.3 mmol B m-3, the level of cell-wall-bound B was rather uniform, irrespective of leaf position and...

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Bibliographic Details
Published in:Plant and soil 2005-12, Vol.278 (1-2), p.351-360
Main Authors: Matoh, T, Ochiai, K
Format: Article
Language:English
Subjects:
Absorption. Translocation of ions and substances. Permeability
Agronomy. Soil science and plant productions
Biological and medical sciences
Bleeding
Boron
Economic plant physiology
Fundamental and applied biological sciences. Psychology
Helianthus
Helianthus annuus
Leaf blade
Leaves
Nutrition. Photosynthesis. Respiration. Metabolism
oil crops
Phloem
Plant anatomy
Plant roots
Plants
Sunflowers
tissue distribution
uptake mechanisms
Xylem
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Summary:Distribution and partitioning of newly acquired boron (B) in a mature sunflower (Helianthus annuus L., cv. 3101) plant was investigated. In leaf blades of sunflower plants grown under 0.93, 2.8, and 9.3 mmol B m-3, the level of cell-wall-bound B was rather uniform, irrespective of leaf position and B concentration. Boron concentration gradients among leaf positions were produced mainly by different levels of water-soluble B. To determine the distribution of newly taken-up B in plant parts, l0B-labeled boric acid at a concentration of 2.8 mmol B m-3 was applied. The majority of newly acquired B was delivered to the younger leaves, however, approximately one-fourth of the B in the top and second leaves was the older B which was taken up before the 6 d treatment period. In the root tissues, two-fifth of the water-soluble B was new B taken up in the last 6 d, however, within 6 h of the application new B contributed to approximately 80% of the xylem sap B, suggesting that newly taken-up B is preferentially transported to the shoots. When B was withdrawn from the culture solution, the B concentration per leaf area of the lower leaves decreased slightly over 9 d. However, there was an abrupt decrease in the younger leaves, even when taking into account the rapid expansion of the leaf blade, suggesting that B moves more rapidly from the younger leaves than from the older leaves
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-005-0372-2