Uptake and distribution of65Zn and54Mn in wheat grownat sufficient and deficient levels of Zn and Mn

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Abstract
The uptake and distribution of 65Zn and 54Mn by wheat (Triticum aestivum cv. Aroona) was investigated. Plantswere grown in a chelate-buffered nutrient solution with either sufficient Zn and Mn, low Zn or low Mn. A single representative seminal root from 14-d-old and 42-d-old plants was dual-labelled with 65Zn and 54Mn. The 14-d-old plants were harvested every 10 min from 10–140 min of labelling, whilst the 42-d-old plants were harvested after 2 h of labelling. At harvest, each plant was separated into leaves, main stem, unexposedroots, and tillers. In addition, the crown was separatedfrom the stem in the 14-d-old plants In the control plants labelled at 14 d, 65Zn was firstdetected and accumulated in the crown of the roots after 40–60 min. Labelled Zn was then detected in the stem, followed by the leaves. The oldest and youngest leaves received less 65Zn than the second and third oldest leaves. The plants grown under low Zn conditions accumulated more 65Zn in their older leaves and transferred 63Zn to the unexposed roots. Distribution of 54Mn was similar in the controls to that of 65Zn, except the older leaves received no HMn, At the second harvest, a similar distribution pattern of 65Zn and 54Mn was observed with regard to leaf age. Large amounts of 65Zn and 54Mn were detected within the unexposed roots of all treatments. It is suggested that the distribution of root-supplied Zn and Mn may be determined by micronutrient status and its relationship with leaf transpiration rates.

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