Positron‐emitting tracer imaging of fluoride transport and distribution in tea plant

Abstract

Abstract BACKGROUND Tea ( Camellia sinensis (L.) O. Kuntze) is a hyper‐accumulator of fluoride (F). To understand F uptake and distribution in living plants, we visually evaluated the real‐time transport of F absorbed by roots and leaves using a positron‐emitting ( 18 F) fluoride tracer and a positron‐emitting tracer imaging system. RESULTS F arrived at an aerial plant part about 1.5 h after absorption by roots, suggesting that tea roots had a retention effect on F, and then was transported upward mainly via the xylem and little via the phloem along the tea stem, but no F was observed in the leaves within the initial 8 h. F absorbed via a cut petiole (leaf 4) was mainly transported downward along the stem within the initial 2 h. Although F was first detected in the top and ipsilateral leaves, it was not detected in tea roots by the end of the monitoring. During the monitoring time, F principally accumulated in the node. CONCLUSION F uptake by the petiole of excised leaf and root system was realized in different ways. The nodes indicated that they may play pivotal roles in the transport of F in tea plants. © 2020 Society of Chemical Industry

Plant phenotyping relevance

生きた茶植物内のフッ素輸送・分布を、18Fトレーサーと陽電子放出トレーサー画像化システムでリアルタイム取得しており、植物の生理状態を可視化する画像計測法の実質的な適用が中心です。

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