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It is not clear how the xylem of a plant organ with a low transpiration rate, such as the grapevine (Vitis vinifera L.) bunch, is anatomically linked to surrounding leaves. The aim was to test the hypothesis that xylem connections to the grapevine bunch are sectorial using an apoplastic dye and a radioactive membrane-permeable nutrient analogue. The transport of eosin and pertechnetate ( 99m ...
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