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- W2045438402 abstract "Putrescine uptake and translocation were studied by feeding [3H] putrescine to roots of tomato seedlings (Lycopersicon esculentum Miller, cv. Earlypak 7) at the stage of expanded cotyledons, of maize seedlings (Zea mais L.) at the coleoptile stage, and of one year old pines (Pinus pinea L.). Putrescine translocation was rapid as radioactivity appeared in the upper part of the seedlings within 30 min, continuing to increase up to 24 h, while it decreased in roots. The putrescine supplied was partly metabolized to spermidine and spermine in the course of 24 h. The transport was temperature-dependent as it increased with increasing temperature from 4°C to 30°C. In plants kept in 100% relative humidity the transport decreased by 27% compared to controls kept in 50% relative humidity. The existence of basipetal transport was assessed by feeding labeled putrescine to cotyledons or to a primary leaf of tomato plants at different stages of growth. The influence of ringing at the hypocotyl level on polyamine translocation in pine plants was studied in order to exclude cortical parenchyma and phloem from transport. Radioactivity decreased in the hypocotyl just above the ring and in the upper parts (epicotyls with needles), but long-distance transport was low affected indicating xylem transport. It is suggested that polyamine transport is not polar, and that it occurs mainly through xylem vessels." @default.
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- W2045438402 date "1989-10-01" @default.
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- W2045438402 title "Putrescine uptake and translocation in higher plants" @default.
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- W2045438402 doi "https://doi.org/10.1111/j.1399-3054.1989.tb04973.x" @default.
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