钠离子向烟草木质部渗出液中的运输。
Transport of sodium into the xylem exudate of tobacco.
机构信息
Department of Agricultural Sciences, University of California, Los Angeles, 90024.
出版信息
Plant Physiol. 1972 Sep;50(3):388-90. doi: 10.1104/pp.50.3.388.
When tobacco (Nicotiana tabacum L. var. Virginia Gold) plants were pretreated with Na ((22)Na) several days before detopping, from 2.3 to 4.9% of Na previously accumulated in roots appeared in the xylem exudate in 7 days after detopping. Na from the external medium, however, was readily transported to the exudate. Moreover, the amount of the pretreatment Na that was transported to the exudate was not influenced by the presence of Na in the external medium. When Na was present in the external medium after detopping, about 4% (with an NaNO(3) post treatment) to 10% (with an NaCl post treatment) of the Na transported to the xylem in the 7 days following detopping originated in the vacuoles. Nitrate salts of K or Na in the external medium after detopping resulted in transport of large quantities of the respective cation to the exudate, but not in increased transport of the pretreatment Na. A much larger percentage of the K that was accumulated after detopping than of the Na similarly accumulated was transferred to the xylem exudate.
当烟草（Nicotiana tabacum L. var. Virginia Gold）植株在打顶前几天用 Na((22)Na)预处理时，打顶后 7 天内，先前积累在根部的 2.3%至 4.9%的 Na 出现在木质部渗出物中。然而，来自外部介质的 Na 很容易被运输到渗出物中。此外，预处理 Na 被运输到渗出物中的量不受外部介质中 Na 存在的影响。当打顶后外部介质中存在 Na 时，大约 4%（用 NaNO(3)后处理）至 10%（用 NaCl 后处理）在打顶后 7 天内被运输到木质部的 Na 源自液泡。K 或 Na 的硝酸盐盐在打顶后存在于外部介质中，导致各自的阳离子大量运输到渗出物中，但不会增加预处理 Na 的运输。与类似积累的 Na 相比，打顶后积累的 K 有更大的百分比被转移到木质部渗出物中。
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