钠和铷可能是甜菜植物的营养物质。
Sodium and rubidium as possible nutrients for sugar beet plants.
机构信息
Department of Soils and Plant Nutrition, University of California, Berkeley, California 94720.
出版信息
Plant Physiol. 1967 Sep;42(9):1202-8. doi: 10.1104/pp.42.9.1202.
This study concerned the degree to which Na or Rb could substitute for K in the growth of sugar beet plants when K in the culture solution was low (1 meq/liter) or high (12 meq/liter).Sodium at high concentrations increased the growth of plants in a basal nutrient medium when either deficient in K or when adequately supplied with K alone. Redistribution of K from petioles to blades could not fully explain these results. Therefore, the essentiality of Na per se for growth of sugar beet plants may be inferred.Rubidium increased the growth of plants significantly when supplied in small doses to a nutrient medium deficient or adequately supplied with K. The amount of K added and the mode of Rb addition to solution cultures should be carefully considered when studying the effect of Rb on growth. High Rb concentrations were toxic, especially to the growth of fibrous roots.Sodium or Rb have been shown to enhance the growth of sugar beet plants under either low or high K conditions. Essentiality of either Na and/or Rb per se for growth of sugar beets may be inferred, but other criteria should be fulfilled also for conclusive proof.
本研究探讨了当培养液中 K 浓度较低（1 meq/liter）或较高（12 meq/liter）时，Na 或 Rb 替代甜菜植物生长中 K 的程度。高浓度的 Na 在 K 缺乏或单独供应 K 充足的基础营养培养基中增加了植物的生长。K 从叶柄到叶片的再分配不能完全解释这些结果。因此，可以推断 Na 本身对甜菜植物生长的必要性。当以小剂量供应给缺乏 K 或充足供应 K 的营养培养基时，Rb 显著增加了植物的生长。在研究 Rb 对生长的影响时，应仔细考虑添加的 K 量和 Rb 添加到溶液培养物中的方式。高浓度的 Rb 是有毒的，特别是对纤维根的生长有毒。已经表明，Na 或 Rb 在低 K 或高 K 条件下都能促进甜菜植物的生长。可以推断，Na 和/或 Rb 本身对甜菜的生长是必要的，但也需要满足其他标准才能得出结论性的证据。
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