Division of Life Sciences, Negev Institute for Arid Zone Research and Department of Biology, University of the Negev, Beer Sheva, Israel.
Plant Physiol. 1972 Dec;50(6):667-70. doi: 10.1104/pp.50.6.667.
Tobacco (Nicotiana rustica) plants growing in half-strength Hoagland solution were deprived of nutrients by being transferred to distilled water. The abscisic acid content of leaves in the mineral-deprived plants rose continuously throughout the 7 days of the experimental period. However, although the content of ABA rose within 24 hours, a decline in growth and leaf-chlorophyll were discernible only after the 4th day of mineral deprivation. As anticipated, mineral-deprived (stressed) plants exhibit "resistance" to lack of aeration in the root medium, similar to that shown in salt-stressed plants or plants that were pretreated with absiscic acid. When the mineral-deprived plants were returned to half-strength Hoagland, the content of leaf abscisic acid declined to the prestressed level and the "resistance" to lack of root aeration disappeared.These results indicate that an increase in abscisic acid may be induced by conditions unfavorable to growth and not exclusively by conditions affecting the plant's water balance. In addition, the work also indicates that mineral deficiency is associated with significant modification in the hormonal balance of the plant.
在半强度 Hoagland 溶液中生长的烟草（Nicotiana rustica）植物被转移到蒸馏水中以去除养分。在实验期间的 7 天内，缺乏矿物质的植物叶片中的脱落酸含量持续上升。然而，尽管 ABA 的含量在 24 小时内上升，但只有在矿物质缺乏的第 4 天才能观察到生长和叶片叶绿素的下降。正如预期的那样，缺乏矿物质（胁迫）的植物表现出对根介质中通气不足的“抗性”，类似于盐胁迫植物或用脱落酸预处理的植物。当缺乏矿物质的植物被返回半强度 Hoagland 时，叶片脱落酸的含量下降到预胁迫水平，并且对根通气不足的“抗性”消失。这些结果表明，脱落酸的增加可能是由不利于生长的条件引起的，而不仅仅是由影响植物水分平衡的条件引起的。此外，这项工作还表明，矿物质缺乏与植物激素平衡的显著改变有关。
