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采用盆栽控水的方法,研究干旱胁迫(80%FC、60%FC、40%FC和20%FC)及施氮(N00 g.pot-1、Nl1.2 g.pot-1、Nm3.6 g.pot-1和Nh6.0 g.pot-1)对麻疯树幼苗叶、茎和根部主要渗透调节物质积累的影响.结果表明:干旱胁迫条件下,麻疯树幼苗茎和根部的游离脯氨酸、可溶性蛋白和茎部可溶性糖大量积累,叶片中脯氨酸含量也随干旱胁迫程度的增加大幅度上升;Na+、Ca2+和Mg2+在麻疯树幼苗叶、茎和根中大量积累,而K+仅在茎中大量积累,叶片和根部K+含量略微上升.施氮对植株渗透调节物质的影响与干旱胁迫强度和施氮水平有关.在80%FC和60%FC水分条件下,增加N肥施用量能明显促进麻疯树幼苗各组分渗透调节物质的积累;在40%FC水分条件下,Nh处理对渗透调节物质积累的促进作用减弱;而在20%FC条件下,Nl处理植株的渗透调节能力较高,Nm和Nh处理对植株渗透调节的促进作用不明显甚至转为抑制.
The effects of drought stress (80% FC, 60% FC, 40% FC and 20% FC) and nitrogen fertilizer (N00 g.pot-1, Nl1.2 g.pot-1, Nm3.6 g.pot-1 and Nh6.0 g.pot-1) on the accumulation of major osmolytes in leaves, stems and roots of Jatropha curcas seedlings.The results showed that under drought stress, the stems and roots of Jatropha curcas seedlings were free Proline, soluble protein and stem soluble sugar accumulation, Proline content in leaves also increased with the increase of drought stress; Na +, Ca2 + and Mg2 + accumulation in leaves, stems and roots of Jatropha curcas seedlings, While K + accumulated only a large amount in the stems and K + content in leaves and roots slightly increased.The effects of nitrogen application on osmotic adjustment of plants were related to the intensity of drought stress and nitrogen application.When the water content of 80% FC and 60% FC increased, N Fertilization could significantly promote the accumulation of osmolytes in each component of Jatropha curcas seedlings. Under the condition of 40% FC water, Nh treatment had less effect on the accumulation of osmotica; however, under the condition of 20% FC, The osmotic adjustment ability of Nm and Nh treatments was not obvious or even inhibited.