Yin Li, Liu Yong-An, Xie Cai-Yong, Jiang Xue, Wang Yong-Jie, Li Yin-Hua, Yan Zhen, Hu Ting-Xing
Sichuan Province Key Laboratory of Forestry Ecological Engineering, College of Forestry, Sichuan Agricultural University, Ya' an 625014, Sichuan, China.
Ying Yong Sheng Tai Xue Bao. 2012 Mar;23(3):632-8.
A pot experiment with controlled water supply was conducted to study the effects of different drought stress degree (80% FC, 60% FC, 40% FC, and 20% FC) and nitrogen fertilization rate (0 g x pot(-1), 1.2 g x pot(-1), 3.6 g x pot(-1), and 6.0 g x pot(-1)) on the accumulation of osmolytes in different organs of Jatropha curcas seedlings. Under drought stress, the soluble protei and free proline in seedling shoots and roots and the soluble sugar in seedling shoots had a great accumulation, and the free proline content in seedling leaves had a great increase with increasing drought stress degree. Also under drought stress, the Na+, Ca2+, and Mg2+ all highly accumulated in seedling various organs, while K only accumulated greatly in shoots but slightly in leaves and roots. The effects of nitrogen fertilization on the accumulation of osmolytes in seedlings depended on drought stress degree and nitrogen fertilization rate. At 80% FC and 60% FC, increasing nitrogen fertilization rate could markedly promote the accumulation of osmolytes in the organs of J. curcas seedlings; at 40% FC, applying 6.0 g x pot(-1) weakened the promotion effect on the osmolytes accumulation; whereas at 20%, applying 1.2 g x pot(-1) made the plants have a higher capability in osmoregulation, but applying 3.6 g x pot(-1) and 6.0 g x pot(-1) had less promotion effect, and even, inhibited osmolytes accumulation.
通过控制供水的盆栽试验，研究了不同干旱胁迫程度（80%田间持水量、60%田间持水量、40%田间持水量和20%田间持水量）和施氮量（0 g·盆⁻¹、1.2 g·盆⁻¹、3.6 g·盆⁻¹和6.0 g·盆⁻¹）对麻疯树幼苗不同器官渗透调节物质积累的影响。在干旱胁迫下，幼苗地上部和根部的可溶性蛋白质和游离脯氨酸以及地上部的可溶性糖大量积累，随着干旱胁迫程度的增加，幼苗叶片中的游离脯氨酸含量大幅增加。同样在干旱胁迫下，Na⁺、Ca²⁺和Mg²⁺在幼苗各器官中均大量积累，而K仅在地上部大量积累，在叶片和根部积累较少。施氮对幼苗渗透调节物质积累的影响取决于干旱胁迫程度和施氮量。在80%田间持水量和60%田间持水量时，增加施氮量可显著促进麻疯树幼苗各器官渗透调节物质的积累；在40%田间持水量时，施用6.0 g·盆⁻¹削弱了对渗透调节物质积累的促进作用；而在20%田间持水量时，施用1.2 g·盆⁻¹使植株具有较高的渗透调节能力，但施用3.6 g·盆⁻¹和6.0 g·盆⁻¹促进作用较小，甚至抑制了渗透调节物质的积累。
