• ISSN 1008-505X
  • CN 11-3996/S
杨瑛, 马梅, 郑青松, 刘兆普, 郭世伟. 不同供氮形态下油菜幼苗对盐胁迫的响应[J]. 植物营养与肥料学报, 2012, 18(5): 1229-1236. DOI: 10.11674/zwyf.2012.11492
引用本文: 杨瑛, 马梅, 郑青松, 刘兆普, 郭世伟. 不同供氮形态下油菜幼苗对盐胁迫的响应[J]. 植物营养与肥料学报, 2012, 18(5): 1229-1236. DOI: 10.11674/zwyf.2012.11492
YANG Ying, MA Mei, ZHENG Qing-song, LIU Zhao-pu, GUO Shi-wei. Response of canola seedlings to salt stress under different nitrogen forms[J]. Journal of Plant Nutrition and Fertilizers, 2012, 18(5): 1229-1236. DOI: 10.11674/zwyf.2012.11492
Citation: YANG Ying, MA Mei, ZHENG Qing-song, LIU Zhao-pu, GUO Shi-wei. Response of canola seedlings to salt stress under different nitrogen forms[J]. Journal of Plant Nutrition and Fertilizers, 2012, 18(5): 1229-1236. DOI: 10.11674/zwyf.2012.11492

不同供氮形态下油菜幼苗对盐胁迫的响应

Response of canola seedlings to salt stress under different nitrogen forms

  • 摘要: 为比较不同供氮形态下油菜对盐胁迫的响应,通过供应铵态氮和硝态氮,探讨盐胁迫对油菜幼苗生物量、 光合作用、 离子含量等的效应。结果表明: 非盐胁迫条件下的硝态氮处理的植株生物量和叶片光合参数均显著高于其它处理; 在盐胁迫条件下,两种供氮形态处理油菜的生长和光合均受到明显抑制,其中铵态氮处理表现的抑制效应较显著,且其光合抑制主要来自气孔限制。在两种供氮条件下,盐胁迫使得植株Na+浓度均显著增加,其中铵态氮处理的叶片和叶柄中Na+浓度的增幅大于硝态氮处理,而其根中Na+浓度则小于硝态氮处理。盐胁迫导致两种供氮形态下整株和叶柄中K+浓度均显著降低,而在根中,则只造成硝态氮处理的K+浓度的显著降低。在整株水平上,盐胁迫下铵态氮处理的K+ 、 Na+的选择性比率(SK,Na)要显著低于硝态氮处理。综上,在盐胁迫条件下,硝态氮处理对K+吸收维持较高的相对选择性是其耐盐性高于铵态氮处理的重要原因。

     

    Abstract: In order to study different nitrogen forms on the responses of canola plants to salt stress, the effects of the salt stress on growth, photosynthesis, and ions absorption and distribution of canola plants were investigated by supplying with ammonium and nitrate in nutrient solution. The results showed that the total dry mass and photosynthesis of canola plants supplied with nitrate and no NaCl was higher than those of the other treatments. Under the NaCl stress, there was a significant inhibition of growth of canola plants supplied with two nitrogen forms, but the inhibition was greater in canola plants supplied with ammonium than that supplied with nitrate. The inhibition of photosynthesis was mainly attributed to stomatal limitation in this experiment. Under the NaCl stress, there were significant increases of Na+ concentration in canola plants supplied with two nitrogen forms. In the leaf blades and petioles, the Na+ concentrations increased more sharply in canola plants supplied with ammonium than those supplied with nitrate. However, in roots, the greater increase was found in canola plants supplied with nitrate. Under the NaCl stress, the K+ concentrations in the whole plants and petioles declined remarkably supplied with two nitrogen forms. In roots, a significant decline of K+ concentration was found in canola plants supplied with nitrate, while the decline was not found in canola plants supplied with ammonium. Selectivity ratio of K+ and Na+ (SK,Na) in roots of canola plants supplied with ammonium was higher than that supplied with nitrate, while in petioles and the whole plants, SK,Na was higer in canola plants supplied with nitrate. To sum up, under the salt stress, the more salt tolerance of canola plants supplied with nitrate can be attributed to greater selectivity of K+ at whole plant level.

     

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