植物营养与肥料学报2011,17(2)：384-390 Plant Nutrition and Fertilizer Science
低钾胁迫下不同低钾耐性大豆光合特性及
保护性酶的差异
李兴涛，王伟，李晨，王晓光，赵洪祥，曹敏建“
（沈阳农业大学农学院，辽宁沈阳110161）
异。结果表明，与施钾相比，低钾胁追下，两类品种的相对叶绿素含量（SPAD值）、净光合速率（Pn）和气孔导度升高，且低钾敏感品种比低钾耐性品种升高幅度大。低钾耐性品种SOD活性在开花期低于低钾敏感品种，成熟始期又明显高于低钾敏感品种；CAT活性在开花期和结英期低钾耐性品种都高于低钾敏感品种；成熟始期POD活
性低钾耐性品种下降的幅度小于低钾敏感品种；MDA在生育中后期，低钾耐性品种明显低于低钾敏感品种。关键词：低钾胁追；钾耐性；大豆；光合特性；活性氧代谢
中图分类号：S565.1.01；Q945.78
文献标识码：A
文章编号：1008505X(2011)02-0384-07
Photosyntheticcharacteristicsandprotectiveenzymeactivitiesofdifferent
low K-tolerance soybean varieties under low potassium stress LI Xing-tao, WANG Wei, LI Chen, WANG Xiao-guang, ZHAO Hong-xiang, CAO Min-jian
(Agronomy College, Shenyang Agricultural Unieersity, Shenyang ll0161, China)
Abstract: Potassium (K) is the most important cation in plants, which plays an important role in plant growth, metabolism and yield. K deficient soils are common world-wide, and their widespread occurrence in the crop growing regions of northeastem China has been recognized in these years. Nowadays, the occurrence of K deficien-cy in soybean (Glycine max L.), the most important oil crop in northeastem China, has increased. This paper presents the responses of photosynthetic characteristics and active oxygen metabolism of four Ktolerance soybean varieties, Shennong 6(SN6) and GD1617 as tolerant and Tiefeng 31(TF31) and Tie 95068 5(T95068 5) a8 sensitive, to low potassium stress under field condition from seedlings to maturity stage. The results showed that the leaf net photosynthetic rate (Pn), chlorophyll (Chl) content and stomatal conductance (Gs) of Ktolerant varie ties decreased under low potassium stress, but compared with the sensitive varieties, the tolerant varieties decreased less, while intercellular CO, concentration (Ci), transpiration rate (Tr) and content of praline content increased with sensitive verities increased more. The SOD activities of tolerant varieties were lower than those of sensitive one at flowering stage, while higher at maturity stage. The CAT activities of tolerant varieties were significant higher than those of sensitive varieties at both flowering and podding stages. The POD activities of tolerant varieties were significantly higher than those of sensitive varieties in maturity stage. In latter stage, the contents of MDA of toler-ant varieties were lower than those of sensitive varieties.
Key words: low potassium stress; different Ktolerance; soybean varieties; photosynthetic characteristics;
active oxygen metabolism
收稿日期：2010-04-21
接妥日期：2010-10-01
（60100）（01900）（0
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