NH4^-＋对不同基因型棉花幼苗K^-＋吸收和利用的影响  

Effects of NH_4^+ on K^+ uptake and utilization of different cotton genotypes at seedling stage

作　　者：王春霞[1] 田晓莉[1] 张志勇[1] 何钟佩[1] 段留生[1] 李召虎[1] 

机构地区：[1]中国农业大学农学与生物技术学院,北京100094

出　　处：《植物营养与肥料学报》2008年第4期742-748,共7页Journal of Plant Nutrition and Fertilizers

基　　金：国家自然科学基金项目(30100111)资助

摘　　要：在溶液培养条件下研究了NH4+对棉花不同基因型幼苗干物质积累以及K+吸收和利用的影响。结果表明,NH4+在不同供钾条件下均显著降低了棉花幼苗的干重、钾吸收量和钾利用指数,低钾条件下(K+0.03 mmol/L)尤其如此。中等供钾(K+0.5 mmol/L)在一定程度上缓解了NH4+对棉花幼苗干物质积累以及K+吸收和利用的抑制;充分供钾(K+2.5 mmol/L)却未能在中等供钾的基础上进一步减轻NH4+的毒害作用。鲁棉研22苗期的干物质积累在不同供钾条件下受NH4+影响的程度均较153018品系大,这主要与其体内钾利用能力受NH4+影响较153018大有关。In order to investigate the interaction of NH4^＋ with K^＋ in cotton seedlings, an hydroponics experiment containingthree K^＋ concentrations （0.03, 0.5, 2.5 mmol/L） combined with four NH4^＋ concentrations （0, 0.5, 2.5, 5.0 mmol/L） was conducted to examine the responses of seedling growth, K^＋ uptake and utilization to NH4^＋ with two cotton genotypes, Lumianyan 22 and 153018, differed in potassium efficiency in greenhouse. The results indicated that NH4^＋ significantly inhibited seedling growth, K^＋ uptake and utilization irrespective of K^＋ level in solution. However, K^＋ at O. 5 and 2.5 mmol/L concentration could alleviate the impact of NH4^＋ similarly, compared to O. 03 mmol/L K^＋ . For example, dry matter of Lumianyan 22 was reduced to only 76.5% of control by 0.5 mmol/L NH4^＋ under 0.03 mmol/L K^＋ , and to 88.4% and 89.2% of control under 0.5 and 2.5 mmol/L K^＋ respectively. In addition, the magnitude of the NH4^＋ effect differed among genotypes. Lumianyan 22, more sensitive to K^＋ deficiency than 153018, was affected by NH4^＋ to a larger extent than the latter. Further analysis showed that NH4^＋ had the same effect on K^＋ accumulation of Lumianyan 22 and 153018, but reduced Lumianyan 22 K utilization index more than the latter, which may have contributed to higher sensitivity of Lumianyan 22 to NH4^＋ , compared to 153018. Nevertheless, we can not conclude that there is inevitable correlation between K^＋ - sensitivity and NH4^＋ - sensitivity in cotton seedlings based on the results of this study.

关 键 词：棉花 幼苗 NH4^+ K^+ 吸收和利用 

分 类 号：S562[农业科学—作物学]