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黄建国, 杨邦俊, 袁玲. 小麦不同品种吸收钾离子的动力学研究[J]. 植物营养与肥料学报, 1995, 1(1): 38-43. DOI: 10.11674/zwyf.1995.0106
引用本文: 黄建国, 杨邦俊, 袁玲. 小麦不同品种吸收钾离子的动力学研究[J]. 植物营养与肥料学报, 1995, 1(1): 38-43. DOI: 10.11674/zwyf.1995.0106
Huang Jianguo Yang Bangjun Yuan Lin, . KINETICS OF K+ ABSORPTION BY VARIOUS WHEAT VARIETIES[J]. Journal of Plant Nutrition and Fertilizers, 1995, 1(1): 38-43. DOI: 10.11674/zwyf.1995.0106
Citation: Huang Jianguo Yang Bangjun Yuan Lin, . KINETICS OF K+ ABSORPTION BY VARIOUS WHEAT VARIETIES[J]. Journal of Plant Nutrition and Fertilizers, 1995, 1(1): 38-43. DOI: 10.11674/zwyf.1995.0106

小麦不同品种吸收钾离子的动力学研究

KINETICS OF K+ ABSORPTION BY VARIOUS WHEAT VARIETIES

  • 摘要: 小麦不同品种吸收钾离子(K+)的动力学参数不同。米氏常数(Km)以绵阳11最大,红矮1最小;最大吸收速率(1max)繁6最高,红芒22最低。供试小麦各品种吸收K+的补偿点(Cmin)3.44.mol/L,远低于一般土壤溶液中的K+浓度,说明土壤溶液中K+浓度与小麦吸收K+的需要相适应。此外,硝酸根(NO3)、吲哚乙酸(IAA)和稀土显著促进小麦吸收K+;但铵离子(NH4+)显著抑制K+吸收;尿素对小麦吸收K+无显著影响。动力学参数的测定表明,NH4+抑制K+吸收的原因是提高了小麦吸收K+的Km;而NO3和稀土产生促进作用的原因分别是吸收K+的Imax增加和Km减少。IAA能促进H+分泌,导致小麦吸收K+的速率提高。

     

    Abstract: A solution culture experiment indicated that wheat varieties varied in kinetic parameters of K+ absorption. The smallest values of Michealis constant for K+ absorption (Km) was found with var. Hongai 1. and maximum rate of K uptake (Imax) was found with Hongmang 22. The greatest value of km for K+ absorption was obtained with Manyang 11 and the greatest value of Imax was observed with Fan 6. The compensa-, tion concentrations for K+ uptake (Cmin3.44mol/L) by the tested wheat varieties were lower than K+ concentrations in soil solutions of commonly cultivated soils. This result showed that K+ contents in many soil solutions are adaptable to the requirement for K+ uptake by wheat. Moreover, NH4+ inhibited K+ uptake in contrast to NO3- , rare earth and indole acetic acid (IAA) which promoted K absorption. No obvious effect of urea on K+ uptake was observed. The reason for the inhibitation by NH4+ was that Km for K+ uptake was increased. The promotion by NO3- was accounted for by Imax increment. The enhancement of K+ uptake by rare earth can be explained by Km decrement. IAA Promoted H+ efflux which caused increasing in the rate of K+ uptake.

     

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