镁、钾相互作用对水稻生长、养分吸收及有关生理特性的影响  

Effect of magnesium and potassium interaction on growth,nutrient uptake and related physiological characteristics of rice

作　　者：丁玉川[1] 罗伟[1] 徐国华[1] 

机构地区：[1]南京农业大学资源与环境科学学院

出　　处：《中国生态农业学报》2008年第2期340-344,共5页Chinese Journal of Eco-Agriculture

基　　金：国家自然科学基金项目(30471037);高校博士点专项基金项目(20040307037)资助

摘　　要：在温室条件下,采用液体培养方法研究了Mg、K相互作用对水稻生长、养分吸收以及有关生理特性的影响。结果表明,在低Mg浓度条件下,水稻植株干物质积累随K浓度增加而减少;在高Mg条件下水稻植株干物质积累随K浓度增加而相应增加。在低Mg条件下,高浓度K显著抑制植株对Mg、K、N和P的吸收;在高Mg浓度下,植株对Mg、K、N和P的吸收有促进作用。植株叶片叶绿素含量在低Mg条件下随K浓度增加而减少,在高Mg条件下K浓度增加对叶绿素含量无显著影响。叶片硝酸还原酶活性和可溶性蛋白质含量随Mg浓度增加而增加,而K浓度增加对叶片硝酸还原酶活性和可溶性蛋白质含量无明显影响。高Mg条件下的叶片可溶性糖和淀粉含量明显高于低Mg处理,并随K浓度增加而提高。Mg、K营养拮抗作用主要表现在低Mg高K浓度条件下抑制Mg的吸收。A greenhouse hydroponics culture experiment was carried out to study the effects of Mg and K interaction on plant growth, nutrient uptake, and related physiological characteristics of rice （ Oryza sativa L. cv. Wuyunjing 7）. The results show that with increasing K concentration of nutrient solution, dry plant weight reduces with low Mg concentration. This trend, howev- er, reverses with higher Mg concentration. Uptake of Mg, K, N and P are remarkably restrained by higher K concentration with low Mg supply, while higher Mg concentration correspondingly enhances uptake of Mg, K, N and P. Leaf chlorophyll content de- creases with increasing K concentration under low Mg condition. It is not significantly influenced by increasing K concentration when high concentration of Mg is supplied. With increasing Mg concentration, nitrate reductase （NR） activity and total soluble protein content increase, but not evidently enhanced with increased K concentration. Soluble sugar and starch contents of leaves are higher at high Mg concentration than at low Mg supply. Furthermore, soluble sugar and starch contents increase with increased K concentration. The study demonstrates that significant interaction between Mg and K restrains Mg uptake in low Mg with high K supply in rice.

关 键 词：Mg  K相互作用 水稻 养分吸收 生理特性 

分 类 号：S147.34[农业科学—肥料学]