低pH条件下钾对液培甘蔗幼苗生长及根系形态的影响  

Effects of Different Potassium Levels on Growth and Root Morphological Traits of Sugarcane Seedling under Low p H Hydroponic Culture

作　　者：陈迪文[1] 黄莹[1] 卢颖林[1] 敖俊华[1] 周文灵[1] 黄振瑞[1] 江永[1] CHEN Di-wen HUANG Ying LU Ying-lin AO Jun-hua ZHOU Wen-ling HUANG Zhen-rui JIANG Yong(Guangdong Provincial Bioengineering Institute （Guangzhou Sugarcane Industrial Research Institute）/Guangdong Key Lab of Sugarcane Improvement ＆ Bio-Refinery, Guangzhou 510316)

机构地区：[1]广东省生物工程研究所(广州甘蔗糖业研究所)广东省甘蔗改良与生物炼制重点试验室,广东广州510316

出　　处：《甘蔗糖业》2016年第6期18-21,共4页Sugarcane and Canesugar

基　　金：广东省自然科学基金(2016A030313416);广东省科技发展专项资金项目(2014B070705002);国家现代农业产业技术体系甘蔗专项(CARS-20-3-1)

摘　　要：本研究采用液培方法模拟在低pH条件下,不同钾水平(0.1、3、6 mmol/L)对甘蔗幼苗生长及根系形态的影响。研究结果表明,在低pH液培条件下供钾不足时(0.1 mmol/L),甘蔗幼苗干物质量下降,株高降低,根冠比增大,根系形态参数包括根总长、根平均直径、根总表面积与根总体积均显著减小,根系活力下降,植株钾含量降低。当钾水平提高到3 mmol/L时则可以恢复正常生长,但当钾水平继续升高到6 mmol/L时则会减少根总长与根总体积,对根系生长不利。A hydroponic experiment was conducted to investigate the effect of different potassium levels （0.1, 3 and 6 mmol/L） on the growth and the root morphology of sugarcane seedling under low pH. The results showed that, under 0.1 mmol/L potassium level in the low pH （4.0） of nutrient solution, the dry matter and the plant height decreased; the total length, average diameter, total average superficial area and total volume of the roots significantly decreased; the root activity and potassium content in plant also decreased, and the root-shoot ratio increased. The seedling returned to normal growth when the potassium level increased to 3 mmol/L, while both the total length and the total volume decreased at 6 mmol/L potassium level, which were harmful to the root normal growth.

关 键 词：低PH 甘蔗 钾 根系形态 液培 

分 类 号：S566.1[农业科学—作物学]