富钾基因型烤烟根系形态和生理特性研究

在水培条件下,以富钾基因型烤烟'农大202'和一般型品种'NC89'、'净叶黄'为材料,研究了不同供钾水平下烟草根系形态和生理特性的基因型差异.结果显示:与低钾水平相比,各品种烤烟在常钾水平下的根系鲜重、体积、干重、总吸收面积、活跃吸收面积、比表面积、根系活力、H+分泌量、阳离子交换量(CEC)、可溶性蛋白和ATPase活性均明显升高,但根系比表面积有所下降,并以'农大202'烤烟的变化幅度较大;在常钾水平下,'农大202'表现出良好的根系形态和较强的生理特性,但其在低钾胁迫下却低于一般型品种,耐低钾能力较弱.研究表明,烟草的根系形态和生理特性及其对环境供钾水平的响应存在明显的基因型差异;提高环境供钾水平能明显促进各基因型烟草根系的形态发育和生理活性,从而增强其对钾的吸收、转运能力.

Morphological and Physiological Characteristics of Root in Potassium-enriched Flue-cured Tobacco Genotype

Three different genotypes of flue-cured tobacco including one potassium-enriched cultivar 'Nongda 202' and two common cultivars,'NC89' and 'Jingyehuang',were used to investigate the differences of root morphology and physiology in solution culture under low K and normal K supply condition.The results indicated that:comparing with low K supply condition,the indices of root morphology and physiology including root fresh weight,root volume,root dry weight,root vigor and total vigor,total uptake area,active upt...