不同供硫水平下烟草硫营养及对N、P、Cl等元素吸收的影响

EFFECT OF SULPHATE RATES SUPPLIED ON SULPHUR METABOLISM AND N, P AND Cl ABSORPTION IN TOBACCO

对不同供硫水平下烟草生长发育及硫营养吸收、代谢进行了研究。结果表明 ,缺硫烟草生育期推迟 ,甚至不能现蕾 ;株高、茎粗、叶片长和宽、干重、根系生物量均明显低于较正常供硫植株。烟草能耐高浓度外界硫供给 ,完成生育期 ,但茎粗、叶宽显著低于正常供硫处理。随着供硫水平增加至正常 ,烟草植株全硫含量迅速升高 ,过量供硫下 ,植株继续奢侈吸收大量硫 ,含量可达到 14 10 g/kg。植株全硫的增加 ,极少量以氨基酸硫形态增加 ,大分子蛋白质硫含量基本保持不变 ,其余大多数以硫酸盐形态存在。全硫与无机硫含量呈极显著正相关 (r =0 9713 )。硫与氮的吸收和代谢相互促进和抑制 (r =0 6 136 ) ,缺硫和过量硫均抑制植株对磷的吸收 ,而随着供硫增加体内氯含量一直下降。

The effects of sulphate rates supplied on the growth, development and sulphur absorption, metabolism of tobacco ( Nicotiana tobacum var. NC89) were studied in this paper. The results showed that sulfur deficiency retarded tobacco growth, delayed flowering emergence, and got much less plant height, stem diameter, leaf length, leaf width, leaf area and dry weight, etc. than those of normal sulfur nutrition plants. Tobacco plants could suffer very higher sulfate rate applied although the stem diameter and leaf widths were adversely affected. The total sulfur contents increased greatly with the increment of sulfur supply, up to 14 10g/kg under the highest sulfur rate tested. The inorganic sulfur accounted for a large proportion of the total sulfur increase and sulfur in amino acids only for a little fraction of it. Sulphur in protein held the line as the increase of sulfur supply. The correlation analysis showed that the inorganic sulfur contents positively correlated very significantly with total sulfur contents(r=0.9713 ** ). Sulfur and nitrogen promoted and inhibited each other. Both sulfur deficiency and sulfur surplus inhibited the absorption of phosphorus, but the contents of chloride declined straightly with the increase of sulfur supply.