稀土元素对甘蔗(Saccharum officinarum L.)磷素吸收、运转和代谢的影响

甘蔗分蘖期叶面喷施 30 0mg/L硝酸稀土溶液 ,以喷清水作对照 ,应用同位素示踪技术和生化分析进行研究 .结果表明 ,稀土元素处理能促进甘蔗根部及叶片对磷素 (3 2 P)的吸收和向外运转以及在生长旺盛部位的累积 ,能促进甘蔗体内无机磷向有机磷的转化 .伸长盛期喷施 30 0mg/L硝酸稀土 ,甘蔗 1叶全磷量显著增加 ,表明分蘖期后一定时期内喷施稀土仍然具有一定的生理效应 .

The Effects of Rare Earth Elements on the Absorption,Translocation and Metabolism of Phosphorus in Sugarcane Saccharum officinarum L.

The effects of rare earth elements on the absorption, translocation and metaboli sm of phosphorus were studied by using radioisotope 32 P and bioche mical analysis. Foliar spraying sugarcane with 300 mg/L rare earth nitrates at t illering stage were carried out. The results showed that the absorption of 32 P from roots and from leaves, translocation from roots to shoots and from labelled leaves to other parts of the plant, accumulation in the growing o rgans and metabolic transformation of phosphorus compounds in leaves from inorga nic to organic were promoted. Spraying of rare earth nitrates at elongating stag e the total phosphorus content of leaves increased; it showed that the rare eart h elements still had effects even if the spraying was carried out in the time af ter the tillering stage.