Cd、Fe及其复合污染对烟草叶片几项生理指标的影响

本文通过盆栽和大田模拟试验,研究了Cd,Fe,Cd+Fe,Fe+Cd处理下烟草红花大金元(Nicotiana tabacurm L.)叶片的几项生理指标的变化情况。试验表明:烟草叶片叶绿素a、叶绿素b、叶绿素a+b含量均随Cd处理浓度的增加而下降,随Fe处理浓度的增加而上升。总烟碱含量随Cd处理浓度的增加(0—100ppm)而下降,Cd 150ppm时略有上升,随Fe处理浓度的增加而上升。蛋白质含量随Cd处理浓度的增加而上升,随Fe处理浓度的增加而下降。烟草的3个生理指标表明,Cd抑制Fe对生理指标的作用,Fe抑制Cd对它们的作用,Cd与Fe相互拮抗。Cd处理的烟草叶片过氧化物酶活性和细胞膜透性的测定结果表明,过氧化物酶活性和细胞膜透性均随Cd处理浓度的增加而上升。

EFFECTS OF CADMIUM AND IRON ON THE SOME PHYSIOLOGICAL INDICATORS IN LEAVES OF TOBACCO

Based on the pots and simulated field experiments, this paper provided information about the changes of some physiological indicators in leaves of tobacco Nicotiana tabacum under the tretment of single Cd, single Fe, Cd+ Fe and Fe+Cd. The results showed the contents of chlorophyll a, chlorophyll b and chlorophyll a + b in leaves of tobacco decreased with the increase of the concentration of Cd, and increased with the increase of the concentration of Fe. The contents of nicotine decreased with the increase of the concentration of Cd( 0-100ppm), and increased a little by Cd 150ppm, and increased with the increase of the concentrationt of Fe. The contents of protein increased with the increase of the concentration of Cd, and decreased with the increase of the concentration of Fe.Therefore, the effect of Cd on chlorophyll, nicotine and protein decreased by Fe, the effect of Fe on them decreased by Cd. The interaction between Cd and Fe was antagonistical, antagonistical mechanism have been frequently investigated.Besides, We researched the changes of the activity of peroxidase and CMP in leaves of tobacco under the treatment of single Cd. The results showed the activity of peroxidase and CMP increased with the increase of the concentration of Cd.