镉胁迫对不同品种烟草生理及生长状况的影响

Effects of cadmium stress on physiology and growth of different tobacco varieties

【目的】研究镉(Cd)胁迫下不同烟草品种的生理响应,为烟草Cd污染控制提供理论依据。【方法】以福建省3个主栽烟草品种翠碧1号、K326和云烟87为材料,研究不同水平Cd胁迫对烟草叶绿素含量、活性氧代谢、叶绿素荧光参数及烟草株高、生物量的影响。【结果】Cd对翠碧1号光合色素含量有促进作用,而对K326和云烟87光合色素含量有抑制作用;随Cd处理水平上升,SOD、POD活性在3个烟草品种中总体表现为先升后降,MDA含量均比对照增加,但无显著差异。烟草叶片光合反应中心的活性显著下降,Cd胁迫对K326光合活性的抑制作用最明显。低水平Cd处理促进翠碧1号和云烟87的生长,高水平Cd处理则抑制其生长;K326在不同水平Cd处理下均被抑制,在3个烟草品种中对Cd最敏感。【结论】K326和云烟87对镉胁迫较为敏感,翠碧1号对Cd胁迫的适应性较强,属较耐Cd型。

【Objective】Pot experiment was carried out to study the effects of Cd addition on physiology and the growth of three tobacco varieties.【Method】Three main tobacco varieties in Fujian,Cuibi 1,K326 and Yunyan 87,were selected to study the effects of different Cd additions on chlorophyll content,active oxygen metabolism,chlorophyll fluorescence,and height and biomass of tobacco varieties.【Result】Cd increased the content of photosynthetic pigment of Cuibi 1,while inhibited those of K326 and Yunyan 87.With the increase of Cd addition,activities of SOD and POD of three varieties increased firstly followed by a decrease.Cd addition increased MDA contents of all the three varieties without significant difference.The activity of photosynthetic reaction center in tobacco leaves decreased significantly under Cd stress and the inhibition on photosynthetic activity of K326 was the strongest.The growth of Cuibi 1and Yunyan 87 was promoted with low Cd additions whereas it was inhibited with high Cd additions.The growth of K326 was suppressed regardless of Cd additions.【Conclusion】Different tobacco varieties showed different sensitivities to Cd stress,and K326 and Yunyan 87 were more sensitive than Cuibi 1.