稀土镧和铈元素对西红柿幼苗生长及其根系分泌物的影响

Effects of lanthanum and cerium on growth and root exudates of tomato seedlings

稀土是具有生理活性的元素,能够对植物的生长发育产生影响,而植物根系可以对外源植物生长调节剂做出响应,调节植物生长。采用水培试验,以西红柿幼苗为材料,分析了稀土镧、铈对西红柿生长和根系分泌物的影响。结果显示,稀土元素的施加浓度为0.05 mmol/kg时,能够促进西红柿株高和叶面积的增加,浓度达到0.1 mmol/kg时则会产生抑制作用;而施加稀土元素后,植物根系生长均受到抑制作用;对西红柿根系分泌物成分和含量进行鉴定分析,稀土处理与空白组对比差异显著的代谢物共有110种,隶属于10个二级分类、38个三级分类,其中三级分类中的Fatty Acyls分类、Carboxylic acids and derivatives分类和Organooxygen compounds分类差异最为显著,但各类根系分泌物对西红柿生长的影响机理仍需要进一步的研究。

Rare earth is physiologically active elements,which can affect the growth and development of plants,and plant roots can respond to exogenous plant growth regulators and regulate plant growth.Using tomato seedings as materials,the effects of lanthanum and cerium on the growth and root exudates of tomato seedlings were analyzed by hydroponic experiment.The results showed that the application concentration of rare earth elements at 0.05 mmol/kg promoted the increase of tomato plant height and leaf area,but inhibit them when the concentration reached 0.1 mmol/kg.The application of rare earth elements inhibited the growth of plant roots.The components and contents of tomato root exudates were identified and analyzed.There were 110 metabolites with significant difference between rare earth treatment and blank group,belonging to 10 secondary classifications and 38 tertiary classifications,among which the differences among Fatty acyls class ification,Carboxylic acids and derivatives class ification and Organoxygen compounds class ification were the most significant.However,the effect mechanism of various root exudates on tomato growth still needs to be further studied.