叶面喷施稀土对麻楝幼苗抗寒的影响  

Cold resistance in seedlings of Chukrasia tabularis by spraying foliage with rare earth

作　　者：刘连海[1] 薛立[2] 列淦文[2] 叶龙华[2] 黄香兰[2] 

机构地区：[1]广州市园林科学研究所,广州510405 [2]华南农业大学林学院,广州510642

出　　处：《安徽农业大学学报》2012年第6期908-914,共7页Journal of Anhui Agricultural University

基　　金：广东省林业局资助项目(F09054);广东省林业科技创新专项资金项目(2010KJCX013-01)共同资助

摘　　要：以麻楝袋装实生苗为材料,叶面喷洒稀土后放入人工气候箱进行低温处理,测定其生理指标,并用主成分分析比较不同浓度稀土对幼苗抗寒性的综合影响。结果表明,0-300 mg·L-1稀土处理的幼苗相对电导率和脯氨酸含量波动,可溶性蛋白质含量多为下降,叶绿素含量保持稳定,SOD活性和MDA含量多保持稳定。500-1 000mg·L-1稀土处理的幼苗相对电导率下降,脯氨酸含量小幅增加,可溶性蛋白质含量保持稳定或小幅下降,叶绿素含量普遍小幅增加,SOD活性多保持稳定,MDA含量减少或保持稳定,表明高浓度稀土处理有效提高了苗木的抗寒能力。用主成分分析对各浓度稀土处理的幼苗抗寒性进行评价,得出处理幼苗的稀土浓度对幼苗抗寒排序为1 500mg·L-1>1 000 mg·L-1>700 mg·L-1>500 mg·L-1>300 mg·L-1>100 mg·L-1>50 mg·L-1>0 mg·L-1。Seedlings of Chukrasia tabularis were treated with seven concentrations of rare earth solution by foliage spraying, and then they were treated by low temperature of 6 ℃ using artificial climate box. The effect of low temperature stress on physiology of the seedlings was tested, and their cold resistance was evaluated using principal component analysis. The results showed that with lapse of low temperature, relative conductivity and protein content of the seedlings treated with rare earth of 0-300 mg.L-1 fluctuated, their soluble protein generally increased and chlorophyll content kept steady, the activity of SOD and MDA content generally kept steady. Relative conductivity of the seedlings treated with rare earth of 500-1500 mg.L-1 decreased, their protein contentincreased slightly, soluble protein kept steady or increased slightly, chlorophyll content increased slightly, the activity of SOD generally kept steady and MDA content decreased or kept steady, which indicated that cold resistance ability of the seedlings treated with high content rare earth increased. The cold resistance of seedlings treated with seven concentrations of rare earth solution was evaluated using principal component analysis, and the order of concentration was 1 500 mg·L-1 〉 1000 mg.L-1〉700 mg·L-1〉500 mg.L-1〉300 mg·L-1〉 100 mg·L-1〉50 mg·L-1 〉0 mg·L-1.

关 键 词：麻楝 稀土 低温处理 抗寒 主成分分析 

分 类 号：Q945.79[生物学—植物学] S718.43[农业科学—林学]