摘要
用4种不同浓度ALA分别叶施和根灌巴西蕉幼苗后置于人工气候箱中7℃下模拟低温胁迫,研究ALA不同处理方式对巴西蕉幼苗冷害的影响。结果表明,无论叶施或根灌,ALA均可提高低温胁迫下香蕉幼苗叶片超氧化物歧化酶(SOD)、过氧化物酶(POD)活性,降低超氧阴离子产生速率、MDA含量及相对电导率,同时还可增加脯氨酸、可溶性蛋白含量及相对含水量(RWC),维持叶绿素的稳定性。以叶施0.50～5.00 mg/L ALA效果最好,与同浓度根灌相比,叶施处理的叶绿素含量均显著增加,相对电导率、丙二醛含量均显著降低,5 mg/L ALA叶施比根灌SOD和POD活性提高了64.5%、12.3%,RWC提高了12.1%,差异均达显著水平。由此表明,ALA叶面喷施可更好地减缓低温胁迫对香蕉造成的冷害。
After being foliar sprayed and root applicated with four different 5-aminolevulinic acid（ALA） concentration,Brazil banana seedlings was placed in an artificial climate box with 7 ℃ under low temperature stress to study the effects of different Exogenous ALA treatments on chilling-tolerance of banana.The results showed that treatment of foliar spraying and root application could increase significantly SOD and POD activities,decrease significantly leaves generation rate of superoxide free radical（O-2）,plasmamembrane permeability and MDA content of Brazil banana plant,and enhance significantly the content of proline and soluble protein,maintain the stability of chlorophyll.The 5-aminolevulinic acid concentration was expected to be 0.50 to 5.00 mg/L,compared with the same concentration of root application,the chlorophyll content was significantly increased,plasmamembrane permeability and MDA content were significantly reduced with treatment of foliar spraying,relative water content,SOD and POD activities of Spraying ALA treatment were increased by 12.1 %,64.5 % and 12.3 %,respectively.So it implied that foliar spraying ALA can better mitigative cold resistance of banana seedlings.
出处
《西南农业学报》
CSCD
北大核心
2012年第5期1781-1785,共5页
Southwest China Journal of Agricultural Sciences
基金
国家自然科学基金(30860170)
海南大学青年基金(qujj1160)
关键词
ALA
巴西蕉
冷害
叶施
根灌
5-aminolevulinic acid
Brazil banana
Cold damage
Foliar spraying
Root application
