摘要
冻害是影响和限制枇杷生产和发展的主要因素。本试验以"早钟6号"枇杷为试材,采用人工降温的方法,测定接种冰核细菌后,枇杷叶片光合参数和叶绿素荧光动力学参数变化。结果显示:冰核细菌的存在能显著降低低温胁迫下枇杷叶片的Pn、Fm、Fv、Fv/Fo、Fv/Fm和水分利用效率,说明冰核细菌加重了低温对枇杷叶片光合机构的破坏性,加重冻害发生。在接种冰核细菌条件下,-3℃比-1℃Pn、Fm、Fo、Fv、Fv/Fo和Fv/Fm降低更显著且时间提前,说明温度愈低,冰核细菌对光合系统的破坏愈重且冻害发生时间提前。另外,Tr与冰核细菌的存在无显著相关性。
Freezing injury is a major factor that influences and restricts loquat’s production and development. In this experiment, the effects of INA （ice nucleation active） bacteria inoculation on photosynthetic and chlorophyll fluorescence parameters of the leaves of ＂Zaozhong No.6＂ loquat under low temperatures were investigated. The results show that INA bacteria significantly reduces Pn, Fm, Fv, Fv/Fo, Fv/Fm and water use efficiency under low temperature. This indicates that INA increases degradation of photosynthetic apparatus, which in turn limits photosynthetic activities under low temperatures. INA bacteria inoculation under-3 ℃ more significantly and earlier influences Pn, Fm, Fo, Fv, Fv/Fo and Fv/Fm than under-1 ℃. This implies that the lower the temperature, the greater and the earlier the damage caused by INA bacteria to photosynthetic system. Furthermore, it is noted that Tr is not associated with the presence of INA bacteria.
出处
《中国生态农业学报》
CAS
CSCD
北大核心
2010年第6期1251-1255,共5页
Chinese Journal of Eco-Agriculture
基金
国家科技支撑计划项目(2007BAD07B06-3)资助
关键词
枇杷
冰核细菌
光合参数
叶绿素荧光
冻害
Loquat
Ice nucleation active bacteria
Photosynthetic parameter
Chlorophyll fluorescence
Freezing damage
