摘要
以抗旱型向日葵恢复系(TR5)和干旱敏感型向日葵恢复系(SR2)为材料,在开花期干旱胁迫条件下对其叶片的光合作用、叶绿素荧光参数进行比较分析,探讨不同抗旱型向日葵恢复系叶片的光合特性对开花期干旱胁迫响应的差异。试验结果表明,开花期干旱胁迫使TR5和SR2叶片的净光合速率、气孔导度和蒸腾速率呈降低的趋势,随着干旱时间的延长,降低的幅度逐渐增加,SR2降幅大于TR5。开花期干旱胁迫对TR5和SR2叶片的胞间CO2浓度影响较小。受到开花期干旱胁迫的影响,TR5和SR2的Fv/Fm呈下降的趋势,并且随着干旱时间增加,降低的幅度逐渐增加,SR2的Fv/Fm受干旱影响大于TR5。TR5和SR2的ΦPSII受开花期干旱胁迫影响均极显著降低。不同向日葵材料的ETR受开花期干旱胁迫的影响与对照相比均呈降低的趋势。TR5和SR2的NPQ在开花期干旱胁迫条件下,均呈增加的趋势,随着干旱胁迫的持续两向日葵材料叶片的NPQ增幅不断增加,但TR5的增幅小于SR2。
Use drought resistant sunflower restorer line（ TR5） and drought sensitive sunflower restorer line（ SR2） to study on photosynthetic characteristics,chlorophyll fluorescence parameters,active oxygen metabolism of leaves and dry matter accumulation and yield. To investigate the response of different drought resistant sunflower restorers to drought stress at flowering stage. The results showed that： The net photosynthetic rate,stomatal conductance and transpiration rate of TR5 and SR2 leaves decreased with the drought stress,and the decrease of SR2 was more than that of TR5. Drought stress at flowering stage had little effect on the intercellular CO2 concentration of TR5 and SR2 leaves. The Fv/Fm of TR5 and SR2 decreased with the increase of drought time,and the decrease of Fv/Fm of SR2 was more than that of TR5 by drought stress. The effects ofΦPSIIon TR5 and SR2 were significantly decreased by drought stress at flowering stage. The effects of drought stress on the ETR of different sunflower materials were decreased compared with the control. The NPQ of TR5 and SR2 increased with the drought stress at the flowering stage,and the increase of the NPQ of the two sunflower leaves increased with the drought stress,but the increase of TR5 was less than that of SR2.
出处
《辽宁农业科学》
2017年第4期1-6,共6页
Liaoning Agricultural Sciences
基金
辽宁省科学事业公益研究人才培养项目(GY2015-B-013)
国家向日葵产业技术体系建设项目(CARS-16)
关键词
向日葵
干旱胁迫
光合作用
叶绿素荧光
Sunflower
Drought stress
Photosynthesis
Chlorophyll fluorescence
