赤霉素+2,4-D及赤霉素+丁酰肼对马缨杜鹃光合作用日变化的影响  

Diurnal variation of Rhododendron delavayi photosynthesis sparyed gibberellin+2,4-dichlorophenoxyacetic acid and gibberellin+daminozide

作　　者：徐小蓉[1] 张习敏[1] 牛晓娟[1] 唐婧[1] 乙引[1] 

机构地区：[1]贵州师范大学生命科学学院,贵州贵阳550001

出　　处：《中南林业科技大学学报》2011年第11期131-136,共6页Journal of Central South University of Forestry & Technology

基　　金：贵州省国际科技合作计划项目(黔科合外G字[2010]7025号);贵州省社发攻关项目(黔科合SY[2011]3094号);贵州省贵阳市科技计划项目

摘　　要：以贵州黔西百里杜鹃野生林中马缨杜鹃为研究对象,喷施不同浓度配比的赤霉素+2,4-D及赤霉素+丁酰肼,并测定其光合生理指标的日变化。结果表明:喷施不同浓度配比的外源激素下马缨杜鹃的光合速率呈双峰型,峰值分别出现在11:30和15:30,在11:30,赤霉素分别与不同浓度50、100、200mg/kg 2,4-D混和对应光合速率分别为8.39,8.08,8.14,8.29μmol.m-2s-1;喷施赤霉素和不同浓度的2,4-D对应的马缨杜鹃叶片蒸腾作用日变化也呈"双峰"曲线,第一个峰值均出现在9:30,表现为CK>100mg/kg+200mg/kg>100mg/kg+50mg/kg>100mg/kg+100mg/kg;与对照相比,各喷洒浓度对胞间CO2浓度的影响不明显,赤霉素和2,4-D、赤霉素和丁酰肼混合激素的喷洒对马缨杜鹃的水分利用率有一定的影响。研究结果为进一步研究马缨杜鹃的光合生理特征提供了理论依据。Different combinations of gibberellin ＋ 2,4-dichlorophenoxyacetic acid and gibberellin＋daminozide have been sprayed on Rhododendron delavayi which growth in Guizhou Qianxi Bali Azalea Forest Par, and the diurnal variation of photosynthetic physiological indexes have been determined. The results show that the photosynthetic rate had two peaks with spraying different mixed plant growth regulator, and the peak values were at 11：30 am and 15：30 pm, respectively. At the 11：30 am, the photosynthetic rate of gibberellin plus 50, 100, 200 mg/kg 2,4-D and the control were 8. 39,8. 08,8. 14,8.29 mol·m^-2s^-1 respectively. The transpiration rate of spraying gibberellin and different concentration of 2,4-D and the control showed a curve of two peaks, the first peak was at 9：30 am, the values of transpiration rate ranked from large to small as follows： CK〉100 mg/kg＋200 mg/k〉100 mg/ kg＋50 mg/kg〉100 mg/kg＋100 mg/kg. The intercellular CO2 concentration of spraying mixed plant growth regulator was not evidence. Gibberellin plus 2,4 D and gibberellin plus daminozide had an influence to water use efficiency. The results provide a basis for further research of the photosynthetic physiological character of Rhododendron delava yi.

关 键 词：马缨杜鹃 赤霉素 2 4-D 丁酰肼 光合生理指标 日变化 

分 类 号：S715.4[农业科学—林学] S718.512.2