NaHCO_3胁迫下四倍体白桦苗木光合特性分析  

Photosynthesis of Autotetraploid Betula platyphylla Seedling Responding to NaHCO_3 Stress

作　　者：穆怀志[1] 林琳[2,3] 于建国 李爽[1] 姜效龙 夏富才[1] 

机构地区：[1]北华大学林学院,吉林吉林132013 [2]中国林业科学研究院寒温带林业研究中心,黑龙江哈尔滨150086 [3]国家林业局哈尔滨林业机械研究所,黑龙江哈尔滨150086 [4]吉林市龙潭区新山苗木专业合作社,吉林吉林132206

出　　处：《北华大学学报（自然科学版）》2017年第1期25-29,共5页Journal of Beihua University（Natural Science）

基　　金：中央财政林业科技推广示范资金项目(JLT201615);吉林省教育厅科学技术研究项目(2015139);北华大学博士科研启动基金项目

摘　　要：采用NaHCO_3胁迫处理四倍体白桦苗木,测定其光响应曲线、CO_2响应曲线和叶绿素荧光.结果表明:NaHCO_3胁迫后,四倍体白桦的光饱和点(LSP)、表观量子产量(AQY)、CO2饱和点(CSP)和羧化效率(CE)显著高于二倍体,分别提高19.25%,26.92%,13.14%和92.09%;PSII最大光化学效率(Fv/Fm)、PSII实际光化学效率(ФPSII)和光化学淬灭(q P)差异显著,较二倍体分别提高7.92%,20.05%和24.63%.由此表明,NaHCO_3胁迫下四倍体白桦的光合作用强于二倍体.To evaluate the impact of intraspecies genome duplication on NaHCO_3 stress,a series of Betula platyphylla autotetraploids and diploids were generated from the same family. The light response curve,CO_2 response curve and chlorophyll fluorescence of these autotetraploid individuals were compared with those diploid trees. There were significant variations in light saturation point（ LSP）,apparent quantum yield（ AQY）,CO_2 saturation point（ CSP） and carboxylation efficiency（ CE） between autotetraploids and diploids after NaHCO_3 irrigated.The LSP,AQY,CSP and CE of autotetraploids were 19.25%,26.92%,13.14% and 92.09% greater than those of diploids,respectively. Chlorophyll fluorescence data revealed autotetraploids were significant higher in PSII maximal photochemical efficiency（ Fv/ Fm）,PSII actual photochemical efficiency（ ФPSII） and photochemical quenching（ q P）.After NaHCO_3 irrigated,Fv/ Fm,ФPSIIand q P of autotetraploids were 7.92%,20.05% and 24.63% greater than those of diploids,respectively. These results demonstrate that the photosynthesis of B.platyphylla autotetraploids is more active than that of diploid individuals in NaHCO_3 stress.

关 键 词：白桦 四倍体 光合作用 盐胁迫 

分 类 号：S722.35[农业科学—林木遗传育种]