两种绣线菊耐弱光能力的光合适应性  

Photosynthetic adaptability of the resistance ability to weak light of 2 species Spiraea L.

作　　者：刘慧民[1] 马艳丽[1] 王柏臣[2] 杨涛[1] 车艳双[1] 邢艳秋[1] 车代弟[1] 

机构地区：[1]东北农业大学园艺学院,哈尔滨150030 [2]东北林业大学,哈尔滨150040

出　　处：《生态学报》2012年第23期7519-7531,共13页Acta Ecologica Sinica

基　　金：国家自然基金资助项目(31172002);第48批中国博士后基金资助项目(415152);黑龙江省博士后基金项目(LBH\Z09288);黑龙江省教育厅2010年资助项目(11551040);东北农业大学2009年度博士启动项目

摘　　要：研究彩色叶花灌木金山绣线菊(Spiraea bunmalba‘Goldmound’)、金焰绣线菊(Spiraea bunmalba‘Goldflame’)对弱光胁迫的光合适应能力,分析其弱光处理及恢复过程中光合特性的变化,探讨其对弱光环境的光合生理适应性变化,为绣线菊在城市园林不同光照环境中得到科学应用提供参考。2种绣线菊具明显光合日变化规律,光强为自然光照60%—65%、40%—45%时光合速率日变化为双峰型曲线,第1峰值高于第2峰值,有明显光合"午休"现象,光强为自然光照20%—25%时光合速率日变化为单峰型曲线,无明显光合"午休"现象;2种绣线菊最大净光合速率、光补偿点、光饱和点、最大表观量子效率和暗呼吸速率随处理光强减弱而减小;叶绿素(a+b)、类胡萝卜素含量随处理光强减弱而增加,叶绿素a/b值随处理光强减弱而降低;随处理光强减弱2种绣线菊叶片变薄,上、下表皮细胞变小,栅栏组织、海绵组织厚度变薄,海绵组织细胞间隙变大,2者比值减小;2种绣线菊弱光胁迫均产生低分子量(45.0—66.2 kDa)特异表达蛋白,推测为弱光胁迫诱导蛋白。2种绣线菊经60%—65%、40%—45%弱光处理后具一定恢复能力,光强仅为自然光照20%—25%处理时其恢复能力较弱。栅栏组织与海绵组织厚度比值、叶绿素a/b值和最大净光合速率是评价2种绣线菊耐弱光能力的重要指标,叶绿素a/b值与耐弱光能力显著负相关,栅栏组织与海绵组织厚度比值、最大净光合速率与耐弱光能力显著正相关,2种绣线菊耐弱光能力按隶属函数值排序为金焰绣线菊>金山绣线菊。The photosynthetic Spiraea bunmalba ＇ Goldflame＇ adaptability of two color-leafed flowering shrubs i. e. Spiraea bunmalba ＇ Goldmound＇ and to weak light stress was studied, the changes of photosynthetic characteristics during weak light treatment and recovery processes were analyzed, and the changes of physiological adaptability under weak light environment were explored in order to provide reference for the scientific applications of Spiraea L. in the different light environments of city gardens. Two species Spiraea L. displayed obvious diurnal variation of photosynthesis, Pn diurnal variation presented double-peak curve when the light intensities were 60%-65% and 40%-45% of natural light, the first peak value was higher than the second one. There were obvious phenomena of ＂Midday Photosynthetic Depression＂. When the light intensity was 20%-25% of natural light, Pn diurnal variation was single-peak curve, there was no obvious ＂Midday Photosynthetic Depression＂. P, LCP, LSP, AQY and Rd of 2 species Spiraea L. decreased, the contents ofchlorophyll and carotenoid increased and Chla/Chlb decreased with the decrease of light intensity. The leaves of 2 species Spiraea L. became thinner, the epidermal cells of two sides became smaller, the thickness of palisade tissue and spongy tissue became thinner, the intercellular space of spongy tissue became bigger, the ratio of two tissues reduced with the decrease of light intensity. Two species Spiraea L. had produced specific proteins with low molecular weight （45.0--66 kDa） under the weak light stress, they might be the induced proteins. Two species Spiraea L. had certain recovery ability after 60%--65% and 40%--45% weak light treatments, their recovery ability was weak when light intensity was 20%- 25% of natural light. The thickness ratio of palisade tissue to spongy tissue, chlorophyll a/b and Pn were the important indicators in evaluating the resistance ability to weak light of 2 species Spiraea L. The value of chlorophyll a/b presented a significant

关 键 词：绣线菊 弱光胁迫与恢复 光合适应性 隶属函数 耐弱光能力 

分 类 号：S685.99[农业科学—观赏园艺]