摘要
重楼属(Paris)植物作为名贵的药用植物,野生资源逐渐匮乏。在人工栽培的过程中,为了控制其生长条件,探索生长环境因子对其影响,通过Li-COR6400对4种重楼属植物光响应及CO2响应曲线进行测定,比较其光合生理参数对光和CO2响应的差异。结果表明:花叶重楼(Paris marmorata)最大净光合速率(Pmax)、光饱和点(LSP)、最大电子传递速率(Jmax)最高,光补偿点(LCP)相对较低,CO2补偿点(Г*)最低、最大Rubisco羧化速率(Vcmax)、CO2饱和点(Cisat)相对较高,说明其对光强的适应范围较宽;光响应下水分利用效率(WUE)相对较低。滇重楼(P.yunnanensis)的LCP、Г*、Cisat最高,Pmax、LSP、Jmax较高,比较适宜强光及高浓度CO2环境;在CO2浓度升高的情况下其WUE最高。白花重楼(P.polyphylla)的表观量子效率(AQY)偏低,对强光利用能力不强。毛重楼各参数居中,适应能力一般。滇重楼及花叶重楼对强光的利用能力较强,在栽培管理过程中,应对苗床适当增湿处理,增大光合同化效率,以提高产量;白花重楼植株、叶片较小,对强光的利用能力也相对较弱,在管理中应注意适当遮阴。
Species of Paris （Trilliaceae） have often been used as medicinal-plants. Because of excessive exploita- tion, in this regard the wild resource of Paris is almost exhausted. Some species of Paris were transplanted for use in photosynthesis research and for conservation purposes. In the present study, light and CO2 photosynthetic re- sponse curves were investigated in four Paris taxa ： P. polyphylla var. yunnanensis and var. alba, P. mairei, and P. marmorata. Our results showed that P. rnarmorata had the highest maximum photosynthetic rate （ Pm^x ; 8.6 Ixmol＂ m-2＂ s-1 ）, light saturation point （LSP; 827 ttmol, m-2. s-1 ）, maximum electron transport rate （Jm,= ; 39.9 mol＂ m-2＂ s-＇ ）, a relatively high maximum earboxylation rate （ Vcm~ ; 28.9 I^mol~ m-2＂ s-1 ） and carbon dioxide saturation point （ Ci,at ; 726 I^mol＂ mo1-1 ）, but a lower light compensation point （ LCP; 6.23 ~mol. m-2. s-1 ） and the lowest carbon dioxide compensation point （ F＊ ; 20.7 Ixmol＂ mo1-1 ）. This suggests that P. marmorata is well adapted to light and CO2; however it has a low ability to acclimate to environmental stress as indicated by low water use effi- ciency （WUE） in high light conditions. P. polyphylla var. yunnaaensis had the highest light compensation point （ LCP; 10.1 μmol· m-2·s-1 ）, carbon dioxide compensation point （F＊ ; 35.3 μmol· mol-1 ） , carbon dioxide saturation point （ C~,, ; 727 Ixmol. mol-~ ）, relatively high maximum photosynthetic rate （ Pro~ ; 7.5 ptmol- m-z. s-＇ ） and light saturation point （ LSP; 728 ~mol. m-2. s-~ ）, maximum light-saturated electron transfer rate （Jmax ; 37.7 ~mol ~ m-2＇ s-1 ）, suggesting that it is suitable for conditions of higher light and CO2 concentration. This taxon can adapt to adverse conditions, as suggested by high WUE under increased CO2 concentration. In contrast, P. polyphylla var. alba exhibited a relatively lower apparent quantum yield （ AQY; 0. 037 Jxmol. mol-~ ） and poorer growth performance than the other taxa. We suggest from our results that different light and water conditions are suitable for the growth of the different taxa. Photosynthesis assimilation efficiency and production can be increased by raising humidity for P. polyphylla var. yunnanensis and P. marmorata. To protect plants of P. polyphylla var. alba from strong sunshine, they should be shaded from March to mid June.
出处
《植物分类与资源学报》
CAS
CSCD
北大核心
2013年第5期594-600,共7页
Plant Diversity
基金
中国科学院战略性先导科技专项子课题(XDA05050206)
关键词
重楼属
光合特性
水分利用效率
Paris
Photosynthetic characteristics
Water use efficiency
