模拟光条件下有性繁殖香根草光合生理的研究  

Photosynthesis physiology of sexual reproductive Vetiveria zizanioides under simulated light source

作　　者：刘金祥[1] 李文送[1] 刘家琼[1] 

机构地区：[1]湛江师范学院热带草业科学研究所,湛江524048

出　　处：《生态学杂志》2005年第4期390-394,共5页Chinese Journal of Ecology

基　　金：广东省"千百十"优秀人才基金 (Q0 2 113 );湛江市科技攻关项目(2 0 0 2 10 1);湛江师范学院自然科学基金资助项目

摘　　要：利用人工模拟光源研究了两种不同处理的(半水淹和对照)有性繁殖香根草的光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、水分利用效率(WUE)和叶面饱和蒸气压亏缺(Vpdl)随模拟光辐射(SPR)的变化规律。结果表明,半水淹处理的Pn、Gs、Tr和WUE均比长势良好的对照处理高,这可能与淹水胁迫和香根草所处的物候期不同有关。有性繁殖香根草的光补偿点较低,而光饱和点较高,26 0 0 μmol·m-2 ·s-1SPR强度Pn还未达最大值。结合生长指标参数综合比较,两种处理的分值却相同。因此可以认为,有性繁殖香根草保持了亲本水陆两栖的特性,并具有强大的耐涝能力,适于河岸、水库。Photosynthetic rate (Pn),stomatal conductance (Gs),transpiration rate (Tr),water use efficiency(WUE) and vapor pressure deficit at the leaf surface (Vpdl) of sexual reproductive Vetiver zizanioides were investigated under artificial simulated light source and different treatments (half-drown and normal treatment).The results showed that the plant under the normal treatment grew better than that under the half-drown,which had much higher Pn,Gs,Tr and WUE than the former.It might be caused by the different growth period and drown stress.The sexual reproductive V.zizanioides had a lower light compensation point,but a higher light saturation point,its Pn still did not reach the maximum when simulated photosyntyhetic radiation(SPR)had been 2 600 μmol·m -2 ·s -1 .Compared comprehensively with combined growth parameters,the marks of two treatments were the same,which meant that sexual reproductive V.zizanioides maintained the amphibious characteristic of the parents which made it a euryhydric species and suitable to be planted at wetlands along river bank,reservoir and embankment.

关 键 词：模拟光辐射 有性繁殖香根草 光合生理 半水淹 

分 类 号：Q945.11[生物学—植物学]