六种叶状体苔藓植物叶绿素含量和光合效率研究

Chlorophyll Content and Photosynthetic Efficiency of Six Thalloid Bryophytes

以六种叶状体苔藓为材料,通过测定叶绿素含量及实际光合量子产量,检验叶状体苔藓植物叶绿素含量与实际光合量子产量之间的关系。结果表明,六种叶状体苔藓总叶绿素含量中值6.06 mg·g^(-1),其中花叶溪苔Pellia endiviifolia最高(9.72 mg·g^(-1)),楔瓣地钱Marchantia emarginata最低(4.46 mg·g^(-1));叶绿素a/b值变化范围1.61～2.04,林氏黄角苔Phaeoceroscarolinianus最高,毛地钱Dumortierahirsuta最低;紫背苔Plagiochasma rupestre、楔瓣地钱和蛇苔Conocephalum conicum实际光合量子产量明显高于毛地钱、花叶溪苔和林氏黄角苔。叶状体苔藓叶绿素含量与其实际光合量子产量之间并非简单的线性关系,气室结构及生境可能影响其实际光合效率。这一结论进一步丰富了苔藓植物对光照的生态适应理论。

Using six thalloid bryophytes as materials,the corresponding relationship between chlorophyll content and actual photosynthetic quantum yield was determined.Results showed that the median value of total chlorophyll content of six species was 6.06 mg·g-1,with the highest value of 9.72 mg·g-1 in Pellia endiviifolia and the lowest of 4.46 mg·g-1 in Marchantia emarginata;the ratio of chlorophyll a/b ranged from 1.61 to 2.04,with the highest value in Phaeoceros carolinianus and the lowest in Dumortiera hirsuta;the actual photosynthetic quantum yields of three species,i.e.Plagiochasma rupestre,Marchantia emarginata and Conocephalum conicum,were significantly higher than those of Dumortiera hirsuta,Pellia endiviifolia and Phaeoceros carolinianus.This study indicated that there was no simple linear relationship between chlorophyll content and actual photosynthetic quantum yield in thalloid bryophytes.Habitats and air chamber of gametophytes may affect their actual photosynthetic quantum yield,which further enriches the ecological adaptation theory of bryophytes to light.