关键词: 叶状体苔藓, 光合色素, 光合效率, 叶绿素a/b, 气室

Abstract: 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.

Key words: thalloid bryophytes, photosynthetic pigments, photosynthetic efficiency, chlorophyll a/b, air chamber