Analysis of Free Amino Acids of Alpine Periglacial Plants
Leaves of 22 main alpine periglacial plants in flowering stage that collected from the source areas of the (U)r(u)qi River were studied. Contents of free amino acids were analyzed. High free neutral amino acid levels were observed in the 22 plant species. It is found that the highest contribution to total amino acid accumulation came from Pro, Thr, Asp. Ala and Glu. Higher levels of free amino acid and greater difference were observed among plants grown in the same vegetation. For talus plants, free Pro content of Chorispora Bun-geana was the highest, up to 67% of the total free a-mino acids. The percentage of Pro was 13 times higher than that of Sanssurea involucrate , Cancrinia chrys-ocephala and Lagopsis flava. A greater difference existed between C Bungeana and three other plants. For the three vegetation zones , the sequence of the average contents of the total free amino acids. Pro and neutral amino acids was alpine talus vegetation, alpine cushion vegetation and alpine meadow vegetation. The average content of Pro of alpine meadow vegetation was higher than that of alpine cushion vegetation. In light of the levels of different constituents of free amino acids, it is revealed that the periglacial plants have developed a mechanism adapted to the rigid environments.
alpine periglacial plantsfree amino acidsfree prolineadaptation to the environments
NETL
NSTL
万方数据
维普
