Seasonal Variation in Photosynthetic Characteristics and Chlorophyll Content of the Loranthus tanakae, Viscum album var. coloratumand its Hosts in Korea

摘要

We investigated seasonal variation in photosynthetic characteristics and chlorophyll content of the Loranthus tanakae, Viscum album van coloratum and its hosts in Korea. The maximum photosynthesis and transpiration rate of L. tanakae were 9.36 mumol.m~(-2)-s~(-1)at 941 umolm~2s PAR (photosynthetically active radiation) in June, 5.06 mumol.m~(-2)-s~(-1) at 1,596 mumol.m~(-2)-s~(-1)PAR in July, respectively. The maximum photosynthesis and transpiration rate of V. album var. coloratum were 6.51 mumol.m~(-2)-s~(-1) at 418 mumol.m~(-2)-s~(-1) PAR in Autumn, 3.91 mumol.m~(-2)-s~(-1) at 1,735mumol.m~(-2)-s~(-1) PAR in Autumn, respectively. V. album var. coloratum was able to conduct photosynthesis in November whereas its host and L. tanakae were not able to conduct photosynthesis. Especially transpiration rate of L. tanakae were always higher than its host and V. album var. coloratum. The chlorophyll a+b contents of L. tanakae was 8.23 mg-g~(-1) in July, V. album var. coloratum was 10.27 mg-g 1 in June, and chlorophyll a/b ratio of L. tanakae was 1.7-3.7, V. album var. coloratum was 1.1-4.5, depend on season.