DIURNAL CHANGES IN CHLOROPHYLL A FLUORESCENCE AND CAROTENOID COMPOSITION IN OPUNTIA-FICUS-INDICA, A CAM PLANT, AND IN 3 C3 SPECIES IN PORTUGAL DURING SUMMER

被引:19
作者
WINTER, K [1 ]
LESCH, M [1 ]
机构
[1] LEHRSTUHL BOT 2,W-8700 WURZBURG,GERMANY
关键词
C3; CAM; DIURNAL CHANGES; FLUORESCENCE; PHOTOSYNTHETIC ELECTRON TRANSPORT; ZEAXANTHIN;
D O I
10.1007/BF00650323
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Diurnal changes in chlorophyll a fluorescence were determined in four species, differing in life form, in Portugal during the summer of 1989. These included Opuntia ficus-indica, a CAM plant, and Helianthus annuus, Ficus carica and Arbutus unedo, three C3 species. Steady state fluorescence yield, F(S), and maximum fluorescence yield, F(M)', were determined at different times of the day. Using the model of Genty et al. (1989), the photon use efficiency of photosystem II electron transport, phi(e), was calculated from (F(M)'- F(S))/F(M)'. Diurnal changes in relative rate of non-cyclic electron transport through photosystem II, J(e), were derived by multiplying phi(e) by the incident photon flux density (PFD). When J(e), determined for each species for various points in time throughout the day, was plotted against corresponding values of PFD, the light response curves obtained showed that J(e) was linearly dependent on PFD in low light and approached saturation in high light. The highest values of J(e) were observed in Helianthus annuus, followed by Opuntia ficus-indica, Ficus carica and Arbutus unedo. The proportion of the xanthophyll zeaxanthin to total carotenoids, determined around noon, was inversely related to maximum rates of J(e).
引用
收藏
页码:505 / 510
页数:6
相关论文
共 20 条