Seasonal variation in photosystem II efficiency and photochemical reflectance index of evergreen trees and perennial grasses growing at low and high elevations in subtropical Taiwan.
Three pines species, three evergreen broadleaf trees, one C(3) and two C(4) perennial grasses of subtropical Taiwan were studied to elucidate the correlation between photosystem II (PSII) efficiency and photochemical reflectance index (PRI = (R(531) - R(570))/(R(531) + R(570))). Measurements were made at two sites differing in altitude (800 and 2600 m) over several growing seasons. At high elevation, potential PSII efficiency, measured by chlorophyll fluorescence (the ratio of variable to maximal fluorescence; F(v)/F(m)) at predawn, decreased with decreasing air temperature and varied greatly among species. At the lowest air temperature (-3 degrees C) studied, variation in F(v)/F(m) among species ranged from 0.33 to 0.72. In contrast, at low elevation where air temperature was moderate, seasonal variation in F(v)/F(m) was small in all of the study species. When species, elevation and season data were pooled, despite the high variation in F(v)/F(m) among species, a good correlation between F(v)/F(m) and PRI was observed. When compared at the same value of PRI, F(v)/F(m) of evergreen trees was higher than that of perennial grasses; however, when the minimum temperature on the measurement day was below 0 degrees C, F(v)/F(m) was underestimated relative to PRI. We conclude that PRI could be used as a remote indicator of photosynthetic function when air temperature is above 0 degrees C.
Weng
Jen-Hsien
JH
Department of Life Sciences, National Chung-Hsing University, Taichung, Taiwan. jhweng@dragon.nchu.edu.tw
Liao
Tien-Szu
TS
Hwang
Mon-Yuan
MY
Chung
Chi-Ch
CC
Lin
Chung-Ping
CP
Chu
Chung-Hei
CH
D000531:Altitude; D002980:Climate; D010777:Photochemistry; D045332:Photosystem II Protein Complex / Q000378:metabolism* / Q000528:radiation effects; D006109:Poaceae / Q000254:growth & development / Q000378:metabolism* / Q000528:radiation effects; D012621:Seasons; D013624:Taiwan; D013997:Time Factors; D014197:Trees / Q000254:growth & development / Q000378:metabolism* / Q000528:radiation effects*; D014329:Tropical Climate
D045332:Photosystem II Protein Complex