In order to study the effect of different light intensities on the photosynthesis mechanism of Camellia amplexicaulis, we detected the diurnal changes of chlorophyll fluorescence parameters of shade in 3 months respectively. The results showed that under different light intensity treatments, the net photosynthetic rate presented a single-peak curve with the peak at around 11:00am. The decrease of photosynthetic rate was mainly caused by stomatal limitation factor. The chlorophyll fluorescence parameters indicated that electron transfer was blocked, the heat dissipation increased, the PSII reaction center was destroyed under strong light conditions, which reduce the photosynthetic efficiency of C. amplexicaulis; under excessive shade condition, photoinhibition of C. amplexicaulis resulted in damage of photosynthetic apparatus; the photosynthetic efficiency was higher under 45% illumination. Correlation analysis showed that Pn was significantly correlated with Ta, RH, Gs, Tr, WUE and ETR, and was significantly negatively correlated with RH and negatively correlated with Ci. The main environmental factors affecting the net photosynthetic rate of C. amplexicaulis were the temperature and relative humidity of air.
HUANG Li-ying
,
PAN Li-jun
,
HUANG Yong-fang
,
XUE Ke-na
,
SU Mu-rong
,
LIN Wei
,
YE Xiao-ping
,
XIAN Gan-biao
. Diurnal Changes of Photosynthesis and Fluorescence Parameters in Camellia amplexicaulis under Different Light Intensities[J]. Subtropical Plant Science, 2019
, 48(03)
: 237
-242
.
DOI: 10.3969/j.issn.1009-7791.2019.03.006
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