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| The growth and chlorophyll fluorescence characteristics of Pinuscaribaea and P. elliottii at the seedling stage |
| Hu Jiwen,Dai Ying,Li Zhen,Zhao Fencheng,Huang Shaowei,Guo Wenbing |
| (Guangdong Provincial Key Laboratory of Silviculture,
Protection and Utilization / Guangdong Academy of Forestry,
Guangzhou,;South China Agricultural University, Guangzhou,) |
| Abstract: |
| The nutrition pot experiments of Pinus carib-
aea and P. elliottii (PEE) were conducted to assess the
response of chlorophyll (Chl) fluorescence parameters to
different provenances and measured time. The materials
were potted seedlings from 16 P. caribaea provenances
and 4 PEE provenances. The growth of the seedlings
and the Chl fluorescence parameters were measured in
July and August 2016 and February 2017, separately.
The result showed there were significant differences
among seedlings of different provenances in height and
diameter (P<0.01). The measured time and species had
a significant effect on the PSⅡ maximal photochemical
efficiency (Fv/Fm), while the interaction effect was not
significant. The Fv/Fm was higher in February 2017
than in July 2016 and August 2016; the response models
of measured times of two species were opposite in the
effective quantum yield (ΦPS Ⅱ), the photochemical
quenching coefficient (qP) and the apparent electron
transport rates (ETR). The Chl fluorescence parameters
of two species were affected by the measured times
rather than provenances. The growth had a negative
correlation with Fv/Fm and Fv′/Fm′ in February 2017 in
examined seedlings according to the correlation analy-
sis. The Chl fluorescence parameters of P. caribaea and
PEE were inhibited by high light intensity, which might
not affect the growth. The Chl fluorescence parameters
in P. caribaea were also inhibited by low temperature,
which might be related to growth. The Chl fluorescence
parameters of P. caribaea in February 2017 might be
indicators of chilling tolerance among P. caribaea indi-
viduals. |
| Key words: Pinus caribaea · Pinus elliottii · Growth
· Traits chlorophyll fluorescence parameters |
