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HuJiwen,DaiYing,LiZhen,ZhaoFencheng,HuangShaowei,GuoWenbing
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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

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