Photosynthetica, 2020 (vol. 58), 1

Photosynthetica 2020, 58(1):9-18 | DOI: 10.32615/ps.2019.133

Photosynthetic characteristics and chlorophyll a fluorescence induction parameters in elite clone (GS1) of Pinus sylvestris var. mongolica

P. MENG1,2, G.C. YOU2
1 Qingdao Agricultural University, 266000 Qingdao, Shandong Province, China
2 Liaoning Province Sand-Fixation and Afforestation Research Institute, 123000 Fuxin, Liaoning Province, China

We selected the elite clone of Pinus sylvestris var. mongolica 'GS1' from 365 clones in a primary seed orchard in Liaoning Province, China. To understand the photosynthesis characteristics and mechanisms, 40-year-old 'GS1' trees were compared with a common clone 'H524' of the same age at the same seed orchard. Results showed that 'GS1' had higher net photosynthetic rate because of higher stomatal conductance (gs); the larger external and inner diameters of stomata were the structural factors enabling maintenance of higher gs. The higher light-saturated net photosynthetic rate of 'GS1' was mainly due to higher electron transfer activity, demonstrated by the lower relative fluorescence intensity from O-step to P-step. The increase in density of active reaction centers resulted in an increase in energy flux per cross section, which led to higher photosynthetic performance.

Keywords: JIP-test; light-response parameter; relative variable fluorescence; stomata size.

Received: May 21, 2019; Accepted: September 24, 2019; Prepublished online: November 12, 2019; Published: March 10, 2020Show citation

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MENG, P., & YOU, G.C. (2020). Photosynthetic characteristics and chlorophyll a fluorescence induction parameters in elite clone (GS1) of Pinus sylvestris var. mongolica. Photosynthetica, 58(1), 9-18. doi: 10.32615/ps.2019.133.
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