Analysis of needle photosynthetic index characteristics for long period seed setting and non-setting trees of Pinus koraiensis

LIN Qiang, LU Tianyu, SHEN Hailong, WANG Yuanxing, ZHANG Peng

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (3) : 137-146.

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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (3) : 137-146. DOI: 10.12302/j.issn.1000-2006.202203032

Analysis of needle photosynthetic index characteristics for long period seed setting and non-setting trees of Pinus koraiensis

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Abstract

【Objective】Photosynthetic products form the basis for forest growth and fruit development. This study analyzed the differences in photosynthetic physiological indexes of Korean pine (Pinus koraiensis) individuals that were largely similar in terms of their vegetative growth patterns, but significantly different with regards to seed setting. This study was conducted to provide a scientific basis for the optimum cultivation of the fruit and wood of P. koraiensis. 【Method】Thirty-year-old Pinus koraiensis in the seed orchard of the Lushuihe Forestry Bureau was selected as the research site, and the dynamic changes in chlorophyll, specific leaf area (SLA), light response parameters, and non-structural carbohydrates (NSC) during the growing season were assessed. 【Result】(1) There were significant differences in chlorophyll a (Chl a), chlorophyll b (Chl b), chlorophyll carotenoids, and total chlorophyll (Chl T) under different seed setting conditions. Specifically, Chl a, Chl b, Car and Chl T of non-fruiting P. koraiensis were significantly higher than those of fruiting Pinus koraiensis during the growing season, but chlorophyll a/b (Chl a/b) showed the opposite trend. However, the indices of the two seed-setting properties of P. koraiensis showed significant differences across different months. Chl a, Chl b, Car and Chl T decreased, SLA increased, and Chl a/b decreased at first and then increased. (2) The light saturation point (LSP) was significantly different between the two seed-setting properties of P. koraiensis; apparent quantum efficiency (AQY), light compensation point (LCP), maximum net photosynthetic rate (Pn,max) and dark respiration rate (Rd) were not significantly different. Except for the LCP, AQY and Rd of the two seed-setting properties of P. koraiensis showed an increased during the entire growing season. On the other hand, Pn,max, LCP, and LSP decreased. Two types of seed-setting characteristics of P. koraiensis needles were noted. Specifically, AQY showed less seed-setting than non-seed-setting in all months except May, but Rd, Pn,max and LSP showed the opposite trend. In addition, LCP in May and July is less seed-setting than non-seed-setting, and in June and August is more seed-setting than non-seed-setting. At the same time, LCP and LSP increased gradually with an increase in canopy, and the difference in each index month was significant. (3) There was no significant difference between soluble sugar, starch and NSC in the needles of the two seed-setting P. koraiensis individuals. However, the concentrations of soluble sugars and NSC in conifers were higher than those in non-conifers, except in April and August. In addition, the starch concentration was stable except for in June. 【Conclusion】P. koraiensis has higher photosynthetic potential and material consumption capacity, so it assimilates more carbon under light conditions and improves energy conversion efficiency; this results in it storing more starch and NSC during the growing season, providing nutritional support for fruit development.

Key words

Pinus koraiensis (Korean pine) / photosynthetic parameters / non-structural carbohydrates / seasonal dynamics

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LIN Qiang , LU Tianyu , SHEN Hailong , et al . Analysis of needle photosynthetic index characteristics for long period seed setting and non-setting trees of Pinus koraiensis[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2023, 47(3): 137-146 https://doi.org/10.12302/j.issn.1000-2006.202203032

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