Effects of understory habitats on photosynthesis and chlorophyll fluorescence characteristics of Polygonatum cyrtonema Hua

doi:10.14088/j.cnki.issn0439-8114.2024.12.019

Abstract

Abstract: The photosynthetic and chlorophyll fluorescence characteristics of Polygonatum cyrtonema Hua in forest gap（FG）, forest edge （FE） and forest canopy （FC） were studied to reveal its adaptation mechanism. The 3-year-old Polygonatum cyrtonema Hua with basically the same growth was selected. The photosynthetic parameters including the net photosynthetic rate （P_n）, transpiration rate （T_r） and stomatal conductance（G_s）, apparent quantum efficiency（AQY）, dark respiration rate（R_d）, maximum photosynthetic rate （P_n_max）, light compensation point （LCP） and light saturation point （LSP）, as well as chlorophyll fluorescence kinetic parameters including the initial fluorescence（F_o）, the maximum fluorescence（F_m）, the variable fluorescence（F_v）, the photochemical quenching coefficient（qP）, photochemical quantum efficiency（φPSⅡ）, non-photochemical quenching coefficient（NPQ）, electron transfer rate（ETR）, the maximal photochemical efficiency（F_v/F_m）, the potential activity of PSⅡ（F_v/F_o）, and the effective quantum efficiency of PSⅡ（F_v′/F_m′）, were measured by LI-6800. The results showed there were significant differences in P_n,T_r, G_s, F_o, F_m, F_v, F_v/F_m, F_v/F_o, F_v′/F_m′ of Polygonatum cyrtonema Hua in different habitats, their values of Polygonatum cyrtonema Hua in FG were the largest. The P_n_max, LCP and LSP of Polygonatum cyrtonema Hua in different habitats were different too, the order of values was FG>FE>FC. The LSP, LCP, P_n_maxof Polygonatum cyrtonema Hua in FG were 1 256, 17, 6.10 μmol/（m²·s）, respectively. The trend of qP and φPSⅡ was consistent, which decreased with the increase of PAR; NPQ increased with the increase of PAR. ETR increased first and then decreased with the increase of PAR. The growth of Polygonatum cyrtonema Hua in understory habitats light condition was not inhibited. However, there were significant differences in photosynthesis and chlorophyll fluorescence characteristics, which showed that Polygonatum cyrtonema Hua in FG was more conducive to the accumulation of organic matter.

Key words: Polygonatum cyrtonema Hua, photosynthetic characteristics, chlorophyll fluorescence characteristics, understory habitats

CLC Number:

S567.23⁺9

JIANG Xia, HE Jia-li, YUAN Cong-jun, LUO Yong-fei, DING Fang-jun. Effects of understory habitats on photosynthesis and chlorophyll fluorescence characteristics of Polygonatum cyrtonema Hua[J]. HUBEI AGRICULTURAL SCIENCES, 2024, 63(12): 105-109.

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