作者机构:
[Huang, X. H.; Liu, M. S.; Xu, H. Y.] Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha 410004, Peoples R China.;[Zhu, F.] Hunan Agr Univ, Coll Landscape Architecture & Art Design, Changsha 410128, Peoples R China.;[Wang, R. J.] Guangxi Zhuang Autonomous 11 Reg Forestry Res Ins, Guangxi Key Lab Super Trees Resource Cultivat, Nanning, Peoples R China.
关键词:
energy conversion efficiency;heavy metal stress;JIP-test;OJIP curve
摘要:
Manganese (Mn) excess is a major abiotic stress for plant growth. In the present study, we investigated the effects of Mn on photosynthesis in Ligustrum lucidum and Melia azedarach leaves using chlorophyll fluorescence transients. Both plant species were exposed to two Mn concentrations (0.5 and 1 mmol) for 10 and 30 d. Results showed that excess Mn significantly inhibited photosynthesis. With the increase of Mn concentration and stress time, the inhibition was more serious. Mn stress impaired PSII at the donor and the acceptor side by damaging the oxygen-evolving complex and limiting electron transport downstream of QA in both trees. A significant decline in 820 nm reflection curve absorption was observed in M. azedarach, suggesting that the oxidization-reduction reactions in PSI were inhibited but this phenomenon was not observed in L. lucidum. Therefore, excess Mn impaired the whole electron transport chain associated with inactive PSII reaction centers in Ligustrum lucidum and inhibited oxidization-reduction reactions in PSI in M. azedarach.
期刊:
Journal of Hazardous Materials,2020年381:121203 ISSN:0304-3894
通讯作者:
Jiang, Lijuan
作者机构:
[Jiang, Lijuan; Yu, Peiyi; Zhu, Fan; Sun, Yujing] Cent South Univ Forestry & Technol, Coll Life Sci & Technol, 498 South Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.;[Sun, Youping] Utah State Univ, Dept Plants Soils & Climate, 4820 Old Main Hill, Logan, UT 84332 USA.;[Huang, Zhongliang] Hunan Acad Forestry, 658 South Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.;[Zhu, Fan] Cent South Univ Forestry & Technol, Natl Engn Lab Appl Technol Forestry & Ecol South, 498 South Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.
通讯机构:
[Jiang, Lijuan] C;Cent South Univ Forestry & Technol, Coll Life Sci & Technol, 498 South Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.
关键词:
Bacterial networks;Biomarkers;Community structure;Heavy metal contamination;Suillus luteus
摘要:
Pinus massoniana is one of the potential tree species of afforestation in barren mine tailing area, and ectomycorrhizal fungi contributes remarkably to its survival. However, how ectomycorrhizal fungi interacts with Pinus massoniana under heavy metals' stress is unknown. Two systems (Pinus massoniana inoculated with and without ectomycorrhizal fungi) were designed, and each system contained rhizosphere and non-rhizosphere, while bulk soil was sampled as control. The results showed that treatment of ectomycorrhizal fungi inoculation could obviously improved the absorption of soil moisture, total carbon/total nitrogen and nutrients, while reduced the bulk density and heavy metals of soil when compared with control (p0.05). The heavy metals accumulating in plants' roots with ectomycorrhizal fungi were greater than that without ectomycorrhizal fungi. Conversely, they were lower in shoots with ectomycorrhizal fungi. The bacterial community were affiliated with 23 bacterial phyla, 70 classes, 115 orders, 201 families, and 363 genera. Constrained Principal Coordinate Analysis and redundancy analysis demonstrated that bacterial communities structure in the soil inoculated with or without ectomycorrhizal fungi and bulk soil were distinguishable, but no difference between rhizosphere and non-rhizosphere. The LEfSe analysis showed Acidobacteria, Actinobacteria, and Proteobacteria were the dominant phyla that contributed to the difference among treatments.
作者机构:
[Liu, Xiongsheng; Jiang, Yi; Wang, Yong] Guangxi Zhuang Autonomous Reg Forestry Res Inst, Guangxi Key Lab Super Trees Resource Cultivat, Nanning, Peoples R China.;[Huang, Xinhao; Zhu, Fan] Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha, Hunan, Peoples R China.
通讯机构:
[Zhu, Fan] C;Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha, Hunan, Peoples R China.
关键词:
N addition;soil exchangeable cation;soil-buffering capacity;foliar nutrient;Keteleeria fortunei var. cyclolepis;ajout d’azote;cations échangeables du sol;capacité tampon du sol;nutriments foliaires;Keteleeria fortunei var. cyclolepis
通讯机构:
[Zbu, Fan] C;[Zbu, Fan] E;Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;Engn Lab Appl Technol Forestry & Ecol Southern Ch, Changsha 410004, Hunan, Peoples R China.
摘要:
The toxic effect of excessive manganese (Mn) on photosystem II (PSII) of woody species remains largely unexplored. In this study, five Mn concentrations (0, 12, 24, 36, and 48 mM) were used, and the toxicity of Mn on PSII behavior in leaves of Ligustrum lucidum was investigated using in vivo chlorophyll fluorescence transients. Results showed that excessive Mn levels induced positive L- and K-bands. Variable fluorescence at 2 ms (V-J) and 30 ms (V-I), absorption flux (ABS/RC), trapped energy flux (TRo/RC), and dissipated energy flux (DIo/RC) increased in Mn-treated leaves, whereas the performance index (PIABS), electron transport flux (ETo/RC), maximum quantum yield (phi(Po)), quantum yield of electron transport (phi(Eo)), and probability that an electron moves further than Q(A)(-) (psi(o)) decreased. Also, excessive Mn significantly decreased the net photosynthesis rate and increased intercellular CO2 concentration. The results indicated that Mn blocked the electron transfer from the donor side to the acceptor side in PSII, which might be associated with the accumulation of Q(A)(-), hence limiting the net photosynthetic rate.