The growth and photosynthesis characters of Taxodium hybrid ‘Zhongshanshan 407' 
following the de-submergence

doi:10.3969/j.issn.1000-2006.201606025

The growth and photosynthesis characters of Taxodium hybrid ‘Zhongshanshan 407' following the de-submergence

HUA Jianfeng, HAN Luwan, WANG Zhiquan, SHI Qin, YIN Yunlong

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2017, Vol. 41 ›› Issue (05) : 191-196.

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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2017, Vol. 41 ›› Issue (05) : 191-196. DOI: 10.3969/j.issn.1000-2006.201606025

The growth and photosynthesis characters of Taxodium hybrid ‘Zhongshanshan 407' following the de-submergence

HUA Jianfeng¹, HAN Luwan¹, WANG Zhiquan^1,2, SHI Qin¹, YIN Yunlong^1*

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Abstract

【Objective】Determining the growth and photosynthesis of the Taxodium hybrid ‘Zhongshanshan 407'(T. mucronatum Tenore ♀ × T. distichum(Linn.)Rich ♂, referred to as T. ‘407')recovering from three-month submergence stress could provide the basis for vegetation acclimation screening in the wetland ecosystem. 【Methods】Two-year-old T. ‘407' were subjected to three months' submersion treatment(S)in this study; controls(CK)were not submerged. Photosynthesis and chlorophyll fluorescence parameters of T. ‘407' were measured using a LI-6400XT gas exchange system and OS1p portable modulation fluorometer. Then, plant growth indexes were measured after 10 months during recovery. 【Results】The net photosynthetic rate(P_n), stomatal conductance(G_s)and transpiration rate(T_r)of T. ‘407' in the S treatment were significantly higher than those in CK after submersion, whereas water use efficiency(E_WUE)showed the opposite trend. In addition, chlorophyll fluorescence of T. ‘407' in the S treatment maintained a certain level during the recovery process. The parameters of variable fluorescence(F_v), potential activity of PSII(F_v/F₀), light conversion efficiency(F_v/F_m), actual photochemical efficiency(Φ_PSⅡ), and electron transport rate(V_ETR)of T. ‘407' exhibited no significant differences between S and CK treatments. Moreover, no significant differences were found in total and shoot biomass between S and CK treatments after 10 months of recovery.【Conclusion】T. ‘407' adjusted its growth and photosynthesis strategies to adapt to de-submergence; it is thus very promising species for ecological restoration in wetland ecosystems such as the Three Gorges Reservoir area. Furthermore, this study provided a scientific basis for ecosystem restoration and plant screening in wetlands.

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HUA Jianfeng, HAN Luwan, WANG Zhiquan, SHI Qin, YIN Yunlong. The growth and photosynthesis characters of Taxodium hybrid ‘Zhongshanshan 407' following the de-submergence[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2017, 41(05): 191-196 https://doi.org/10.3969/j.issn.1000-2006.201606025

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