PHOTOSYNTHETIC RESPONSES IN REED (PHRAGMITES AUSTRALIS (CAV.) TRIN. EX STEUD.) SEEDLINGS INDUCED BY DIFFERENT SALINITY- ALKALINITY AND NITROGEN LEVELS

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DENG CH.; ZHANG G.; PAN X.

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Paper Information

Journal: JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST) Year:2011 | Volume:13 | Issue:5 Page(s): 687-699

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Title

PHOTOSYNTHETIC RESPONSES IN REED (PHRAGMITES AUSTRALIS (CAV.) TRIN. EX STEUD.) SEEDLINGS INDUCED BY DIFFERENT SALINITY- ALKALINITY AND NITROGEN LEVELS

Author(s)

DENG CH. | ZHANG G. | PAN X. | Issue Writer Certificate

Keywords

ALKALINIZED-SALINIZED WETLANDSQ3

CHLOROPHYLL FLUORESCENCEQ3

GAS EXCHANGEQ3

NITROGENQ3

PHRAGMITES AUSTRALISQ3

Abstract

Many Phragmites-dominated wetlands have been markedly salinized and alkalinized in the Songnen Plain, northeastern China. Agricultural wastewater with high NITROGEN content has been discharged into these ALKALINIZED-SALINIZED WETLANDS. To understand the effect of salinity-alkalinity on reed (Phragmites australis) seedlings at various NITROGEN levels, we examined photosynthesis rate, CHLOROPHYLL FLUORESCENCE characteristics, and chlorophyll content of reed seedlings using GAS EXCHANGE and chlorophyll a fluorescence tests. The greatest decreases (by 82%, 15%, 82% and 98%) of net photosynthesis rate (Pn), maximal efficiency of photosystem II (PSII) photochemistry (FV/FM), comprehensive photosynthesis performance index (PIABS) and plant height growth rate were observed at high salinity-alkalinity (mixed with 150 mM NaCl and 100 mM NaHCO3). Stomatal limitation was the main reason for decreased photosynthesis rate at low salinity-alkalinity (mixed with 50 mM NaCl and 25 mM NaHCO3). The activity of PSII was significantly inhibited at high salinity-alkalinity. Both donor and acceptor sides of PSII are the target sites of high salinity-alkalinity. High N (30 mM) at low salinity-alkalinity and moderate N (15 mM) at high salinity-alkalinity mitigated the toxicity of salinity-alkalinity on reeds and promoted plant height growth, chlorophyll synthesis, and PSII activity. Proper levels of N partly reduced the toxicity of salinity-alkalinity on the donor and acceptor sides of PSII. This suggests that agricultural wastewater containing high level of NITROGEN may be helpful in restoration of Phragmites-dominated salinized wetland, though the N level needed for salinity-alkalinity stressed reed varies with the salinity-alkalinity level.

Cites

MAIZE RESPONSE TO WATER, SALINITY AND NITROGEN LEVELS: PHYSIOLOGICAL GROWTH PARAMETERS AND GAS EXCHANGE

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APA: Copy

DENG, CH., ZHANG, G., & PAN, X.. (2011). PHOTOSYNTHETIC RESPONSES IN REED (PHRAGMITES AUSTRALIS (CAV.) TRIN. EX STEUD.) SEEDLINGS INDUCED BY DIFFERENT SALINITY- ALKALINITY AND NITROGEN LEVELS. JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST), 13(5), 687-699. SID. https://sid.ir/paper/63083/en

Vancouver: Copy

DENG CH., ZHANG G., PAN X.. PHOTOSYNTHETIC RESPONSES IN REED (PHRAGMITES AUSTRALIS (CAV.) TRIN. EX STEUD.) SEEDLINGS INDUCED BY DIFFERENT SALINITY- ALKALINITY AND NITROGEN LEVELS. JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST)[Internet]. 2011;13(5):687-699. Available from: https://sid.ir/paper/63083/en

IEEE: Copy

CH. DENG, G. ZHANG, and X. PAN, “PHOTOSYNTHETIC RESPONSES IN REED (PHRAGMITES AUSTRALIS (CAV.) TRIN. EX STEUD.) SEEDLINGS INDUCED BY DIFFERENT SALINITY- ALKALINITY AND NITROGEN LEVELS,” JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST), vol. 13, no. 5, pp. 687–699, 2011, [Online]. Available: https://sid.ir/paper/63083/en

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