Effects of nitrate application on alleviating photosynthesis restriction of Cinnamomum burmannii leaves under elevated CO2 concentration and enhanced temperature

Abstract

Abstract: In this study,potted C.burmannii saplings were cultured in a top-closed chamber with elevated CO₂(+CO₂,731 μmol·mol^-1) and ambient CO₂(CO₂,365 μmol·mol^-1),and at diurnal temperature(day/night) 25/23 and 32/25,respectively.The gas exchange,calculated photosynthesis parameter,Rubisco content,and activated state of Rubisco were examined.The results showed that under +CO₂ and at 25/23,the mean photosynthetic rate(Pnsat) of sapling leaves was 5.1%higher than that under +CO₂ and at 32/25.Temperature enhancement declined Pnsat,while nitrate addition increased it.Under +CO₂,saplings had lower V_cmax and J_max at 32/25 than at 25/23.Temperatureenhancement under +CO₂ also declined V_cmax and J_max.Under +CO₂,lower photorespiration rate(R_p) occurred in leaves,but temperature enhancement could increase R_p.Under +CO₂,Rubisco content(N_R) and its active site per unit leaf area(M) decreased as diurnal temperature changed from 25/23 to 32/25.Meanwhile,nitrate addition could increase N_R and M.It may be suggested that nitrate addition could alleviate the restriction of photosynthesis under elevated CO₂ concentration and enhanced temperature.

Key words: Cinnamomum burmannii, Restriction of photosynthesis, Elevated temperature, Elevated CO₂ concentration

CLC Number:

Q945.11

SUN Guchou, ZHAO Ping, RAO Xingquan, CAI Xi'an, ZENG Xiaoping . Effects of nitrate application on alleviating photosynthesis restriction of Cinnamomum burmannii leaves under elevated CO₂ concentration and enhanced temperature[J]. Chinese Journal of Applied Ecology, 2005, 16(8): 1399-1404.

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Effects of nitrate application on alleviating photosynthesis restriction of Cinnamomum burmannii leaves under elevated CO₂ concentration and enhanced temperature

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