Effect of Nitrogen Forms on Photosynthetic Characteristics and Nitrogen Metabolism of Clematis
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the Provincial Public Welfare Research Program of Zhejiang province (Grant No.LNG18C 150006); Science and Technology Program of Zhejiang province(Grant No.2019C02036).

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    Abstract:

    In order to understand the photosynthetic characteristics and response mechanism of nitrogen metabolism in Clematis, the growth, light response curve, A-Ci curve and nitrogen metabolism related enzyme activities of 1-year-old Clematis crassifolia and C. paten ssp. tientaiensis were studied under different ratios of NH4+-N:NO3--N. The results showed that the ratio of NH4+-N:NO3--N significantly affects the biomass and chlorophyll content of clematis, and the biomass, Chl a, Chl b, and Car contents of C. crassifolia reach the maximum under the ratio at 1:1, while the Chl a and Chl b contents of C. paten ssp. tientaiensis reach the maximum under the ratio at 1:3. Under the ratio of 1:1, the light saturation point (LSP) of C. crassifolia and the light compensation point (LCP) of C. paten ssp. tientaiensis were the maximum, and the Vcmax and Jmax values of C. crassifolia leaves were significantly higher than those under other ratios. The glutamine synthetase (GS) activity of C. paten ssp. tientaiensis was the highest under the ratio of 3:1, while NR and nitrite reductase (NiR) activities under the ratio at 1:3 were significantly higher than those under other ratioes. Therefore, the mixed application of NH4+-N and NO3--N could effectively promote the growth and photosynthesis, and enhance the nitrogen utilization efficiency of two Clematis. C. crassifolia was suitable for 1:1 of NH4+-N to NO3--N, while C. paten ssp. tientaiensis was more suitable for 1:3.

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马晓华,胡青荻,章彦君,钱仁卷,郑坚,刘洪见.氮素形态对铁线莲光合特性及氮代谢的影响[J].热带亚热带植物学报,2021,29(3):276~284

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History
  • Received:July 02,2020
  • Revised:September 14,2020
  • Adopted:December 07,2020
  • Online: May 26,2021
  • Published: