Effects of nitrogen form on nitrogen absorption and photosynthesis of different wheat genotypes

Abstract

Abstract: The experiment was conducted in hydroponics to investigate the difference of three wheat genotypes on nitrogen absorption,accumulation and photosynthesis under three nitrogen forms (NO₃^-,EAN and NH₄⁺).Nitrogen absorption rate of EAN and NH₄⁺ was significantly higher than that of NO₃^- in different nitrogen concentrations.Particularly in higher concentration,EAN had much higher absorption potential than NH₄⁺.YM158,as a sensitive genotype to EAN,had higher absorption rate of NO₃^- and NH₄⁺,and highest of EAN as compared with LZ953 and JDM.EAN highly promoted the absorption of NO₃^- and NH₄⁺ in YM158 and LZ953,but slightly inhibited that of NO₃^- in JDM.Compared with NO₃^- nutrition and NH₄⁺ nutrition,EAN increased nitrogen accumulation in whole plant and aboveground part,and net photosynthetic rate in leaves of YM158 and LZ953,but slightly increased that of JDM.The results indicate that increased growth of wheat under EAN is associated with enhanced nitrogen absorption,increased nitrogen accumulation and net photosynthetic rate.

Key words: Wheat, Enhanced ammonium nutrition (EAN), Absorption rate, Nitrogen accumulation, Net photosynthetic rate, clone, exponential fertilization, chlorophyll fluorescence

CLC Number:

S143.1

DAI Tingbo, CAO Weixing, JING Qi . Effects of nitrogen form on nitrogen absorption and photosynthesis of different wheat genotypes[J]. Chinese Journal of Applied Ecology, 2001, 12(6): 849-852.

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