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首页> 中文期刊> 《农业科学学报：英文版》 >Effects of Nitrogen Forms on Carbon and Nitrogen Accumulation in Tomato Seedling

Effects of Nitrogen Forms on Carbon and Nitrogen Accumulation in Tomato Seedling

         
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摘要

Utilization of organic nitrogen (N) is an important aspect of plant N assimilation and has potential application in sustainable agriculture. The aim of this study was to investigate the plant growth,C and N accumulation in leaves and roots of tomato seedlings in response to inorganic (NH4+-N,NO3--N) and organic nitrogen (Gly-N). Different forms of nitrogen (NH4+-N,NO3--N,Gly-N) were supplied to two tomato cultivars (Shenfen 918 and Huying 932) using a hydroponics system. The plant dry biomass,chlorophyll content,root activity,total carbon and nitrogen content in roots and leaves,and total N absorption,etc. were assayed during the cultivation. Our results showed that no significant differences in plant height,dry biomass,and total N content were found within the first 16 d among three treatments;however,significant differences in treatments on 24 d and 32 d were observed,and the order was NO3--N > Gly-N > NH4+-N. Significant differences were also observed between the two tomato cultivars. Chlorophyll contents in the two cultivars were significantly increased by the Gly-N treatment,and root activity showed a significant decrease in NH4+-N treatment. Tomato leaf total carbon content was slightly affected by different N forms;however,total carbon in root and total nitrogen in root and leaf were promoted significantly by inorganic and organic N. Among the applied N forms,the increasing effects of the NH4+-N treatment were larger than that of the Gly-N. In a word,different N resources resulted in different physiological effects in tomatoes. Organic nitrogen (e.g.,Gly-N) can be a proper resource of plant N nutrition. Tomatoes of different genotypes had different responses under organic nitrogen (e.g.,Gly-N) supplies.

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