Interactive Effects of Elevated CO2 and N Fertilization on Yield and Quality of Tomato Grown Under Reduced Irrigation Regimes

Frontiers in Plant Science

卷:9

Taisheng Du¹  Fulai Liu²  Liang Fang²  Zhenhua Wei²  Xiangnan Li³ 

[1] Center for Agricultural Water Research in China, China Agricultural University, Beijing, China;

[2] Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Copenhagen, Denmark;

[3] Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China;

关键词: CO2;    nitrogen;    reduced irrigation;    yield;    fruit quality;    tomato;   

DOI  :  10.3389/fpls.2018.00328

来源: DOAJ

【 摘 要 】

The interactive effects of CO2 elevation, N fertilization, and reduced irrigation regimes on fruit yield (FY) and quality in tomato (Solanum lycopersicum L.) were investigated in a split-root pot experiment. The plants were grown in two separate climate-controlled greenhouse cells at atmospheric [CO2] of 400 and 800 ppm, respectively. In each cell, the plants were fertilized at either 100 or 200 mg N kg-1 soil and were either irrigated to full water holding capacity [i.e., a volumetric soil water content of 18%; full irrigation (FI)], or using 70% water of FI to the whole pot [deficit irrigation (DI)] or alternately to only half of the pot [partial root-zone irrigation (PRI)]. The yield and fruit quality attributes mainly from sugars (sucrose, fructose, and glucose) and organic acids (OAs; citric acid and malic acid) to various ionic (NH4+, K+, Mg2+, Ca2+, NO3-, SO42-, and PO43-) concentrations in fruit juice were determined. The results indicated that lower N supply reduced fruit number and yield, whereas it enhanced some of the quality attributes of fruit as indicated by greater firmness and higher concentrations of sugars and OAs. Elevated [CO2] (e[CO2]) attenuated the negative influence of reduced irrigation (DI and PRI) on FY. Principal component analysis revealed that the reduced irrigation regimes, especially PRI, in combination with e[CO2] could synergistically improve the comprehensive quality of tomato fruits at high N supply. These findings provide useful knowledge for sustaining tomato FY and quality in a future drier and CO2-enriched environment.

【 授权许可】

Unknown