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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (5): 859-.doi: 10.19802/j.issn.1007-9084.2020192

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Impact of elevated atmospheric CO2 concentration on carbohydrate accumulation in different organs of soybean plant

  

  1. 1. College of Resource and Environment,Northeast Agricultural University,Harbin 150030,China; 2. Key Laboratory of Mollisols Agroecology,Northeast Institute of Geography and Agroecology,CAS,Harbin 150081,China
  • Online:2021-11-01 Published:2021-11-01

Abstract: Understanding the effect of elevated atmospheric CO2 concentration on the accumulation of non-structural carbohydrates can fill the gaps for climate change biology of soybeans, and provide theoretical support for breeding soybean varieties that adapt to future climate conditions and high-yield cultivation strategies. In this study, four soybean cultivars, i.e., Zihua 4 (ZH4), Xiaohuangjin (XHJ), Fengshou 10 (FS10), and Nengfeng 1 (NF1) were cultivated under the ambient atmospheric carbon dioxide concentration (aCO2) and eCO2 (550 μmol·mol-1) conditions simulated by open top chamber (OTC) system. The results indicated that the effect of eCO2 on C concentration of different organs varied among cultivars. Except for the significant decrease in leaves C concentration at R5 stage for cultivar XHJ and root C concentration at R8 stage for cultivar NF1, the C concentration of different organs showed an increased tendency. Moreover, the increase of atmospheric CO2 concentration significantly enhanced the soluble sugar concentration of soybean leaves at the R5 stage by 33.4%-90.0%, while the responses of sucrose and starch concentrations in plant organs to eCO2 varied among cultivars. The sucrose concentration in the XHJ leaves and the starch concentration in the FS10 leaves decreased by 9.7% and 13%, respectively, while the sucrose and starch concentrations of the leaves in other cultivars increased significantly. At the R8 stage, the concentration of soluble sugar, sucrose and starch in soybean seeds all showed an increasing trend to eCO2, and the soluble sugar concentration in seeds increased by 22% on average. Compared to R5, the carbohydrate concentration in vegetative organs decreased significantly under eCO2, implying the utilization efficiency of the carbohydrate in the vegetative organs during the reproductive period plays a key role in soybean yield formation. The yield in cultivars ZH4, XHJ and FS10 increased by 32.7% on average, while the yield of cultivar NF1 did not increase significantly. According to the results of four soybean cultivars, the C assimilation ability was increased by eCO2, whereas considerable variations of C assimilation ability in response to eCO2 among different cultivars need to be appreciated. The cultivars, which have strong sucrose converting ability in leaf (source), high efficiency in sugars loading and unloading in stem (flow), and high sink capacity, are worthy of further attention in future soybean breeding program and production.

Key words: soybean, total soluble sugar, sucrose, starch, climate change

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