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http://dx.doi.org/10.5532/KJAFM.2022.24.4.275

Impact of Climate Change on Yield and Canopy Photosynthesis of Soybean  

Wan-Gyu, Sang (National Institute of Crop Science, Rural Development Administration)
Jae-Kyeong, Baek (National Institute of Crop Science, Rural Development Administration)
Dongwon, Kwon (National Institute of Crop Science, Rural Development Administration)
Jung-Il, Cho (National Institute of Crop Science, Rural Development Administration)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.24, no.4, 2022 , pp. 275-284 More about this Journal
Abstract
Changes in air temperature, CO2 concentration and precipitation due to climate change are expected to have a significant impact on soybean productivity. This study was conducted to evaluate the climate change impact on growth and development of determinate soybean cultivar in the southern parts of Korea. The high temperature during vegetative period, which does not accompany the increase of CO2 concentration, increased the canopy photosynthetic rate in soybean, but after flowering, the high temperature above the optimal ranges interrupts the photosynthetic metabolism. In yield and yield components, high temperature reduced both the pod and seed number and single seed weight, resulting in a reduction of total seed yield. On the other hand, the increase in CO2 concentration dramatically increased the canopy photosynthetic rate over the whole growth period. In addition, high CO2 concentration increased the number of pods and seeds, which had a positive effect on total seed yield. Under concurrent elevation of air temperature and CO2 concentration, canopy photosynthesis increased significantly, but enhanced canopy photosynthesis did not lead to an increase in soybean seed yield. The increase in biomass and branch by enhanced canopy photosynthesis seems to be attributed to an increase in the total number of pods and seeds per plant, which compensates for the negative effects of high temperature on pod development. However, Single seed weight tended to decrease rapidly by high temperature, regardless of CO2 concentration level. Elevated CO2 concentration did not compensate for the poor distribution of assimilations from source to sink caused by high temperature. These results show that the damage of future soybean yield and quality is closely related to high temperature stress during seed filling period.
Keywords
Climate change; Soybean; Photosynthesis; SPAR system;
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