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Journal of Integrative Agriculture  2021, Vol. 20 Issue (10): 2639-2651    DOI: 10.1016/S2095-3119(20)63560-2
Special Issue: 油料作物合辑Oil Crops
Crop Science Advanced Online Publication | Current Issue | Archive | Adv Search |
Effects of drought stress on root morphology and spatial distribution of soybean and adzuki bean
Hyen Chung CHUN, Sanghun LEE, Young Dae CHOI, Dong Hyeok GONG, Ki Youl JUNG
Crop Production Technology Research Division, National Institute of Crop Science, Miryang-si 50424, Republic of Korea
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Due to global climate change, Korea is facing severe droughts that affect the planting and early vegetative periods of upland crops.  Soybean and adzuki bean are important legume crops in Korea, so it is critical to understand their adaptations to water stress.  This study investigated the changes in root morphological properties in soybean and adzuki bean and quantified the findings using fractal analysis.  The experiment was performed at the National Institute of Crop Science in Miryang, Korea.  Soybeans and adzuki beans were planted in test boxes and grown for 30 days.  The boxes were filled with bed soil with various soil moisture treatments.  Root images were obtained and scanned every two days, and the root properties were characterized by root length, depth and surface area, number of roots, and fractal parameters (fractal dimension and lacunarity).  Root depth, length and surface area and the number of roots increased in both crops as the soil moisture content increased.  The fractal dimension and lacunarity values increased as the soil moisture content increased.  These results indicated that the greater the soil moisture, the more heterogeneous the root structure.  Correlation analysis of the morphological properties and fractal parameters indicated that soybean and adzuki bean had different root structure developments.  Both soybean and adzuki bean were sensitive to the amount of soil moisture in the early vegetative stage.  Soybean required a soil moisture content greater than 70% of the field capacity to develop a full root structure, while adzuki bean required 100% of the field capacity.  These results would be useful in understanding the responses of soybean and adzuki bean to water stress and managing irrigation during cultivation.
Keywords:  soybean        adzuki bean        root        morphology        fractal dimension        soil water content  
Received: 30 April 2020   Accepted:
Fund: This research was performed and funded by an Agenda Project of the Rural Development Administration (PJ 013482022020), Republic of Korea.
Corresponding Authors:  Correspondence Hyen Chung Chun, Tel: +82-55-350-1262, Fax: +82-55-353-3059, E-mail:   

Cite this article: 

Hyen Chung CHUN, Sanghun LEE, Young Dae CHOI, Dong Hyeok GONG, Ki Youl JUNG. 2021. Effects of drought stress on root morphology and spatial distribution of soybean and adzuki bean. Journal of Integrative Agriculture, 20(10): 2639-2651.

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