Potato Research

, Volume 58, Issue 2, pp 103–119 | Cite as

Effect of Varietal Difference in Root System on Hydraulic Conductance in Potatoes Under Different Soil Water Conditions and Planting Dates

  • Tetsuhisa Deguchi
  • Kazuto IwamaEmail author
  • Manabu Matsumoto
  • Jyun Tanigawa


To improve drought resistance of potato (Solanum tuberosum L.), we bred four varieties with large root mass and registered them as Konyu-1 to Konyu-4 in 2007. In the present study, two experiments were conducted to clarify the effect of improved root system on plant hydraulic conductance (Kplant) and drought resistance under field conditions. In the first experiment, Kplant and total root length (TRL) were compared for three Konyu varieties (Konyu-1, Konyu-2, Konyu-4) and Konafubuki (check variety with small root mass) cultivated under irrigated and droughted conditions. In the second experiment, the effect of three different planting dates on Kplant and TRL was compared for Konyu-4 and Konafubuki. Regardless of soil water conditions and planting dates, Konyu varieties showed higher Kplant compared with Konafubuki. In addition, a close positive relationship between TRL and Kplant was observed in both experiments. Konyu varieties also showed higher leaf water potential (ψleaf) regardless of soil water conditions and planting dates, resulting in a smaller reduction in transpiration rate per leaf area (T) under droughted condition. Present results indicated the contribution of root system improvement in potato crop to drought resistance on the basis of plant hydraulics. Improved TRL of Konyu varieties contributed to enhance Kplant and to maintain higher ψleaf and T under droughted condition.


Drought resistance Hydraulic conductance Leaf water potential Potato (Solanum tuberosum L.) Root length Varietal difference 



Driving force of water flow


Potential evapotranspiration


Plant hydraulic conductance


Hydraulic conductance from the soil through the roots to the upper fully expanded leaves


Root length density


Transpiration rate per unit leaf area


Total root length


Leaf water potential


Predawn leaf water potential


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Copyright information

© European Association for Potato Research 2015

Authors and Affiliations

  • Tetsuhisa Deguchi
    • 1
  • Kazuto Iwama
    • 2
    Email author
  • Manabu Matsumoto
    • 2
  • Jyun Tanigawa
    • 2
  1. 1.Hokkaido University of EducationSapporoJapan
  2. 2.Graduate School of AgricultureHokkaido UniversitySapporoJapan

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