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

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Abstract

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.

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Abbreviations

DF:

Driving force of water flow

ETP:

Potential evapotranspiration

Kplant :

Plant hydraulic conductance

Ksl :

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

RLD:

Root length density

T:

Transpiration rate per unit leaf area

TRL:

Total root length

ψleaf :

Leaf water potential

ψpd :

Predawn leaf water potential

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Authors and Affiliations

  1. Hokkaido University of Education, Sapporo campus, 5-3-1 Ainosato, Kita-ku, Sapporo, 002-8502, Japan

    Tetsuhisa Deguchi

  2. Graduate School of Agriculture, Hokkaido University, N9 W9 Kita-ku, Sapporo, 060-8589, Japan

    Kazuto Iwama, Manabu Matsumoto & Jyun Tanigawa

Authors
  1. Tetsuhisa Deguchi
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  2. Kazuto Iwama
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  3. Manabu Matsumoto
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  4. Jyun Tanigawa
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Correspondence to Kazuto Iwama.

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Deguchi, T., Iwama, K., Matsumoto, M. et al. Effect of Varietal Difference in Root System on Hydraulic Conductance in Potatoes Under Different Soil Water Conditions and Planting Dates. Potato Res. 58, 103–119 (2015). https://doi.org/10.1007/s11540-015-9289-1

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