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The Mechanism of Drought Tolerance in Potato Varieties

Research Project

Project/Area Number 04660011
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 作物
Research InstitutionHokkaido University

Principal Investigator

IWAMA Kazuto  Hokkaido Univ., Crop Science, Associate Professor, 農学部, 助教授 (70144219)

Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1992: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsDROUGHT TOLERANCE / DRY MATTER PRODCUTION / GRAFTING PLANTS / POTATO / ROOT LENGTH / TRANSPIRATION RATE / VARIETAL DIFFERENCE / WATER ABSORPTION RATE / 根の品種間差異 / 品種間差異 / 水分吸収 / 根長 / 気孔抵抗 / 接木
Research Abstract

The relationship between the drought tolerance and the root system was investigated with two maincrop potato varieties (Norin 1 and Konafubuki) cultivated in Hokkaido area. In the first experiment, the varietal difference in root system was identified under the field conditions ; the total root length at the maximum developmental stage of root system was 15.9 km/m^2 in Norin 1 and 11.1 km/m^2 in Konafubuki. In the second experiment with the grafting plants between these two varieties grown in pots, it was clarified that the varietal difference in the amount of roots was mainly due to the inherent characteristic in the stock. In the third experiment, the diurnal change in water absorption rate (WAR) was compared between two varieties grown in pots under different soil water conditions. Although the amount of roots less affected the WAR dt the wet plot, the restriction of WAR at the dry plot was larger in Konafubuki than in Norin 1. Finally, in the fourth experiment conducted under field conditions with different soil water treatments, the relationships of the root system with the reduction of transpiration rate and dry matter production at the dry soil condition relative to the wet soil condition was quantitatively identified.
From these results, we concluded that the varietal difference in the root system related to the drought tolerance in potato. A genetic improvement of the amount of roots will be valuable to increase a drought tolerance of potato varieties. In addition, the present results suggested that even if deep soils were plentifully wet, some shortage of water inevitably occurred in potato plants when surface soils became dry. The root within surface soils may be superior to those in deep soils with respect to water absorption ability.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 高田治: "根量を異にするバレイショ品種の相反接木植物における水ストレスの影響" 日本作物学会紀事. 61(別2). 167-168 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] 岩間和人: "ダイナゲージによるバレイショの茎流速度の測定" 日本作物学会紀事. 61(別2). 169-170 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] 岩間和人: "バレイショにおける茎流速度の日変化-ポット個体における土壌の乾燥区と適湿区の比較-" 日本作物学会紀事. 62(別2). 201-202 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Iwama,K.: "Influence of planting density on root growth and yield in potato" Jpn.J.Crop Sci.62(4). 628-635 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Iwama,K.: "The diurnal change in water absroption rate of potatoes at different soil water conditions" International symposium on soil moisture control in arid to semi-arid region for agro-forestry. (印刷中). (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] 岩間 和人: "ダイナゲージによるバレイショの茎流速度の測定" 日本作物学会紀事. 61(別2). 169-170 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 高田 治: "根量を異にするバレイショ品種の相反接木植物における水ストレスの影響" 日本作物学会紀事. 61(別2). 167-168 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 福嶋 淑恵: "栽植密度がばれいしょ根系の発達に及ぼす影響" 日本作物学会紀事. 61(別2). 165-166 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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