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Differential Tolerances Among Tropical Forage Crops to Water Deficit Conditions.

Research Project

Project/Area Number 01560076
Research Category

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

Allocation TypeSingle-year Grants
Research Field 土壌・肥料
Research InstitutionHiroshima University

Principal Investigator

SANEOKA Hirohumi  Hiroshima Univ. Appl. Biol. Sci., Assoc. Prof., 生物生産学部, 助教授 (70162518)

Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1990: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1989: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsDrought tolerance / Relative growth rate / ^<14>CO_2 assimilates / Water movement / Fritiated water / Resistance to water How / トレ-サ-実験 / 膜脂質 / 水の代謝 / ロ-ズグラス / ハトムギ / トウモロコシ / 水ストレス / 浸透調整 / リン脂質 / 細胞膜安定性
Research Abstract

The objective of this study are evaluation of morphological and physiological adaptation of the crops to water stress conditions to estimate their drought to lerant ability. Plant were grown foth in green house, field condition and water culture and subjected to sequence to water stress. The plant growth of tested plants was Affected remarkably due to water stress. The Relative Growth Rate (RGR) and Net Ossimilation Rate (NAR) decreased under stress conditions and significant differences were observed between crop species. The reduction percentage in RGR and NAR under water stress condition was used as an indicator of tolerances to drought. It was low in Rhodesgrass and high in Jod's tears. However, Leaf Area Ratio (LAR) was not effected by stress. The photosynthetic rate was reduced due to water stress, spedially in Job's tears. Water use efficiency in Rhodesgrass was increased by strees, whereas that of Job's tears was severely decreased. Rhodesgrass was capable of maintaining photos … More ynthetic production under stress and therefore RGR and NAR were not decreased considerably compared to other crops under stress conditions. ^<14>C aseimitates remedied in leaves and stems and the tanslocation of ^<14>C assimilates from leaves to rots was remarkably reduced under stress conditions in sorghum and Job's tears. ^<14>C content in high-molecular weight constituents such as protein and ligin-cellulose fraction in rots was apparently reduced by stress in Job's tears. And also root hydrautic conductivity (RAC) was considerably longer due to stress. The RHC of Rhodesgrass was there times longer than of Job's tears. The movement of ^3H_2O through plant were remerbobly reduced in both species under water stress. Twenty-Foun hours after added of ^3H_2O, the relative radioactivity in tissue water of root, stem, expanded leaves and ehponding leaves were 15, 45, 9.5 and 8.5% respectively, compared to that of nutrient solution on Rhodeagrass. The respective values in Job's tears were 48, 17, 5.1 and 3.8%. The movement of ^3H_2O from root to shoots, especially to leaves was strongly restrictebl in Job's tears compared to Rhodesgrass. The results indicated that the resistance to water how through plants differ among species according with their drought to lerant ability. The major resistance to water how through plant appers to be exist in the nodes and for the basal stems which are located in transit positions appears from organ to another. Less

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] G.S.Premachandra,H.Saneoka,M.Kanaya and S.Ogata: "Cell membrase stability and leaf surface wax content as affected by increasing watern deficits in maize." J.Exp.Bot.42. 167-171 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 実岡 寛文・尾形 昭逸: "暖地型飼料作物の根から地上部への水の移動と根,茎,および葉への水の分配に及ぼす水ストレスの影響" 日本土壌肥料学雑誌. 61. 472-478 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] G. S. Prenachandra, H. Saneoka, M. Kanaya and S. Ogata: "Cell membrane stability and loaf surface wax content as affected by increasing water deficits in maize" J. Exp. Bot.Vol 42. 167-171 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hirohomi SANEOKA and Shoitsu OGATA: "Effect of water stress on the movement and distribution of water through the plants of forage crops" Jpn. J. Soil Sci. Plant Notr.Vol 61. 472-478 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] G.S.Premachandra,H.Saneoka,M.Kanaya and S.Ogata: "Cell membrane stability and leaf surface wax content as affected by incrosing water deficrts in maize." J.Exp.Bot.42. 167-171 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 実岡寛文・尾形昭逸: "暖地型飼料作物の根から地上部への水の移動と根,茎および葉への水の分配に及ぼす水ストレスの影響" 日本土壌肥料学雑誌. 61. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 実岡寛文: "暖地型飼料作物の水ストレス耐性機構-根と茎の間などの境界部位での通導抵抗性の違いがポイント-" 化学と生物. 28. 149-151 (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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