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Evaluation of bypass flow of root system of woody plants

Research Project

Project/Area Number 11660153
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 林学
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

YAHATA Hisashi  Inst.of Tropical Agriculture, KYUSHU UNIVERSITY, Prof., 熱帯農学研究センター, 教授 (90038290)

Co-Investigator(Kenkyū-buntansha) SHIROTA Tetsuou  Inst.of Tropical Agriculture, KYUSHU UNIVERSITY, Post doctoral, 熱帯農学研究センター, 非常勤研究員
KOBAYASHI Yoshichika  Fac.of Agriculture, KYUSHU UNIVERSITY, Prof., 農学研究院, 教授 (90087594)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1999: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordssalinity tolerance / NaCl / bypass flow / Casparian bands / pyranine fluorescence dye / woody species / 電子スピン共鳴 / フリーラジカル / NaCl / カスパリー線 / 蛍光物質 / ピラニン
Research Abstract

The salinity tolerance of plants may be affected by the size of bypass flow, which indicates a passive flow of ions through the apoplastic flow with a lack of Casparian bands at the endodermis and hypodermis of roots. We examined the size of bypass flow, using pyranine fluorescence dye, of two woody species, a salt tolerant(Euonymus japonicus)and non-tolerant species(Osmanthus fragrans var.aurantiacus).
1)The bypass flow of woody plants showed fairly greater than that of crops such as rice and wheat. O.fragrans had a bigger bypass than E.japonicus. Although the Na ion uptake was estimated using the bypass flow, the actual uptake was lower than the estimated ones. This difference may be considered to be the existence of active exclusion of Na ion at the roots. The bypass flow varied with season probably because of the development of lateral roots.
2)The fluorescence microscopic observation of roots treated by a dye, CBS, showed that both species had the exodermises, and the decay part ot root affectde the bypass flow
3)The optimal quantum yields(Fv/Fm) using MINI-PAM was measured after the saline and the drought treatments for one month under the two levels to light intensities in a green house. The value of Fv/Fm of O.fragrans decreased in the saline water treatment than the drought treatment, while E.japonicus showed the opposite response of O.fragrans which meant O.fragrans is sensitive to saline. The down regulation was observed under the stronger light condition when the stress were applied. An unkown free radical measured with ESR(electron spin resonance) increased significantly in the leaves of O.fragrans when stressed by saline.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] Inoue, I, Shirota, T.and Yahata, H.: "Studies on the root bypass flow in relation to the salt tolerance of woody plants"Bulletinn of Kyushu Branch on the Japanese Forestry Society. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 井上義之,城田徹央,矢幡久: "樹木の耐塩性に及ぼす根系のバイパスフローに関する研究"日本林学会九州支部研究論文集. (印刷中). (2001)

    • Related Report
      2000 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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