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Communication mechanisms between root and shoot in the reduction of photosynthesis during senescence in crop plants under water stress

Research Project

Project/Area Number 11460007
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 作物学
Research InstitutionTokyo University of Agriculture and Technology

Principal Investigator

HIRASAWA Tadashi  Tokyo University of Agriculture and Technology, Faculty of Agriculture, Professor, 農学部, 教授 (30015119)

Co-Investigator(Kenkyū-buntansha) OOKAWA Taiichiro  Tokyo University of Agriculture and Technology, Faculty of Agriculture, Associate Professor, 農学部, 教授 (80213643)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥14,100,000 (Direct Cost: ¥14,100,000)
Fiscal Year 2001: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 2000: ¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 1999: ¥5,100,000 (Direct Cost: ¥5,100,000)
KeywordsCytokinin / Leaf senescence / Nitrogen / Photosynthesis / Rubisco / Rubisco mRNA / Soil moisture / Water stress / イネ / 窒素含量 / 窒素分配 / 光合成遺伝子 / 根 / 土壌水分低下 / 気孔 / 根の機能
Research Abstract

In order to clarify the mechanism of the reduction in photosynthesis during senescence under water stress with reference to root-shoot relations, we investigated photosynthetic rate, content of ribulose-1, 5-bisphosphate carboxylase/oxygenase (Rubisco), which is, a key enzyme of the rate of photosynthesis, and the expression of Rubisco genes during senescence under various conditions.
1. There were close correlations among Rubisco content and the abundances of rbcL and rbcS (genes encoding the large subunit and small subunit of Rubisco, respectively) mRNA of a leaf during the reduction of photosynthetic rate due to senescence.
2. Partitioning of nitrogen decreased to leaves and increased to roots under deficient soil moisture conditions, causing the reduction of leaf nitrogen content and, therefore, photosynthetic rate.
3. There were close correlations among nitrogen content and the abundances of rbcL and rbcS mRNA of a leaf during senescence and the nitrogen topdressing increased their abundances.
4. When plants were treated with exogenous cytokinin, nitrogen content and the abundances of rbcL and rbcS mRNA of a leaf increased without the increase in total nitrogen content of a plant, suggesting that cytokinin might increase the partitioning of nitrogen to leaves.
5. The activity of cytokinin transported from root to shoot decreased in plants grown under deficient soil moisture conditions.
From these results, it was suggested that one of the causal factors in the significant reduction of photosynthetic rate under deficient soil moisture conditions might be the reduction of leaf nitrogen content due to smaller partitioning of leaf nitrogen to leaves and that the levels of cytokinin transported from root to shoot might affect the leaf nitrogen content by changing the nitrogen partitioning.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] Hirasawa, T: "Some characteristics of reduced leaf photosynthesis at midday in maize growing in the field"Field Crops Research. 62. 53-62 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Lu, J: "The effects of irrigantion regimes on the water use, dry matter production and physiological responses of paddy rice"Plant and Soil.. 223. 207-216 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ookawa, T: "Analysis of the factors causing differences in the leaf-senescence pattern between two soybean cultivars, Enrei and Tachinagaha"Plant Production Science. 4. 3-8 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Miyamoto, N: "Hydraulic conductivity of rice roots"Journal of Experime ntal Botany.. 52. 1835-1846 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 三王裕見子: "湛水直播栽培した水稲の生育と倒伏およびこれに関係する性質の品種間差"日本作物学会紀事. 70. 515-524 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 三王裕見子: "湛水直播栽培した水稲タカナリの乾物生産特性-慣行移植栽培した水稲との比較"日本作物学会紀事. 71(印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] O.Ito(編): "Genetic Improvement of Rice for Water-Limited Environments"International Rice Rescarch Institute. 353 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hirasawa, T.: "Some characteristics of reduced leaf photsynthesis at midday in maize growing in the field"Field Crops Research. Vol.62. 53-62 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ito, O.: "Genetic Improvement of Rice for Water-Limited Environments"Rice Research Institute. 353.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Lu, J.: "The effects of irrigation regimes on the water use"dry matter production and physiological responses of paddy rice. Vol.223. 207-216 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ookawa, T.: "Analysis of the factors causing differences in the leaf-senescence pattern between two soybean cultivars, Enrei and Tachinagaha"Plant Production Science. Vol.4. 3-8 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Miyamoto, N.: "Hydraulic conductivity of rice roots"Journal of Experimental Botany. Vol.52. 1835-1846 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] San-Oh, Y.: "Varietal differences in growth, lodging and related characters of rice plants broadcasted in submerged paddy field at different densities"Japanese Journal of Crop Science. 2001. 515-524

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] San-Oh, Y.: "Characteristics of dry matter production in direct-sown plants in submerged paddy field of rice cultivar, Takanari compared with conventionally transplanted plants"Japanese Journal of Crop Science. In press. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 大川 泰一郎: "サイトカイニン散布および窒素追肥が登熟期の水稲葉身のリブロース-1, 5-ビスリン酸カルボキシラーゼ/オキシゲナーゼ含量およびrbcL, rbcSの転写蓄積量に及ぼす影響"日本作物学会紀事. 70.別1. 54-55 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Kondo A.: "Cytokinin level in root exudates and leaf senescence after flowering in maize plants"Proceedings of the 6^<th> Symposium of the International Society of Root Research. 232-233 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 平沢 正: "「葉ざし」水稲の葉身の老化過程における光合成速度の低下に及ぼす根一部切除と根からのサイトカイニン注入の影響"日本作物学会関東支部会報. 16号. 46-47 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 成岡 由規子: "登熟期の老化程度が異なる水稲品種日本晴とアケノホシの葉身窒素含量の相違とその要因"日本作物学会関東支部会報. 16号. 48-49 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 平沢 正: "開花期以前の土壌水分条件が登熟期間中のトウモロコシの葉の老化に及ぼす影響"日本作物学会関東支部会報. 16号. 38-39 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 三王 裕見子: "湛水直播栽培した水稲タカナリの乾物生産特性-慣行移植栽培した水稲との比較-"日本作物学会紀事. 71(印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] OOKAWA,Taiichiro: "Analysis of the factors causing differences in the leaf-senescence pattern between two soybean cultivars, Enrei, and Tachinagaha."Plant Production Science. 4・1. 3-8 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] LU,Jun: "The effects of irrigation regimes on the water use, dry matter production and physiological responses of paddy rice."Plant and Soil. 223. 207-216 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 大川泰一郎: "サイトカイニン散布および窒素追肥が登熟期の水稲葉身のリブロース-1,5-ビスリン酸カルボキシラーゼ/オキシゲナーゼ含量およびrbcL,rbcSの転写蓄積量に及ぼす影響"日本作物学会紀事. 70・別1(印刷中). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 近藤晃代: "開花期以後葉身の緑色程度の減少が異なるトウモロコシ系統の葉の光合成速度と窒素含量,木部液の窒素含量とサイトカイニン活性の比較"日本作物学会紀事. 69・別2. 112-113 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Hirasawa,T: "Some characteristics of reduced leaf photosynthesis at midday in maize growing in the field"Field Crops Research. 62(1). 53-62 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hirasawa,T: "Physiological characterization of the rice plant for tolerance of water deficit"In Genetic Improvement of Rice for Water-Limited Environments, IRRI. 89-98 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 大川泰一郎: "登熟期における水稲葉身の窒素含量と光合成速度、リブロ一ス1,5-ビスリソカルポキシラーゼ含量の関係および根から地上部に送られるサイトカイニン"日本作物学会紀事. 62(別2). 76-77 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 山崎武仁: "登熟期における水稲品種アケノホシと日本晴の葉身窒素含量が異なる要因"日本作物学会紀事. 62(別2). 78-79 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 柳原里子: "低土壌水分条件下で老化によって水稲の葉の光合成速度が低下する要因"日本作物学会関東支部会報. 14. 56-57 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 中神弘詞: "低土壌水分条件がコムギの出液中の無機イオン量、サイトカイニン活性および葉の老化に及ぼす影響"日本作物学会関東支部会報. 14. 74-95 (1999)

    • Related Report
      1999 Annual Research Report

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

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