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1998 Fiscal Year Final Research Report Summary

Photosynthetic characteristics in rice plants grown under the conditions of low temperature and irradiance.

Research Project

Project/Area Number 09660061
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Plant nutrition/Soil science
Research InstitutionTohoku University

Principal Investigator

MAKINO Amane  Faculty of Agriculture, Tohoku University Associate Professor, 農学部, 助教授 (70181617)

Project Period (FY) 1997 – 1998
Keywordsrice / photosynthesis / growth / nitrogen / low temperature / low irradiance / Rubisco / cool weather damage
Research Abstract

In the northern area of Japan, cool weather damage in summer is always caused not only by low temperature but also by a shortage of sunshine. Under such weather conditions, photosynthesis is : strongly suppressed. However, little is known about how growth under such conditions affects photosynthesis at the level of a single leaf and the growth at the level of the whole plant.
The photosynthetic characteristics and plant growth were examined in rice plants grown at a day/night temperature of 20/18゚C and an irradiance of 350 mutmol quanta m-2 s-1 as the low-temperature/irradiance treatment. The photosynthetic rate measured at 20゚C was a little higher in rice grown under low-temperature/irradiance than in rice grown under 25/20゚C and 1000 mumol m^<-2> s^<-1>, whereas there was no difference in the photosynthetic rate measured at 25゚C between rice grown in these two ways. This difference was suggested to be caused by a slightly enhanced RuBP regeneration capacity in the low-temperature/irradiance-grown plants. The RGR (relative growth rate) were much smaller in the low-temperature/irradiance grown plants, and it was caused by a decreased NAR (netassimilation rate). The LAB (leaf area ratio) was slightly greater. We, thus, concluded that although rice plants are partially able to acclimate to the conditions of low temperature and low irradiance, the suppressed photosynthesis under such conditions directly leads to a decreased biomass production.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] Amane Makino: "Leaf photosynthesis, plant growth and nitrogen allo cation in rice under different irradiances" Planta. 203. 390-398 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Keiko Ohashi: "Gas exchange characteristics in rice (eaves groun under the condi-tions of physiologically low temperature and irradiance" Plant and CeLL PhysioLogy. 39. 1384-1387 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Amane Makino: "Leaf photosynthesis, plant growth and nitrogen allocation in rice under different irradiances" Planta. 203. 390-398 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Keiko Ohashi: "Gas exchange characteristics in rice Leaves grown under the conditions of physiolo-gically low temperature and irradiance" Plant and Cell Physiology. 39. 1384-1387 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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