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1991 Fiscal Year Final Research Report Summary

The Growth and Nitrogen Uptake by Tomato Plants in the Night-time

Research Project

Project/Area Number 02660033
Research Category

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

Allocation TypeSingle-year Grants
Research Field 園芸・造園学
Research InstitutionOkayama University

Principal Investigator

MASUDA Masaharu  Okayama Univ. Fac. of Agriculture. Professor, 農学部, 教授 (90026617)

Project Period (FY) 1990 – 1991
KeywordsTomato / Night-growth / Labeled nitrogen / Mineral transport / Xylem sap analysis / Mineral nutrition
Research Abstract

1. For tomato plants, the growth rate was four-fold greater in weigh in weight in the night-time than in the daytime. However, there was no difference in root elongation rate between night-time and daytime.
2. The mineral transport concentration from root to shoot was investigated by xylem sap analysis. Exudation rate reached maximum near at noon. The nitrate concentration showed a little change, but phosphate concentration increased rapidly from evening, and reached maximum around at 10 : 00 P. M. . In contrast to phosphate, potassium concentration reached maximum around at 10 : 00 A. M. .
Mineral concentrations decreased greatly in shaded plants by 30% of sunlight intensity except phosphate ; the higher phosphate concentration at any time in the shaded plant than in the control one.
The concentrations of nitrate, phosphate, calcium and magnesium decreased as plants aged, whereas potassium concentration did not change irrespective of ages.
3. Night-uptake nitrogen( ^<15>N)was distributed to leaf, stem and root in the ratio of 5 : 1 : 4 in the morning, whereas in the ratio of 7 : 1 : 2 for day-uptake nitrogen. A portion of the night-uptake nitrogen was also transported to the calyx and the peduncle, but not yet to the fruits until the morning.
4. The growth of tomato plants was the greatest under cycles of 4 hours of darkness-20 hours of artificial light(18, 000lux)at 25 C. Tomato plants grown entirely in artificial light exhibited a bend of shoot tip, leaf chlorosis and necrosis caused by the deficiency of calsium and magnesium. Chlorophyll content and green color of leaves were recovered by 1-hour dark interruption.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Masuda,M.: "Uptake of water and minerals during the day and the night in tomato and coucumber plans." J.Jap.Soc.Hort.Sci.58. 951-957 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 桝田 正治: "トマト木部いっ泌液における無機成分濃度の日変化及びその濃度に及ぼす光照度と苗齢の影響." 園学雑.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 桝田 正治: "トマトの栄養特性に関する研究.(第3報)木部いっ泌液の無機成分濃度の日周期性." 園学雑60(別1). 300-301 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 桝田 正治: "トマトの栄養特性に関する研究.(第4報)昼夜間における窒素( ^<15>N)の果実ほの流入" 園学雑61(別1). (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. Masuda: "Uptake of water and minerals during the day and the night in tomato plants." J. Jap. Soc. Hort. Sci.58. 951-957 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Masuda: "Diurnal changes in mineral concentrations of xylem exudate in tomato plants and its concentration as affected by sunlight intensity and plant ages." J. Jap. Soc. Hort. Sci.

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

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Published: 1993-03-16  

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