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Analysis of factors of growth stimulation by aluminum in roots of tea plants

Research Project

Project/Area Number 13660063
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

YOKOTA Hiromi  Shizuoka University, Faculty of Agriculture, Professor, 農学部, 教授 (50115458)

Co-Investigator(Kenkyū-buntansha) MORITA Akio  Shizuoka University, Faculty of Agriculture, Associate Professor, 農学部, 助教授 (20324337)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2003: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥2,900,000 (Direct Cost: ¥2,900,000)
KeywordsAluminum / Tea plants / Growth stimulation / Oxidative stress / Antioxidant system / Antioxidative enzymes / Phenolics metabolism / Aging / シュウ酸 / フェノール類 / 細胞壁 / 活性酸素
Research Abstract

In this study, stimulatory effect of aluminum (Al) on the growth of roots of tea plants were studied. Follows are summary of the results:
1.The growth of rooted cuttings, cultured tea cells and seedlings of tea plants were stimulated by Al, irrespective of phosphate levels.
2.Lignin content, wall-bound phenolics contents were reduced by Al. Key enzyme of phenolic metabolism, phenylalanine-ammonia lyase (PAL) activity, and peroxidase (PO) activity were determined. PAL activity of roots of rooted cuttings and seedlings were clearly decreased by Al. The activity of soluble, ionically-bound, and covalently-bound PO also decreased by Al in all samples.
3.Effects of Al on lipid peroxidation, H_2O_2 contents, and on the activities of antioxidant enzymes (catalase : CAT, ascorbic acid peroxidase : APX and superoxide dismutase : SOD) were examined. Lipid peroxidation and H_2O_2 contents were decreased by Al treatment in tea rooted cuttings, tea seedlings and cultured tea cells. The activities of CAT, APX and SOD were increased by Al treatment in tea plants.
4.3-AT, an inhibitor of CAT, inhibited the activity of CAT completely, but H_2O_2 contents were not affected. It is considered that the reduction of H_2O_2 contents in Al treatment is carried out by APX and/or low molecular antioxidative substances. Effect of NaCl was also examined in tea cells. Increase of lipid peroxidation and the increase of H_2O_2 contents were observed.
5.From the results in the reduction of oxidative stress and the effect of Al on phenolic metabolism, the maintenance of membrane stability and retardation of aging were guessed as the factors for growth stimulation or growth differences between Al treated and non-Al treated tea plants.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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