Changes of growth, photosynthesis and alteration of leaf antioxidative defence system of tea [Camellia sinensis (L.) O. Kuntze] seedlings under ... View Full Text


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Article Info

DATE

2012-08-01

AUTHORS

Mainaak Mukhopadyay, Pranay Bantawa, Akan Das, Bipasa Sarkar, Biswajit Bera, Parthadeb Ghosh, Tapan Kumar Mondal

ABSTRACT

Tea [Camellia sinensis (L.) O. Kuntze] is an aluminum (Al) hyperaccumulator plant and is commercially important due to its high content of antioxidants. Although Al induced growth is well-known for the plants growing in acid soil, yet the cause underlying the stimulatory effect of Al has not been fully understood. To investigate the possible role of Al in growth induction, we studied morphological, physiological as well as biochemical changes of tea plant under different Al concentrations (0–4,000 μM). In hydroponics, Al (15 μM), enhanced shoot and root growth, but at higher concentrations, it caused oxidative damage which culminated in a cascade of biochemical changes, Al content increased concurrently with the maturity of the leaf as well as stem tissues than their younger counterparts. Hematoxylin staining indicated that Al accumulation started after 6 h of exposure in the tips of young roots and accumulation was dose dependent. The physiological parameters such as pigments, photosynthetic rate, transpiration and stomatal conductance were declined due to Al toxicity. Alteration in activated oxygen metabolism was also evidenced by increasing lipid peroxidation, membrane injury, evolution of superoxide anions and accumulation of H2O2. Contents of phenols initially exhibited an acceleration which gradually plummeted at higher levels whereas total sugar and starch contents decimated beyond 15 μM of Al concentration. Activities of antioxidant defense enzymes were increased with the elevated concentration of Al. Expression of citrate synthase gene was up-regulated in the mature leaves, young as well as old roots simultaneously with increased concentration of Al in those parts; indicating the formation of Al-citrate complex. These results cooperatively specified that Al concentration at lower level promoted growth but turned out to be a stressor at elevated stages indicating the sensitivity of the cultivar (T-78) to Al. More... »

PAGES

1141-1154

References to SciGraph publications

  • 2009-05-24. Overexpression of Citrus junos mitochondrial citrate synthase gene in Nicotiana benthamiana confers aluminum tolerance in PLANTA
  • 1998-04. Distribution and chemical speciation of aluminum in the Al accumulator plant, Melastoma malabathricum L. in PLANT AND SOIL
  • 2003-12. Plant improvement for tolerance to aluminum in acid soils – a review in PLANT CELL, TISSUE AND ORGAN CULTURE (PCTOC)
  • 2010-11-16. Effects of aluminium on ultrastructure and antioxidant activity in leaves of tea plant in ACTA PHYSIOLOGIAE PLANTARUM
  • 2010-04-27. Localization of aluminium in tea (Camellia sinensis) leaves using low energy X-ray fluorescence spectro-microscopy in JOURNAL OF PLANT RESEARCH
  • 2005-10. Effects of Aluminum on the Growth of Tea Plant and Activation of Antioxidant System in PLANT AND SOIL
  • 2012-02-21. Identification of Differentially Expressed Gene Profiles in Young Roots of Tea [Camellia sinensis (L.) O. Kuntze] Subjected to Drought Stress Using Suppression Subtractive Hybridization in PLANT MOLECULAR BIOLOGY REPORTER
  • 2006-07-07. Aluminium in tea plantations: mobility in soils and plants, and the influence of nitrogen fertilization in ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
  • 2008-02-28. Bacterial citrate synthase expression and soil aluminum tolerance in transgenic alfalfa in PLANT CELL REPORTS
  • 2010-09-19. Differential responses of oat genotypes: oxidative stress provoked by aluminum in BIOMETALS
  • 2004-12. Responses of Camellia sinensis to Drought and Rehydration in BIOLOGIA PLANTARUM
  • Identifiers

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    http://scigraph.springernature.com/pub.10.1007/s10534-012-9576-0

    DOI

    http://dx.doi.org/10.1007/s10534-012-9576-0

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    28 schema:description Tea [Camellia sinensis (L.) O. Kuntze] is an aluminum (Al) hyperaccumulator plant and is commercially important due to its high content of antioxidants. Although Al induced growth is well-known for the plants growing in acid soil, yet the cause underlying the stimulatory effect of Al has not been fully understood. To investigate the possible role of Al in growth induction, we studied morphological, physiological as well as biochemical changes of tea plant under different Al concentrations (0–4,000 μM). In hydroponics, Al (15 μM), enhanced shoot and root growth, but at higher concentrations, it caused oxidative damage which culminated in a cascade of biochemical changes, Al content increased concurrently with the maturity of the leaf as well as stem tissues than their younger counterparts. Hematoxylin staining indicated that Al accumulation started after 6 h of exposure in the tips of young roots and accumulation was dose dependent. The physiological parameters such as pigments, photosynthetic rate, transpiration and stomatal conductance were declined due to Al toxicity. Alteration in activated oxygen metabolism was also evidenced by increasing lipid peroxidation, membrane injury, evolution of superoxide anions and accumulation of H2O2. Contents of phenols initially exhibited an acceleration which gradually plummeted at higher levels whereas total sugar and starch contents decimated beyond 15 μM of Al concentration. Activities of antioxidant defense enzymes were increased with the elevated concentration of Al. Expression of citrate synthase gene was up-regulated in the mature leaves, young as well as old roots simultaneously with increased concentration of Al in those parts; indicating the formation of Al-citrate complex. These results cooperatively specified that Al concentration at lower level promoted growth but turned out to be a stressor at elevated stages indicating the sensitivity of the cultivar (T-78) to Al.
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