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Submitted on: 28 July 2002.
Revised on: 30 August 2002.
Accepted on: 24 September 2002.
___________________ACTA PHYSIOLOGIAE PLANTARUM---SPRINGER HEIDELBERG
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Submitted on: 20 April 2003.
Revised on: 09 August 2003.
Accepted on: 04 October 2003.
___________________ACTA PHYSIOLOGIAE PLANTARUM---SPRINGER HEIDELBERG
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