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Submitted on: 04 February 2007.
Revised on: 28 March 2007.
Accepted on: 06 May 2007.
___________________BIOTECHNOLOGIE AGRONOMIE SOCIETE ET ENVIRONNEMENT
Submitted on: 28 July 2001.
Revised on: 11 November 2001.
Accepted on: 15 December 2001.
___________________BIOTECHNOLOGIE AGRONOMIE SOCIETE ET ENVIRONNEMENT
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