Submitted on: 30 September 2012.
Revised on: 16 October 2012.
Accepted on: 11 November 2012.
SEED SCIENCE RESEARCH---CAMBRIDGE UNIV PRESS
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Submitted on: 12 March 2005.
Revised on: 24 April 2005.
Accepted on: 12 May 2005.
SEED SCIENCE RESEARCH---CAMBRIDGE UNIV PRESS