[1] AUSTRALIAN NATL UNIV,DEPT BOT,CANBERRA,ACT 2601,AUSTRALIA
[2] CSIRO,DIV PLANT IND,CANBERRA,ACT 2601,AUSTRALIA
[3] UNIV LUND,DEPT BIOCHEM,S-22007 LUND 7,SWEDEN
[4] AUSTRALIAN NATL UNIV,DEPT ENVIRONM BIOL,CANBERRA,ACT 2601,AUSTRALIA
[5] AUSTRALIAN NATL UNIV,DEPT APPL MATH,CANBERRA,ACT 2601,AUSTRALIA