supported by the Australian Center for Intemational Agricultural Research(ACIAR);95'Key Project of the China Ministry of Science and Technology,Shandong Comittee of Science and Technology and Shandong Foundation for Natural Science.
supported by Australian Centre for Intemational Agicultural Research(ACLAR);95’Key Project of the China Ministry of Science and Technology,Shandong Committee of Science and Technology and Shandong Foundation for Natural Science.