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RESEARCH ON THE MORPHYLOGY,CYTOLOGY OF ABNORMAL CONDUCTING TISSUE AND MICROSPORANGIUM OF MALE-STERILE PLANTIN CUNNINGHAMIA LANCEOLATA Preliminary Study of Damage to Male Cone of Pinus massoniana by Dioryctria yiai COMPARATIVE STUDIES ON DEVELOPMENTAL ANATOMY, PHYSIOLOGY AND BIOCHEMISTRY OF MICROSTROBILUS BETWEEN MALE STERILE AND FERTILE PLANTS IN CUNNINGHAMIA LANCEOLATA