广西北部地区腐霉种类和地理分布研究

从广西北部地区作物根围采集土壤标样323个,分离纯化出腐霉菌株260个,共15种。其中7种为广西新记录,即棘腐霉Pythiumacanthicum,浮游腐霉P.aquatile,宽雄腐霉P.dissotocum,缺性腐霉P.elongatum,孤雌腐霉P.amasculinum,禾生腐霉P.graminicola,绚丽腐霉P.pulchrum。优势种为瓜果腐霉P.aphanidermatum,其余7种为刺腐霉P.spinosum,德里腐霉P.deliense,昆明腐霉P.kunmingense,南宁腐霉P.nanningense,刺器腐霉P.acanthophoron,终极腐霉P.ultimum,镰雄腐霉P.falciforme。同时对腐霉的地理分布情况进行了初步探讨,发现腐霉分布有着明显的地域性。

SPECIES OF THE GENUS PYTHIUM AND THEIR GEOGRAPHICAL DISTRIBUTION IN THE NORTH OF GUANGXI

260 strains of the genus Pythium were isolated from 323 soil materials collected from the north of Guangxi Zhuang Autonomous Region of China. Fifteen species were identified. Among them, Pythium acanthicum, p.aquatile, P. dissotocum, P. elongatum, P. amasculinum, P. graminicola and P pulchrum are new records to this region. P. aphanidermatum is dominant. The other 7 species are P. spinosum, P. deliense, P. kunmingense, P. nanningense, P. acanthophoron, P ultimum and P. falciforme. In addition, the geographical distribution of these species in this region was also presented in this paper. It indicated that the species composition of the genus Pythium was different in different sampling sites.