Tripp M L, Paznokas J L
J Gen Microbiol. 1981 Nov;127(1):35-43. doi: 10.1099/00221287-127-1-35.
Asexual sporangiospores of Mucor racemosus produced on a minimal sporulation medium (M spores) germinated only if glucose, mannose or a complex substrate such as peptone, yeast extract or Casamino acids was present. Once germinated, growth was supported by a wide range of substrates including amino acids, carbohydrates or organic acids. Sporangiospores produced on a nutritionally complex sporulation medium (C-spores) germinated on a wide range of carbon sources. C-spore phenotype was pleiotropic in that sporangiospores capable of germinating on cellobiose could always germinate on glutamate or xylose; but C-spores capable of germinating on xylose or glutamate did not always germinate on cellobiose. There was a hierarchy of substrates capable of initiating germination with glucose = mannose greater than xylose greater than glutamate greater than cellobiose. C-spores also differed from M-spores by initiating germination in the presence of the non-metabolizable glucose analogue 3-O-methylglucose. These results suggest that at least two sporangiospore phenotypes are produced depending upon the concentration and type of ingredients present in the sporulation medium.
总状毛霉在基本产孢培养基上产生的无性孢子囊孢子（M孢子）只有在存在葡萄糖、甘露糖或诸如蛋白胨、酵母提取物或酪蛋白氨基酸等复合底物时才会萌发。一旦萌发，包括氨基酸、碳水化合物或有机酸在内的多种底物都能支持其生长。在营养复杂的产孢培养基上产生的孢子囊孢子（C孢子）能在多种碳源上萌发。C孢子表型具有多效性，即能够在纤维二糖上萌发的孢子囊孢子总能在谷氨酸盐或木糖上萌发；但能够在木糖或谷氨酸盐上萌发的C孢子并不总能在纤维二糖上萌发。能够引发萌发的底物存在一种等级关系，即葡萄糖 = 甘露糖 > 木糖 > 谷氨酸盐 > 纤维二糖。C孢子与M孢子的不同之处还在于，它能在不可代谢的葡萄糖类似物3 - O - 甲基葡萄糖存在的情况下开始萌发。这些结果表明，根据产孢培养基中成分的浓度和类型，至少会产生两种孢子囊孢子表型。
