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The activities of phosphofructokinase (PFK), fructose diphosphatase (FDP), nicotinamide adenine dinucleotide (NAD) and NAD phosphate (NADP)-linked isocitrate dehydrogenases (IDHNAD, IDHNADP), two NAD-linked glutamate dehydrogenases (GDH1, GDH2), and isocitrate lyase were studied during the development of the two phenotypes, ordinary colorless and resistant sporangia (OC and RS plants), of water mold Blastocladiella emersonii in synchronized liquid cultures. The OC plants had a generation time of about 12 h, whereas the RS plants required 3.5 days to reach maturity. All the enzymes were present throughout the development of both phenotypes. In zoospores, PFK, FDP, and GDH2 were localized in the cytosol. The IDHNADP activity was distributed with two-thirds in the soluble and one-third in the particulate fraction. GDH1 and IDHNAD showed the same distribution and were predominantly present in the particulate fraction, presumably in the mitochondria. Isocitrate lyase was found in the particulate fraction. The enzyme levels changed considerably during development. FDP and IDHNADP varied in a parallel manner. Similarly, the three enzymes PFK, IDHNAD and GDH1 showed parallel variations. The activity patterns for all enzymes were different for the OC and RS pathways. Isocitrate lyase exhibited the largest changes in activity during development. Thus, during OC plant formation, its activity decreased by a factor of 20. GDH2 varied similarly to PFK and IDHNADP during OC plant development, whereas it behaved like isocitrate lyase during RS plant development. The ratios between anabolic and catabolic enzymes were higher in mature plants than in zoospores and higher in RS plants than in OC plants. The results indicate that the variations in the enzyme levels are secondary to the critical changes involved in the transition from one developmental pathway to the other.

Variation in levels of enzymes related to energy metabolism in alternative developmental pathways of Blastocladiella emersonii