The Germination of Sporangiospores of Rhizopus arrhizus; Spore Swelling and Germ-Tube Emergence

Ultrastructural details in germinating sporangiospores of Rhizopus stolonifer and Rhizopus arrhizus.

Electron microscope examination of sporangiospore sections from Rhizopus stolonifer (Ehrenb. ex Fr.) Lind. and R. arrhizus Fischer revealed details on intracellular organization not previously reported. Aldehyde fixation followed by chromeosmium postfixation permitted clear depiction of ribosomes hitherto unrevealed in these cells. Mitochondria were diversiform. Spore wall structures in the two...

Physiological and morphological correlation of Rhizopus stolonifer spore germination.

Sporangiospores of Rhizopus stolonifer were examined at various stages of germination by scanning electron and phase-contrast microscopy. These observations were correlated with changes in spore dry weight, spore volume, respiration, and syntheses of ribonucleic acid, deoxyribonucleic acid, and protein during germination.

Physiological and Morphological Correlation of Rhizopus stolonifer Spore Germination

Changes in esters of fatty acids of Rhizopus arrhizus during germination and growth.

Natural esters of fatty acids of Rhizopus arrhizus Fischer increased during the first 48 hr of growth. During the 48- to 72-hr period, there was a shift in concentration from the methyl esters to the ethyl esters of fatty acids.

Differential expression of desaturases and changes in fatty acid composition during sporangiospore germination and development in Mucor rouxii.

Polyunsaturated fatty acids (PUFAs), namely, oleic (C18:1), linoleic (C18:2), and gamma-linolenic acid (C18:3), constituted the majority in the total fatty acid content (44%) of sporangiospores of Mucor rouxii. At 30 degrees C, the germination begins within 1h at which time spore swelling occurs, followed by germ tube emergence within 3-4h. Throughout germination, an increase in gamma-linolenic...