Life Cycle of Saccharomyces PROFESSOR SANJAY KUMAR DATTA GOVT

COMPILED AND CIRCULATED BY PROFESSOR SANJAY KUMAR DATTA, GOVT. APPROVED PART TIME TEACHER, DEPARTMENT OF BOTANY, NARAJOLE RAJ COLLEGE

Life Cycle of Saccharomyces PROFESSOR SANJAY KUMAR DATTA GOVT. APPROVED PART TIME TEACHER DEPT. OF BOTANY NARAJOLE RAJ COLLEGE

Kingdom : Fungi Division: Mycota Sub-division: Ascomycotina Class : Hemiascomycetes Order: Endomycetales Family : Saccharomycetaceae Genus : Saccharomyces

BOTANY: SEM-II, PAPER – C3T: MYCOLOGY AND PHYTOPATHOLOGY, UNIT-3: ASCOMYCOTA. COMPILED AND CIRCULATED BY PROFESSOR SANJAY KUMAR DATTA, GOVT. APPROVED PART TIME TEACHER, DEPARTMENT OF BOTANY, NARAJOLE RAJ COLLEGE Introduction • Eukaryotic • Unicellular (some may seen multi cellular due to formation of psuedohyphae) • 3-4 µm in diameter, 5-30m in length • Chemoorganotrophs, aerobic • Grow mainly in neutral and slightly acidic conditions. • Oval or round shape • Yeast grow typically in moist environment where there is plentiful supply of simple, soluble nutrients such as sugar and amino acids • Commonly found on leaf and fruit surfaces, on roots and in various types of foods.

BOTANY: SEM-II, PAPER – C3T: MYCOLOGY AND PHYTOPATHOLOGY, UNIT-3: ASCOMYCOTA. COMPILED AND CIRCULATED BY PROFESSOR SANJAY KUMAR DATTA, GOVT. APPROVED PART TIME TEACHER, DEPARTMENT OF BOTANY, NARAJOLE RAJ COLLEGE Structure of Vegetative Body The thalloid plant body is unicellular, but during rapid multiplication by budding the cells may remain attached in chain forming pseudo-mycelium. The cells may be globose, elliptical, oval to even rectangular in shape and measure about 5-6 x 6-8µm. Electron microscopic studies and chemical analysis of Saccharomyces cerevisiae show that the cells are surrounded by a distinct cell wall with three layers. The outmost layer mainly consist of protein-mannan and some chitin; the middle layer mainly of glucan and the inner most layer consists of protein glucan.

BOTANY: SEM-II, PAPER – C3T: MYCOLOGY AND PHYTOPATHOLOGY, UNIT-3: ASCOMYCOTA. COMPILED AND CIRCULATED BY PROFESSOR SANJAY KUMAR DATTA, GOVT. APPROVED PART TIME TEACHER, DEPARTMENT OF BOTANY, NARAJOLE RAJ COLLEGE Budding in Saccharomyces • Sometimes due to repeated budding yeast cell appears in one or more chains and called pseudomycelium.

• 3 Types of life cycle of Sexual reproduction: 1) Haplobiontic life cycle 2) Diplobiontic life cycle 3) Haplo-Diplobiontic life cycle

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BOTANY: SEM-II, PAPER – C3T: MYCOLOGY AND PHYTOPATHOLOGY, UNIT-3: ASCOMYCOTA.