Sexual Reproduction And the Organization of the Nucleus in Certain Mildews No. 37
Sexual Reproduction And the Organization of the Nucleus in Certain Mildews No. 37
Robert Almer Harper
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The cells of Spirogyra do not complete the interrupted division and thus reestablish the nucleo-cytoplasmic equilibrium, but grow larger, not by pathological hypertrophy leading to death, but in a normal fashion which permits of their indefinite further division and growth. The ascus shows exactly the same physiological reaction to its increased nuclear content. It immediately grows to a far greater mass than that of any of the other cells of the ascocarp or mycelium. The evidence is thus very ...strong that the doubling of the nuclear mass in the young ascus is merely a preliminary to that growth of the ascus which is neces- sary for its functioning as a spore-sac. The whole process is thus placed in the category of nucleo-cytoplasmic regulations which are concerned with maintaining an equilibrium between the factors of assimilation and division in the cell. It is doubtless true that nucleo-cytoplasmic equilibrium is achieved many times by an increased number of nuclei in the cell without their fusion, especially in the algae and fungi.
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