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DNA syntheses in course of meiotic development in Neurospora crassa*†

Published online by Cambridge University Press:  14 April 2009

G. A. S. Iyengar ,
P. C. Deka ,
S. C. Kundu  and
S. K. Sen
G. A. S. Iyengar
Affiliation:
Botany Department, Bose Institute, Calcutta 700009, India
P. C. Deka
Affiliation:
Botany Department, Bose Institute, Calcutta 700009, India
S. C. Kundu
Affiliation:
Botany Department, Bose Institute, Calcutta 700009, India
S. K. Sen
Affiliation:
Botany Department, Bose Institute, Calcutta 700009, India

Summary

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Nuclear DNA syntheses have been measured microspectrophotometrically in course of meiotic nuclear development in Neurospora crassa. The purpose of the study has been to establish the timing of these DNA syntheses in relation to meiosis and in the formation of its final products in an ideal genetic material, where the products of the meiotic division can be recovered and identified. Spectrophotometric analysis has indicated that the last premeiotic DNA replication is completed before caryogamy; a postmeiotic DNA replication takes place at the tetrad of the nuclei level; and finally a second postmeiotic DNA replication occurs in the ascospores to result in eight binucleated ascospores. The timing of postmeiotic replication is compatible with the models explaining gene conversion through the postulated mechanisms involving heteroduplex formation.

Type
Research Article
Information
Genetics Research , Volume 29 , Issue 1 , February 1977 , pp. 1 - 8
Copyright
Copyright © Cambridge University Press 1977

References

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