Induction of segmental interchanges in pearl millet (Pennisetum typhoides)

Lal, J. and Srinivasachar, D. (1979) Induction of segmental interchanges in pearl millet (Pennisetum typhoides). Theoretical and Applied Genetics, 54 (1). pp. 27-32.

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Dry grains of Tift 23B and BIL3B were treated with gamma rays, diethyl sulphate and ethyleneimine at their approximate LD50 dosages and the M1 PMCs were examined at diacinesis for multivalent configurations resulting from segmental interchanges. Only gamma irradiation gave hexavalents, and ring quadrivalents were commoner from this treatment than from any other; quadrivalents, trivalents and ring quadrivalents were commonly found after all treatments. BIL3B was more responsive than Tift 23B to all the mutagens used. Evidence was found for some kind of chromosome specificity among the mutagens when causing breakages; quadrivalents formed were of a different type for each mutagen. Self-pollinated grains of two heterozygotes whose interchanges were induced by ethyleneimine and gamma rays were gamma irradiated a second time, after which interchange stocks involving up to eight chromosomes were found. From the results, alternate use of ethyleneimine and gamma rays appears to offer better possibilities of obtaining interchange heterozygotes involving more, if not all, chromosomes in a ring than two successive treatments with gamma rays alone

Item Type: Article
Author Affiliation: Division of Genetics, IARI, New Delhi, India
Subjects: Crop Improvement
Divisions: Millet
Depositing User: Ms K Syamalamba
Date Deposited: 04 May 2012 06:24
Last Modified: 04 May 2012 06:24
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