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Induced cytomictic diversity in maize (Zea mays L.) inbred

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Abstract

Mutation breeding has been used for improving oligogenic and polygenic characters, disease resistance and quantitative characters including yielding ability. The cytological stability of maize inbred lines is an important consideration in view of their extensive use in genetics and plant breeding research. Investigation in Zea mays L. confirms that the migration of chromosomes is a real event that cannot be misunderstood as an artifact produced by fixation or mechanical injuries. During present investigation, we found that out of six inbred lines of Zea mays L. viz. CM-135, CM-136, CM-137, CM-138, CM-142 and CM-213 at various treatment doses of gamma irradiations viz. 200, 400 and 600 Gy, some of the plants of inbred line CM-138 at 200 Gy dose displayed characteristic cytoplasmic connections during all the stages of meiosis. Four plants from this treatment set were found to be engaged in a rare phenomenon reported as “Cytomixis”. It elucidates that in inbred of Zea mays L., induced cytomixis through gamma rays treatment may be considered to be a possible source of production of aneuploid and polyploid gametes. This phenomenon may have several applications in Zea mays L. improvement in the sense of diversity and ever yield potential.

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Authors and Affiliations

  1. Plant Genetics Laboratory, Department of Botany, University of Allahabad, Allahabad, India

    Prashant Kumar Rai & Girjesh Kumar

  2. H.N.B. Government Post Graduate College, Allahabad, 211008, India

    Avinash Tripathi

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  1. Prashant Kumar Rai
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  2. Girjesh Kumar
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  3. Avinash Tripathi
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Correspondence to Prashant Kumar Rai.

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Rai, P.K., Kumar, G. & Tripathi, A. Induced cytomictic diversity in maize (Zea mays L.) inbred. Cytol. Genet. 44, 334–338 (2010). https://doi.org/10.3103/S0095452710060022

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  • DOI: https://doi.org/10.3103/S0095452710060022

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