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Induced Cytomictic Diversity in Maize (Zea mays L.) Inbred

机译：玉米自交系诱导的细胞多样性

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摘要

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.
机译：突变育种已用于改善寡聚和多基因特性，抗病性和包括产量能力在内的定量特性。鉴于玉米自交系在遗传学和植物育种研究中的广泛应用，其细胞学稳定性是重要的考虑因素。在Zea mays L.中的研究证实，染色体的迁移是一个真实的事件，不能将其视为固定或机械损伤产生的伪影。在目前的调查中，我们发现在玉米的六个自交系中。 CM-135，CM-136，CM-137，CM-138，CM-142和CM-213在各种剂量的伽马射线照射下。在200 Gy，200 Gy和600 Gy的情况下，自交系CM-138的一些植物在减数分裂的所有阶段均表现出特征性的细胞质连接。发现该处理组中的四株植物发生罕见现象，称为“ Cytomixis”。阐明在玉米的近交系中，通过γ射线处理诱导的细胞混合可被认为是产生非整倍体和多倍体配子的可能来源。这种现象可能会在玉米的多样性和有增产潜力的意义上在玉米中有多种应用。

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  • 来源
    《Cytology and genetics》 |2010年第6期|p.334-338|共5页
  • 作者

    Prashant Kumar Rai; Girjesh Kumar; Avinash Tripathi;

  • 作者单位

    Plant Genetics Laboratory, Department of Botany, University of Allahabad, India;

    Plant Genetics Laboratory, Department of Botany, University of Allahabad, India;

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

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