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[Induction of cytomixis affects microsporogenesis in Sesamum indicum L. (Pedaliaceae)]

G Kumar, R S Iadav

    Ontogenez
    |October 6, 2012
    PubMed

    Insights

    Cytomixis, a meiotic abnormality in sesame, increased with Sodium azide doses. This phenomenon impacts pollen viability and grain size.

    Area of Science:

    • Plant genetics
    • Cytology
    • Reproductive biology

    Context:

    • Microsporogenesis is crucial for plant reproduction.
    • Sesame (Sesamum indicum L.) is an important oilseed crop.
    • Sodium azide (SA) is a chemical mutagen used in plant breeding.

    Purpose:

    • To investigate the occurrence and impact of cytomixis during meiosis in sesame.
    • To determine the effect of Sodium azide (SA) on cytomixis and chromosomal abnormalities.

    Summary:

    • Cytomixis was observed in sesame microsporogenesis, particularly in Sodium azide (SA) treated populations.
    • The phenomenon involved cytoplasmic channels or direct fusion of pollen mother cells (PMCs), with nuclear content migration.
    • Increased SA doses correlated with higher rates of cytomixis and chromosomal abnormalities, including stickiness, laggards, and micronuclei.

    Impact:

    • Cytomixis negatively affected meiotic behavior in sesame.
    • Observed consequences include reduced pollen viability and the formation of heterogeneous pollen grain sizes.
    • This study provides insights into the cytological effects of mutagens on crop meiosis.

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