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#apomixis

2 public questions tagged with this topic.

Plant Breeding 2

Apomixis helps in:

Practical benefit of apomixis lies in fixation of heterosis. Once elite heterozygous hybrid created showing superior yield due to complementation of dominant alleles and epistatic networks, sexual reproduction breaks genotype via segregation. Apomictic seed formation clones maternal genome including heterozygous allelic configuration, thus hybrid vigor maintained generation after generation through seed, eliminating need for annual recreation of hybrid from parental inbreds using costly emasculation and isolation. Economic advantage immense for smallholders lacking access to hybrid seed market

Ref: Koltunow Am J Bot apomixis heterosis fixation; Underwood et al Nature Clonal MiMe; Wang et al Nature Biotech synthetic apomixis rice.

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Plant Breeding 2

Apomixis refers to:

Apomixis signifies alternative reproductive pathway where seeds form without meiosis and syngamy, producing offspring clonal to maternal parent preserving heterozygosity and hybrid genotype. Developmental routes include apospory where embryo sac initiates from somatic nucellar cell bypassing megaspore mother cell differentiation, diplospory where megaspore mother cell undergoes mitosis instead of meiosis forming unreduced embryo sac, and adventitious embryony where embryo develops directly from nucellar tissue. Unreduced egg cell then develops parthenogenetically via activation of egg cell tra

Ref: Bicknell & Koltunow Annu Rev Plant Biol apomixis mechanisms; Carman et al Apomixis genetics; NCERT Biology Apomixis introduction.

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