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Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
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Maternal plastid inheritance: two abating factors identified.

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Maternal inheritance of organelle DNA (orgDNA) in plant plastids is not fully understood. Chung et al. found that cold temperatures and pollen DNA levels influence maternal inheritance in tobacco plastids.

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Area of Science:

  • Plant biology
  • Genetics
  • Molecular biology

Background:

  • Organelle DNAs (orgDNAs) in mitochondria and plastids are typically maternally inherited.
  • The precise mechanisms controlling this maternal inheritance, especially in seed plant plastids, remain largely unknown.

Purpose of the Study:

  • To investigate the factors influencing maternal inheritance of plastid DNA in tobacco plants.
  • To identify specific environmental and genetic factors that regulate plastid DNA transmission.

Main Methods:

  • Experimental manipulation of temperature conditions during pollination.
  • Quantification of plastid DNA content in pollen.

Main Results:

  • Cold temperature exposure significantly impacts the maternal inheritance of plastid DNA.
  • The amount of DNA present in the pollen also plays a crucial role in determining inheritance patterns.

Conclusions:

  • Both environmental (cold temperature) and genetic (pollen DNA amount) factors are key regulators of maternal plastid DNA inheritance in tobacco.
  • These findings provide insights into the complex control mechanisms governing organelle DNA transmission in plants.