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Chloroplast DNA inheritance in Populus.

O P Rajora1, B P Dancik

  • 1Department of Forest Science, University of Alberta, T6G 2H1, Edmonton, Alberta, Canada.

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Summary
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Chloroplast DNA inheritance in Populus hybrids shows maternal inheritance. All F1 offspring exclusively inherited chloroplast DNA from their maternal parent, confirming uniparental inheritance in these poplar species.

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Area of Science:

  • Plant Genetics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Chloroplast DNA (cpDNA) plays a crucial role in photosynthesis and is maternally inherited in most angiosperms.
  • Understanding cpDNA inheritance patterns in Populus species is vital for breeding programs and evolutionary studies.
  • Previous research suggests maternal inheritance in Populus, but further confirmation across different crosses is needed.

Purpose of the Study:

  • To investigate the mode of chloroplast DNA inheritance in F1 hybrid progenies of Populus deltoides intraspecific and interspecific crosses.
  • To determine if chloroplast DNA is uniparentally inherited from the maternal parent in Populus deltoides × P. nigra and P. deltoides × P. maximowiczii hybrids.
  • To confirm maternal inheritance of chloroplast DNA in intraspecific Populus deltoides hybrids.

Main Methods:

  • Restriction fragment analysis of chloroplast DNA (cpDNA) was performed on parental and F1 hybrid progenies.
  • Southern blot hybridization using heterologous cpDNA probes from Petunia hybrida was employed.
  • Multiple restriction enzymes and cpDNA probes were used to identify polymorphisms between parent species.

Main Results:

  • Significant cpDNA restriction fragment polymorphisms were identified between Populus deltoides and P. nigra (26 polymorphisms) and between P. deltoides and P. maximowiczii (12 polymorphisms).
  • In all interspecific crosses (P. deltoides × P. nigra and P. deltoides × P. maximowiczii), F1 offspring exclusively possessed cpDNA fragments from the maternal P. deltoides parent.
  • Intraspecific P. deltoides hybrids also exhibited cpDNA restriction fragments identical to their maternal parent.

Conclusions:

  • The study provides clear evidence for uniparental-maternal inheritance of the chloroplast genome in interspecific hybrids of Populus deltoides with P. nigra and P. maximowiczii.
  • Maternal inheritance of chloroplast DNA was also confirmed in intraspecific Populus deltoides hybrids.
  • These findings align with the predominant pattern of maternal chloroplast DNA inheritance observed in most angiosperm species.