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Related Experiment Videos

Breeding cassava for apomixis.

Nagib M A Nassar1, Rosane G Collevatti

  • 1Departamento de Genética e Morfologia, Universidade de Brasília, Brasília, DF, Brasil. nagnassa@rudah.com.br

Genetics and Molecular Research : GMR
|February 14, 2006
PubMed
Summary
This summary is machine-generated.

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Apomixis genes were transferred to cassava from a wild relative, M. glaziovii. This study reports nearly 100% apomixis in the resulting hybrids, indicating its role in Manihot speciation.

Area of Science:

  • Plant genetics
  • Reproductive biology
  • Agronomy

Background:

  • Apomixis, asexual reproduction through seeds, is a desirable trait for crop improvement.
  • Cassava (Manihot esculenta) is a vital staple crop, but its sexual reproduction limits breeding efficiency.
  • Wild Manihot relatives offer potential genetic resources for improving cassava.

Purpose of the Study:

  • To investigate the successful transfer and expression of apomixis genes in cassava.
  • To assess the level of apomixis in interspecific hybrids between cassava and M. glaziovii.
  • To explore the role of apomixis in the speciation of the Manihot genus.

Main Methods:

  • Interspecific hybridization between cassava (Manihot esculenta) and M. glaziovii.
  • Open pollination of the hybrid for three subsequent generations.

Related Experiment Videos

  • Genotyping of the fourth-generation sibs and maternal progenitor using five cassava microsatellite loci.

    • Main Results:

    • All seven sibs in the fourth generation were genetically identical to each other and to their maternal progenitor.
    • Siblings derived from M. glaziovii also showed complete identity at the tested microsatellite loci.
    • This provides strong evidence for the occurrence of apomixis in wild cassava relatives.

    Conclusions:

    • Apomixis has been successfully induced and expressed in cassava through hybridization with M. glaziovii.
    • The findings suggest apomixis plays a significant role in Manihot speciation.
    • This research reports the first instance of nearly 100% apomixis in this genus, offering a breakthrough for cassava breeding.