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Cytogenetics of a factor for syncyte formation and male sterility in Pennisetum americanum

M K Rao1, P R Koduru

  • 1Department of Botany, Andhra University, Waltair, India.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|December 7, 2013
PubMed

Insights

Male sterility in pearl millet is inherited as a recessive trait. The ms2 gene causes pollen abortion and disrupts meiosis by forming plasmodial tapetum and pollen mother cells.

Area of Science:

  • Plant Genetics
  • Reproductive Biology
  • Agronomy

Background:

  • Male sterility is crucial for hybrid seed production in crops like pearl millet (Pennisetum americanum).
  • Understanding the genetic basis of male sterility aids in breeding programs.
  • Inbred line IP 482 exhibits a specific form of male sterility.

Purpose of the Study:

  • To investigate the inheritance pattern of male sterility in Pennisetum americanum inbred line IP 482.
  • To identify the genetic factors responsible for pollen abortion and associated meiotic abnormalities.

Main Methods:

  • Segregation analysis to determine the inheritance mode.
  • Cytological observation of meiotic development in sterile and fertile plants.
  • Microscopic examination of pollen mother cells (PMCs) and tapetum.

Main Results:

  • Male sterility in IP 482 is controlled by a single recessive gene, designated ms2.
  • Homozygosity for ms2 leads to pollen abortion, plasmodial tapetum, and plasmodial PMCs.
  • Meiosis is characterized by delayed, asynchronous development, desynapsis, and blockage.

Conclusions:

  • The ms2 gene plays a critical role in regulating tapetal development and meiotic progression in Pennisetum americanum.
  • Plasmodial tapetum formation results from PMC fusion during pachytene.
  • This genetic factor provides insights into male sterility mechanisms in pearl millet.

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