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Regression analysis for general adaptation in pearl millet using different environmental indices.

D S Virk1, N B Singh, M Srivastava

  • 1Department of Plant Breeding, Punjab Agricultural University, Ludhiana, India.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|November 22, 2013
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Summary

This study analyzed pearl millet (Pennisetum typhoides) varieties for grain yield stability across Indian sites. Deviations mean squares (Sdi²) proved crucial for selecting stable varieties, with specific hybrids and composites showing general adaptability.

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Area of Science:

  • Agricultural Science
  • Plant Breeding
  • Genetics

Background:

  • Pearl millet (Pennisetum typhoides) is a vital grain crop in India.
  • Assessing genotype x environment interactions is crucial for identifying stable crop varieties.
  • Previous studies highlight the importance of stability analysis in crop improvement.

Purpose of the Study:

  • To evaluate the relative stability of pearl millet varieties.
  • To compare different measures of environmental values in regression analysis.
  • To identify pearl millet hybrids and composites with general adaptability.

Main Methods:

  • Regression analyses were performed on grain yield data from 20 hybrid and 13 composite pearl millet varieties.
  • Data were collected from 19 diverse trial sites across India.
  • Genotype x environment interactions were analyzed, focusing on non-linear components and deviations mean squares (Sdi²).

Main Results:

  • A significant portion of genotype x environment interactions was attributed to the non-linear component.
  • Deviations mean squares (Sdi²) were identified as a key parameter for selecting stable pearl millet varieties.
  • Mean grain yield showed a positive association with regression coefficients and deviations mean squares.
  • Specific hybrids (MH 31, MH 35, MH 36, MH 62) and composites (MP 16, MP 31, MP 36) demonstrated general adaptability.
  • The choice of environmental value measures had minimal impact on the overall interpretation of regression analysis.

Conclusions:

  • Deviations mean squares (Sdi²) are critical for identifying stable pearl millet varieties with general adaptability.
  • Regression analysis provides a robust framework for understanding genotype x environment interactions in pearl millet.
  • Selected hybrids and composite populations offer promising options for stable grain yield in diverse Indian environments.