Subscribe Now Subscribe Today
Science Alert
 
Blue
   
Curve Top
Asian Journal of Agricultural Research
  Year: 2009 | Volume: 3 | Issue: 1 | Page No.: 1-10
DOI: 10.3923/ajar.2009.1.10
 
Facebook Twitter Digg Reddit Linkedin StumbleUpon E-mail

Effects of Low Nitrogen and Drought on Genetic Parameters of Grain Yield and Endosperm Hardness of Quality Protein Maize

Claver Ngaboyisonga, Kiarie Njoroge, Duncan Kirubi and Sam M. Githiri

Abstract:
The aim of this study was to assess how low nitrogen and drought stresses affect genetic parameters of grain yield and endosperm hardness of QPM. Twelve inbred lines were acquired from CIMMYT and used to generate 36 single cross hybrids with North Carolina Design II procedures. The single crosses were evaluated at Kiboko in Kenya and Rubona in Rwanda in 2005 and 2006 cropping seasons under optimum, low nitrogen and drought conditions. Observations were performed on grain yield and endosperm hardness. The results showed that gene action on the grain yield was predominantly non-additive and maternal, whereas that of the endosperm hardness was predominantly additive and maternal. Low nitrogen and drought changed the proportions of different genetic effects. They changed as well the magnitudes and direction of General Combining Abilities (GCAs) of lines and Specific Combining Abilities (SCAs) of crosses. It was possible to have together, significant and positive SCAs for grain yield and significant and negative SCAs for endosperm hardness. Crosses with significant and positive SCAs for grain yield and significant and negative SCAs for endosperm hardness are candidates to use in QPM production, especially in drought and low nitrogen prone areas.
PDF Fulltext XML References Citation Report Citation
 RELATED ARTICLES:
  •    Heterosis and Combining Ability in Maize using Diallel Crosses among Seven New Inbred Lines
  •    Compatibility Study of Indigenous Plant Growth Promoting Rhizobacteria with Inorganic and Organic Fertilizers used in Tea (Camellia sinensis)
  •    Estimation of Genetic Parameters in Three Maize Crosses for Yield and its Attributes
  •    Physiologic Responses of Haloxylon aphyllum to Consecutive Tensions of Dryness and Study of Their Role in Improving Resistance to Dryness of Vase Twigs
How to cite this article:

Claver Ngaboyisonga, Kiarie Njoroge, Duncan Kirubi and Sam M. Githiri, 2009. Effects of Low Nitrogen and Drought on Genetic Parameters of Grain Yield and Endosperm Hardness of Quality Protein Maize. Asian Journal of Agricultural Research, 3: 1-10.

DOI: 10.3923/ajar.2009.1.10

URL: https://scialert.net/abstract/?doi=ajar.2009.1.10

COMMENT ON THIS PAPER
 
 
 

 

 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 

Curve Bottom