PHYSIOLOGICAL EXPLORATION OF CERTAIN MAIZE INBRED LINES AND HYBRIDS BY USING RAPID METHODS TECHNIQUE 1. GENOTYPIC DIFFERENCES
El-Koomy, M., Abdel-Gawad, A., Abo-Shetaia, A., Mahgoub, G. (2005). PHYSIOLOGICAL EXPLORATION OF CERTAIN MAIZE INBRED LINES AND HYBRIDS BY USING RAPID METHODS TECHNIQUE 1. GENOTYPIC DIFFERENCES. EKB Journal Management System, 13(2), 297-307. doi: 10.21608/ajs.2005.15458
M B.A El-Koomy; A A Abdel-Gawad; A. M.A Abo-Shetaia; G .M.A Mahgoub. "PHYSIOLOGICAL EXPLORATION OF CERTAIN MAIZE INBRED LINES AND HYBRIDS BY USING RAPID METHODS TECHNIQUE 1. GENOTYPIC DIFFERENCES". EKB Journal Management System, 13, 2, 2005, 297-307. doi: 10.21608/ajs.2005.15458
El-Koomy, M., Abdel-Gawad, A., Abo-Shetaia, A., Mahgoub, G. (2005). 'PHYSIOLOGICAL EXPLORATION OF CERTAIN MAIZE INBRED LINES AND HYBRIDS BY USING RAPID METHODS TECHNIQUE 1. GENOTYPIC DIFFERENCES', EKB Journal Management System, 13(2), pp. 297-307. doi: 10.21608/ajs.2005.15458
El-Koomy, M., Abdel-Gawad, A., Abo-Shetaia, A., Mahgoub, G. PHYSIOLOGICAL EXPLORATION OF CERTAIN MAIZE INBRED LINES AND HYBRIDS BY USING RAPID METHODS TECHNIQUE 1. GENOTYPIC DIFFERENCES. EKB Journal Management System, 2005; 13(2): 297-307. doi: 10.21608/ajs.2005.15458

PHYSIOLOGICAL EXPLORATION OF CERTAIN MAIZE INBRED LINES AND HYBRIDS BY USING RAPID METHODS TECHNIQUE 1. GENOTYPIC DIFFERENCES

Arab Universities Journal of Agricultural Sciences
Article 9, Volume 13, Issue 2, September 2005, Page 297-307  XML PDF (501.82 K)
Document Type: Original Article
DOI: 10.21608/ajs.2005.15458
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Authors
M B.A El-Koomy* 1; A A Abdel-Gawad2; A. M.A Abo-Shetaia2; G .M.A Mahgoub1
1Maize Res. Section, Field Crops Inst., ARC, Giza, Egypt
2Agron. Dept., Fac. Agric., Ain Shams Univ, Shobra El-Khema, Cairo, Egypt
Abstract
Identification of specific physiological differences among maize genotypes (six inbred lines, four single crosses and four three-way crosses) to drought would be useful to plant breeders for improving selection criteria. Two field experiments were conducted in optimum and stress moisture conditions at Gemmeiza Agricultural Re-search Station in 2001 and 2003 growing seasons. The treatments were 14 geno-types, (six inbreds and eight hybrids), which were separately established under three irrigation treatments in split plot design with four replications. The genotypes were compared under water-deficit conditions on the basis of certain rapid techniques to determine leaf area index (LAI), photosynthetic efficiency (photo), canopy tempera-ture depression (CTD), stomatal conductance (SC) and chlorophyll (CHL) content which were deleteriously affected by water stress in the sensitive genotypes. Results revealed that values of LAI, photosynthetic efficiency, canopy temperature depres-sion, stomatal conductance and chlorophyll content of maize hybrids surpassed those of inbred lines. This was true at 30, 45 and 60 days after planting (DAP). Dif-ferences among maize hybrids and among inbred lines were significant at different growth stages for the same studied traits, except of the LAI for the inbreds, at 30 DAP and CTD for the hybrids at 30 as well as 60 DAP. Detecting certain physio-logical criteria, i.e. LAI, photosynthetic efficiency (photo), canopy temperature de-pression (CTD), stomatal conductance (SC) and chlorophyll content (Chl) could be used as reliable techniques to explore the physiological activity of maize genotypes at early stages of growth and may be recommended in screening different genotypes in maize breeding programs.
Keywords
Maize; Inbred Lines; Hybrids; Leaf area index (LAI); Photosynthetic (Photo) efficiency; Canopy temperature depression (CTD); Stomatal conductance (SC); Chlorophyll (Chl) content
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