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Genetical studies on drought tolerance in maize / Ebrahim Hassan Mohamed Hafez ; Supervised Ahmed Medhat Mohamed Alnaggar , Abdalla Mohamed Ali , Ahmed Mohamed Abdelhamid Gohar

By: Contributor(s): Material type: TextTextLanguage: English Publication details: Cairo : Ebrahim Hassan Mohamed Hafez , 2016Description: 121 P. : charts ; 25cmOther title:
  • دراسات وراثية لتحمل الجفاف فى الذرة الشامية [Added title page title]
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  • Issued also as CD
Dissertation note: Thesis (M.Sc.) - Cairo University - Faculty of Agriculture - Department of Agronomy Summary: Two hundred fifty four test-cross hybrids of maize (Zea mays L.) were produced in 2011 season between 254 doubled haploid (DH) lines developed via the in vivo (inducer) technique and an inbred line tester. A field experiment was conducted in 2012 season to screen 256 genotypes; namely 254 top crosses and two check cultivars) for drought tolerance at flowering (WSF) and grain filling (WSG). The objectives were to identify tolerant maize DH lines x tester crosses under WSF and/or WSG, (ii) to describe the effects of WSF and WSG on different traits of maize and (iii) to study the response of heritability and genetic advance from selection to the two types of drought. A split plot design in lattice arrangement (16x16) was used; main plots were allotted to three irrigation regimes (well-watering; WW, water stress at flowering; WSF, and water stress at grain filling; WSG) and sub-plots to 256 genotypes. In general, WSF and WSG caused a significant reduction of 38.92 and 39.47% in grain yield/plant (GYPP), 39.09 and 41.19% in grain yield/fed (GYPF), 21.79 and 20.93% in number of ears/plant (EPP), 11.11 and 7.78% in plant height (PH), 5.88 and 8.82% in ear height (EH), respectively, but caused a significant increase in anthesis-silking interval (ASI), barren stalks (BS), leaf rolling (LR), days to anthesis (DTA) and days to silking (DTS). The best top crosses in drought tolerance, mean performance and breeding value under WSF and WSG were identified, so their corresponding DH lines were recommended for further exploitation in the breeding program aiming at developing drought tolerant maize hybrids
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Item type Current library Home library Call number Copy number Status Date due Barcode
Thesis Thesis قاعة الرسائل الجامعية - الدور الاول المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.07.01.M.Sc.2016.Eb.G (Browse shelf(Opens below)) Not for loan 01010110073487000
CD - Rom CD - Rom مخـــزن الرســائل الجـــامعية - البدروم المكتبة المركزبة الجديدة - جامعة القاهرة Cai01.07.01.M.Sc.2016.Eb.G (Browse shelf(Opens below)) 73487.CD Not for loan 01020110073487000

Thesis (M.Sc.) - Cairo University - Faculty of Agriculture - Department of Agronomy

Two hundred fifty four test-cross hybrids of maize (Zea mays L.) were produced in 2011 season between 254 doubled haploid (DH) lines developed via the in vivo (inducer) technique and an inbred line tester. A field experiment was conducted in 2012 season to screen 256 genotypes; namely 254 top crosses and two check cultivars) for drought tolerance at flowering (WSF) and grain filling (WSG). The objectives were to identify tolerant maize DH lines x tester crosses under WSF and/or WSG, (ii) to describe the effects of WSF and WSG on different traits of maize and (iii) to study the response of heritability and genetic advance from selection to the two types of drought. A split plot design in lattice arrangement (16x16) was used; main plots were allotted to three irrigation regimes (well-watering; WW, water stress at flowering; WSF, and water stress at grain filling; WSG) and sub-plots to 256 genotypes. In general, WSF and WSG caused a significant reduction of 38.92 and 39.47% in grain yield/plant (GYPP), 39.09 and 41.19% in grain yield/fed (GYPF), 21.79 and 20.93% in number of ears/plant (EPP), 11.11 and 7.78% in plant height (PH), 5.88 and 8.82% in ear height (EH), respectively, but caused a significant increase in anthesis-silking interval (ASI), barren stalks (BS), leaf rolling (LR), days to anthesis (DTA) and days to silking (DTS). The best top crosses in drought tolerance, mean performance and breeding value under WSF and WSG were identified, so their corresponding DH lines were recommended for further exploitation in the breeding program aiming at developing drought tolerant maize hybrids

Issued also as CD

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