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GENETIC ARCHITECTURE AND DETERMINATION THE NUMBER OF DOMINANT AND RECESSIVE GENES OF WHEAT GRAIN YIELD AND IT'S COMPONENTS (Triticum aestivum L.).

Authors: Jasim M.Al-juboory --- Dawood S.Madab Al-Obaidy --- Ahmed H.Al-juboory
Journal: Diyala Journal of Agricultural Sciences مجلة ديالى للعلوم الزراعية ISSN: 20739524 Year: 2016 Volume: 8 Issue: 2 Pages: 13-27
Publisher: Diyala University جامعة ديالى

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Abstract

Six bread wheat lines and their half diallel crosses were grown by using Randomized Complete Block Design with three replications for estimating genetic parameters and the nature of gene action according to Hayman approach (1954) through graphical analysis by dividing the distance between two points of intercepted regression line and parabola curve into four parts and then estimating the amount of dominant and recessive genes exactly for each parent. The results showed that genotypes differed significantly among themselves, other than significant additive variance components were in flag leaf area,No.spikes.plant-1,spike length, and 1000grain weight, while dominance significant in flag leaf area and No.grains.spike-1,though dominance variance (H1) more important than (H2). Positive F values in No.spikes.plant-1,spike length and 1000grains weight indicated of dominant genes than recessive which that confirm by high ratio of average degree of dominance (a‾) (more than 1 in all studied traits that means existence of over dominance, also high ratio of KD/KR refers to abundance of dominant genes more than recessive one in parents of No.spikes. plant-1, spike length, No.grains. spike-1 and 1000grain weight. Heritability in narrow sense were in flag leaf area (0.291), 1000grain weight (0.425) , 1000 grain weight(0.425) and low in no.grains.spike-1 and grain yield.plant-1.Parent (6) exhibited best performance in plant hieght,flag leaf area, and no.spikes.plant-1, also higher in no.grains.spike-1 and superior in grain yield.plant-1 and possessing large amount of dominant genes controlling these traits


Article
السلوك الوراثي والمظهري في الصفات الكمية لبعض أصناف من الحنطة (Triticum aestivum L.) وهجنها التبادلية النصفية

Authors: Ahmed H. Anees احمد هواس عبد الله أنيس --- Abdul-Khader H. AL- Jubouri عبد القادر حميدي جاسم الجبوري
Journal: Rafidain journal of science مجلة علوم الرافدين ISSN: 16089391 Year: 2018 Volume: 27 Issue: 5A-Botany Pages: 76-87
Publisher: Mosul University جامعة الموصل

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Abstract

A field experiment was carried out at the research station of the field crops departmentcollege of agricultureuniversity of Tikrit during (2011-2012 and 2013 winter seasons, includedcrossing according half diallel cross in the first season and evaluating parents and their crosses inthe second season to study the genotypic and phenotypic behavior for the traits: days to anthesis,plant height (cm), no. spikes. plant-1, no. grains. spike-1, 1000 grains weight (g) and individual grainweight. Results showed highly significant differences for whole studied traits, many parents havehigh significant means and agood combiner in many traits especially ACS-W-J19-9148 parents inplant height and grains. spike-1 , ACS-W-J14-9143 parent in days to anthesis and 1000 grain weightand ACS-W-J15-9144 in no.grains.spike-1 and individual grain weight. Many crosses have betterperformance and affected positively to wards desired direction of significant hybrid vigor (ACS-WJ19-9148 X sham 6) in no. grains. spike-1 and individual grain yield, (ACS-W-J15-9144) in 1000grain weight and individual grain weight. Whole traits were controlled by dominance type of geneaction and that adequate with the ratio of the degree of dominance which were more than one.Consequently heritability in narrow sense and expected genetic advance were low. The last twocrosses can be useful through the application of pedigree selection on the late segregationgenerations to improve bread wheat cultivars

نفذ البحث في حقول قسم المحاصيل الحقلية في كلية الزراعة في جامعة تكريت خلال الموسمين ( 20112013 ) كان الأول لغرض إجراء التهجين التبادلي النصفي والآخر لتقييم الآباء مع هجنها باستخدام ستة تراكيب - و 2012Acs-w- 4) و )Acs-w-J14 - 3) و 9143 ) Acs-w-J6- 2) و 9126 ) Acs-w-J19- 1) و 9148 ) Acs-w-J12 - وراثية ( 91456)) بهدف دراسة السلوك الوراثي والمظهري لصفات عدد الأيام لطرد السنابل وارتفاع النبات وعدد ) 5) وشام 6 )J15-9144سنابل النبات وعدد حبوب السنبلة ووزن 1000 حبة وحاصل النبات الفردي. وأظهرت النتائج فرقًا معنويًا عند مستوى احتمال%1 لجميع الصفات المدروسة، وتميزت الآباء بأعلى المتوسطات الحسابية وبتفوق معنوي إضافة الى تأثيرات المقدرة العامةلطرد السنابل ووزن Acs-w-J14 - لارتفاع النبات وعدد حبوب السنبلة والأب 9143 Acs-w-J19- في الاتحاد كالأب 9148لعدد حبوب السنبلة وحاصل النبات الفردي، وكذلك تفوق الهجن معنويًا في أدائها Acs-w-J15- 1000 حبة والأب 9144( شام 6 X Acs-w-J19- وتأثيراتها بالاتجاه المرغوب وحصولها على قوة هجين ذو دلالة إحصائية ومرغوبة كالهجين ( 9148شام 6) لوزن 1000 حبة وحاصل النبات الفردي. X Acs-w-J15- لعدد حبوب السنبلة وحاصل النبات الفردي والهجين ( 9144وان جميع الصفات كان يحكمها الفعل الجيني السيادي ومتوافقة ذلك مع معدل درجة السيادة التي كانت أكبر من واحد بينماانخفض التوريث بالمعنى الضيق والتحسين الوراثي المتوقع. وبالتالي يمكن الاستفادة من هذين الهجينين من خلال الانتخاب فيالأجيال المتأخرة لغرض تطوير أصناف هجينة عالية الإنتاج مستقب ً لا

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