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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
DETECTION 0F NON ALLELICI INTERACTIONS VIA GENERATIONS MEAN ANALYSIS IN MAIZE
الكشف عن التداخلات غير الاليلية من خلال تحليل متوسط الأجيال في الذرة الصفراء.

Authors: K. M. Wuhiab كريمة محمد وهيب --- B. H. Hadi بنان حسن هادي
Journal: Iraqi Journal of Agricultural Science مجلة العلوم الزراعية العراقية ISSN: 00750530/24100862 Year: 2016 Volume: 47 Issue: 7 - special issue Pages: 44-55
Publisher: Baghdad University جامعة بغداد

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Abstract

This experiment was conducted at the field of Field Crop Dept. College of Agric / Univ.of Baghdad,to evaluate the genetic gene effects to some traits of maize. Six generations P1, P2, F1, F2, BC1 and BC2 for four crosses produced from crossing of genetically different six inbred lines. The six parameters were evaluated in randomized complete block design with four replications. The analysis of variance showed significant differences among generations. Means of F1′s were higher than the highest parent for all the traits of all crosses, indicated over dominance gene action. Hybrid vigor and heterosis were positive for most of traits for crosses. Result of scaling test for four criteria A , B, C, and D indicated significant effects of non-allelic interaction controlling genetic variation among six generations for seven traits. The mean effects were highly significant for all traits in all crosses indicated that all traits were quantitatively inherited, also indicated that lines had genetic diversity. Dominance effects were higher than mean and additive effects for all traits and all crosses, indicated the importance role of dominance component of gene action in inheritance traits. There were different type of epistasis interaction effects observed for various traits and crosses. Their values were varied for different trait and crosses. The dominance × dominance interactions were higher than other epistasis interaction effects.We can conclude that the traits in all crosses shown the complex behavior, hence the selection should be delayed after several generations of segregation until reached homoztgosity.

نفذت تجربة حقلية في حقل قسم علوم المحاصيل الحقلية –كلية الزراعة – جامعة بغداد، لتقدير التأثيرات الوراثية والتفوقية للجينات التي تحكم توريث بعض صفات الذرة الصفراء. تم التضريب بين ست سلالات مختلفة وراثيا لإنتاج ست أجيال هي P1 وP2 وF1 وF2 وBC1 وBC2 .تم تقدير هذه الثوابت باستخدام القطاعات الكاملة المعشاة بأربعة مكررات. أوضح تحليل التباين فروقا معنوية بين الأجيال الستة. كان متوسط الجيل الأول على من أعلى الأبوين لكل الصفات ولكل التضريبات، موضحا فعل التفوق للجين. كانت قوة الهجين والتهجن موجبة لأغلب الصفات للتضريبات المدروسة. أوضحت نتيجة اختبار scaling للمعايير الأربعةA وB وC و Dتأثيرات معنوية للتفاعل غير الاليلي الحاكم للتغايرات الوراثية بين الأجيال الستة وللصفات السبع. كان متوسط التأثيرات عالي المعنوية لكل الصفات ولكل التضريبات موضحا أن تلك الصفات كمية، وان السلالات المستخدمة متغايرة وراثيا. كانت تأثيرات السيادة أعلى من تأثيرات فعل الجين المضيف لكل الصفات ولكل التضريبات ، مبينة أهمية دور فعل الجين السيادي في توريث الصفات. تم ملاحظة أشكال مختلفة من التداخلات التفوقية للجينات لمختلف الصفات والتضريبات، وقد اختلفت قيمها بحسب الصفة والتضريب. كان شكل تأثير فعل الجين ا لتفوقي من نوع سيادي ×سيادي أعلى من بقية تأثيرات التفوقية ، لذا يمكن أن نستنتج أن سلوك الصفات في كل التضريبات كان معقدا لذا يحبذ تأخير الانتخاب إلى ما بعد عدة أجيال من الانعزال كي تصل الآباء إلى درجة عالية من التماثل الوراثي.

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