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Register a new userEvaluation of some inbred lines of yellow maize (Zea mays L.) using top-cross method under different environments
تقييم بعض السلالات المرباة داخلياً من الذرة الصفراء باستخدام طريقة التهجين القمي في بيئات مختلفة
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Damascus University ورقة بحثية
Publication date
2013
fields
Field Crops
and research's language is
العربية
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Shamra Editor
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أجري هذا البحث بهدف تقييم القدرة على الائتلاف لستٍ و أربعين سلالة مرباة داخلياً من الذرة الصفراء و تقدير معاملي الارتباط المظهري و تحليل المسار لبعض الصفات الفينولوجية المورفولوجية و الغلة الحبية من خلال التهجين القمي بين هذه السلالات و الصنف غوطة-82 في منطقة الأغوار الأردنية (محطة دير علا) خلال شهر آذار من عام 2008.
Forty-six inbred lines of yellow maize (zea mays L) crossed apically with Al Ghouta variety No. 82 during 2008 growing season at Dir Ala, Dead Sea.
References used
Alabd Alhadi, R., M. Hadid and S. Al-Ahmad. 2010. Inheritance of Some Yield and Quality Traits of Maize (Zea mays L.) Using Half Diallel Cross. . M.Sc. Thesis, Fac. of Agric., Damascus Univ., Syria
Allard, R. W. 1960. Principles of plant breeding. John Wiley and sons, Inc., New York, U.S.A. 485p
Asrar-ur-Rehman, S., U. Saleem and G. M. Subhani. 2007. Correlation and path coefficient analysis in maize (Zea mays L.). J. Agric. Res., 45(3):177- 183
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This research was carried out to evaluate the combining ability of twentyfive
inbred lines of yellow maize and estimate the phenotypic correlation and
path analysis of twenty-five top crosses were formed during 2009 growing
season at Dir Ala, Dead
Sea. Jordan. Their plants were evaluated in Syria
during 2009 growing season in three locations (Al Raka, Aleppo and Dir Al-
Zor).
The research was conducted at the Maize Researches Department, General
Commission for Scientific Agriculture Researches (G.C.S.A.R.) Damascus,
Syria during the summer growing seasons of 2010, 2011 and 2012. Treatments
were arranged in a Randomized
Complete Blocks Design with three
replications. The research aimed to evaluate genetic parameters for some traits
like days to 50% silking, plant and ear height, ear length, ear diameter, number
of rows per ear, number of kernels per row, 100 kernel weight and grain yield
per plant using generations means analysis of two maize hybrids (IL.292-06 ×
IL.565-06, IL.459-06 × IL.362-06) to detect epistasis and estimates of mean
effect [m], additive [d], dominance [h], additive × additive [i], additive ×
dominance [j] and dominance × dominance [l] parameters. Results showed that
the additive - dominance model was adequate to demonstrate the genetic
variation and its importance in the inheritance of most studied traits. Nonallelic
gene interaction was operating in the control of genetic variation in most
studied traits. The signs of [h] and [l] were opposite in most studied traits for
the two crosses. Also, the inheritance of all studied traits was controlled by
additive and non-additive genetic effects, but dominance gene effects play the
major role in controlling the genetic variation of the most studied traits,
suggesting that the improvement of those characters need intensive selection
through later generations. The phenotypic variations were greater than
genotypic variations for all studied traits in the two crosses, indicating greater
influence of environment in the expression of these traits. Highly significant
heterosis relative to mid and better parents, respectively was found for all
characters, and this accompanied with inbreeding depression for all traits.
Narrow sense heritability and genetic advance were low in most of the traits
due to the dominance of non-additive gene action in controlling the genetic
variation of the most studied traits and this predict low to medium values of
genetic advance through selection process.
This study was carried out during 2010-2011 growing seasons at the
Maize Researches Department (G.C.S.A.R.) Damascus. To estimate
heterosis for number of rows per ear, ear length, ear diameter, 100- kernel
weight, and grain yield.
Six population seeds of three yellow maize hybrids were formed at Agricultural Research Center, Homs, during 2008 and 2009 growing seasons. Their plants were evaluated in 2010. The present work aims to determine the genetic parameters in six populati
ons (P1, P2, F1, F2, BC1, and BC2). Mean square results showed significant differences among mean values for all traits in all crosses. Significant heterosis values were positive and relative comparing to mid and better parent for most traits. The potence ratios exceeded (+1) in all traits and crosses except ear height, indicating thus over-dominance. In breeding, depression values were significant in most traits for Cross-1, while their values were non- significant in all traits for Cross-2 except plant height, and also in Cross-3 except plant height and grain yield per plant. In most traits epestasis or dominance gene action occupied the first rank in the genetic effects in order of importance to cross, with the exception of number of rows per ear, number of kernels per row and grain yield per plant where additive gene action occupied the first rank for Cross-2 and Cross-1 respectively. Therefore, it could be suggested that selection for most studied traits in the subsequent generations will be relatively more effective than in the early generations.
This study was carried out in the farm of the Faculty of Agriculture
University of Damascus during the growing season 2014, to study the
productivity of the maize cultivar ("Gouta 82) and the hybrids (Basel
1 and Basel 2) under the influence of tw
o plant densities 17.53
thousand plant. ha-1 (70x20cm) and 53.11 thousand plant. ha-1
(70x40cm).
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