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Register a new userThe phenotypic correlation and path analysis coefficient for grain yield and its components in four local maize (Zea mays L.) genotypes
دراسة الارتباط المظهري و تحليل المسار لصفة الغلة الحبية و مكوناتها في طرز محلية من الذرة الصفراء(.Zea mays L)
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أجري البحث في قسم بحوث الذرة في دمشق، و مركز البحوث العلمية الزراعية في دير الزور ، التابعين للهيئة العامة للبحوث العلمية الزراعية، سورية، خلال الموسمين الزراعيين 2008 و 2009 بهدف دراسة معاملي الارتباط المظهري و تحليل المسار لصفات الغلة الحبية و مكوناتها.
The present investigation was undertaken to estimate phenotypic correlation and path coefficient analysis for grain yield and its components in maize. Four local genotypes of yellow maize were evaluated in 2008 and 2009 growing seasons at two locations i.e.
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Research summary
تناولت الدراسة تحليل معامل الارتباط المظهري وتحليل المسار لصفة الغلة الحبية ومكوناتها في أربعة طرز محلية من الذرة الصفراء في موقعين مختلفين في سوريا (دمشق ودير الزور) خلال موسمي 2008 و2009. تم تقييم تأثير ثلاثة مستويات من السماد الأزوتي (130، 195، 260 كغ N/هكتار) على الغلة الحبية ومكوناتها. أظهرت النتائج أن الغلة الحبية في موقع دمشق ارتبطت بشكل معنوي وموجب مع طول العرنوس وارتفاعه وعدد الصفوف بالعرنوس، بينما في موقع دير الزور ارتبطت الغلة الحبية بشكل معنوي وموجب مع كل الصفات المدروسة. أظهرت نتائج تحليل المسار أن طول العرنوس وارتفاعه وعدد الصفوف بالعرنوس كانت أكثر الصفات مساهمة في تباين الغلة الحبية في موقع دمشق، بينما كانت صفات ارتفاع العرنوس وعدد الحبوب بالصف ووزن 100 حبة أكثر الصفات مساهمة في تباين الغلة الحبية في موقع دير الزور. تم استنتاج أن موقع دير الزور يشكل بيئة مناسبة للانتخاب وتحسين غلة محصول الذرة الصفراء تحت مستوى التسميد الأزوتي الثاني (195 كغ N/هكتار).
Critical review
دراسة نقدية: تعتبر الدراسة شاملة ومهمة لفهم تأثير السماد الأزوتي على الغلة الحبية ومكوناتها في الذرة الصفراء. ومع ذلك، يمكن توجيه بعض الملاحظات النقدية لتحسين الدراسة. أولاً، كان من الممكن توسيع نطاق الدراسة لتشمل مواقع بيئية أخرى في سوريا لتقديم صورة أكثر شمولية عن تأثير السماد الأزوتي. ثانياً، لم يتم التطرق بشكل كافٍ إلى التأثيرات البيئية الأخرى مثل الري والكثافة النباتية والتي قد تؤثر على النتائج. ثالثاً، كان من الممكن استخدام تقنيات تحليلية أكثر تطوراً لتحليل البيانات مثل تحليل الانحدار المتعدد أو استخدام نماذج الخطية المختلطة. أخيراً، كان من المفيد تقديم توصيات عملية للمزارعين بناءً على النتائج لتحسين إنتاجية الذرة الصفراء في سوريا.
Questions related to the research
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ما هي المواقع التي أجريت فيها الدراسة؟
أجريت الدراسة في موقعين مختلفين في سوريا هما دمشق ودير الزور.
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ما هي مستويات السماد الأزوتي المستخدمة في الدراسة؟
تم استخدام ثلاثة مستويات من السماد الأزوتي وهي 130، 195، و260 كغ N/هكتار.
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ما هي الصفات التي ارتبطت بشكل معنوي مع الغلة الحبية في موقع دمشق؟
في موقع دمشق، ارتبطت الغلة الحبية بشكل معنوي مع طول العرنوس وارتفاعه وعدد الصفوف بالعرنوس.
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ما هي الصفات التي كانت أكثر مساهمة في تباين الغلة الحبية في موقع دير الزور؟
في موقع دير الزور، كانت صفات ارتفاع العرنوس وعدد الحبوب بالصف ووزن 100 حبة أكثر الصفات مساهمة في تباين الغلة الحبية.
References used
AL-Ahmad, A. S. 2004. Genetic parameters for yield and its components in some new yellow maize crosses. Ph.D. Thesis, Fac. of Agric., Ain Shams Univ., Egypt
Amin, Amal Z, H. A. Khalil and R. K. Hassan. 2003. Correlation studies and relative importance of some plant characters and grain yield in maize single crosses. Arab Univ. J. Agric. Sci. Ain Shams Univ. Cairo 11(1):181 – 190
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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The present investigation was undertaken to estimate phenotypic
correlation and path coefficient analysis for grain yield and its components in
maize. Four local genotypes of yellow maize were evaluated in 2008 and 2009
growing seasons at two loca
tions i.e. Damascus and Dir Al-Zor under three
nitrogen fertilization levels (130, 195 and 260 of N. ha-1), The nitrogen fertilizer
was applied at two splits. Split split plot design was used with 4 replications.
Results of phenotypic correlation values showed that grain yield at Damascus
location was positively and significantly associated with ear height (r= 0.204**),
ear length (r= 0.205**) and number of rows per ear (r= 0.228**). On the other
hand, grain yield at Dir Al-Zor location was positively and significantly
associated with all studied traits at combined data whereas, it was positively
and significantly associated with ear length at three levels and combined data
(0.305*, 0.410**, 0.347** and 0.375**, respectively). The data of path coefficient
analysis showed that ear length, ear height and number of rows per ear had
positive direct effects on grain yield variation and thus grain yield
improvement can be achieved through selection for ear length and ear height at
Damascus location (11.06%). On the other side, data showed that each of ear
height, number of kernels per row and 100-kernel weight had positive direct
effects on grain yield variation (32.98%) and thus, 100-kernel weight can be
considered as selection criteria may lead to the improvement of grain yield in
yellow maize at Dir Al-Zor location.
The present investigation was undertaken to estimate phenotypic
correlation and path coefficient analysis for grain yield and its components in
maize. Four local genotypes of yellow maize were evaluated in 2008 and 2009
growing seasons at two loca
tions i.e. Damascus and Dir Al-Zor under three
nitrogen fertilization levels (130, 195 and 260 of N. ha-1), The nitrogen fertilizer
was applied at two splits. Split split plot design was used with 4 replications.
Results of phenotypic correlation values showed that grain yield at Damascus
location was positively and significantly associated with ear height (r= 0.204**),
ear length (r= 0.205**) and number of rows per ear (r= 0.228**). On the other
hand, grain yield at Dir Al-Zor location was positively and significantly
associated with all studied traits at combined data whereas, it was positively
and significantly associated with ear length at three levels and combined data
(0.305*, 0.410**, 0.347** and 0.375**, respectively). The data of path coefficient
analysis showed that ear length, ear height and number of rows per ear had
positive direct effects on grain yield variation and thus grain yield
improvement can be achieved through selection for ear length and ear height at
Damascus location (11.06%). On the other side, data showed that each of ear
height, number of kernels per row and 100-kernel weight had positive direct
effects on grain yield variation (32.98%) and thus, 100-kernel weight can be
considered as selection criteria may lead to the improvement of grain yield in
yellow maize at Dir Al-Zor location.
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.
This study was carried out at the Scientific Agriculture Research Center, Al-Ghab,
Syria, during 2013 –2014 growing seasons to estimate heterosis, combining ability,
phenotypic correlation and path analysis for 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 for eighteen hybrids produced by the line × tester method, the major findings were:
inbred lines, testers, hybrids and combining ability mean squares were significant for all
traits, indicating that additive and non-additive gene actions were the important in
inheritance of all traits. The ratios of σ2
GCA/σ2
SCA showed that non-additive gene action was
more important in controlling all traits except of number of kernel per row. Heterosis
percentage for all traits were significant compared with the check variety except of ear
height trait. GCA effects showed that the lines P1 and P7 were good combiners for grain
yield per plant, also, SCA effects showed that P2×P8, P5×P8, P4×P9 and P1×P7 crosses were
the best F1 combiners for grain yield per plant. Results of phenotypic correlation and path
analysis values showed that ear length, ear diameter and number of kernel per row were
positively and significantly associated with grain yield per plant, also, these traits can be
considered as selection criteria may lead to the improvement of grain yield in maize.
This study was conducted at the farm of Faculty of Agricultural –Kharabo
as an intensive crop during 201 and 2012 growing seasons. Using the
Randomized Complete Block Design (RCBD) with two replications to study
some genetic indices for grain yiel
d and its components, of 79 families of the
Sh group of maize improved by Full-sib selection. The results indicated that
the broad sense heritability ranged from high to moderate for some yield
components (number of kernels per row, number of rows per ear, ear length,
ear diameter, the weight of whole ear, whole kernel weight and grain yield and
it was 49.6, 52.9, 46.3 79.7, 56.74, 51 and 85.2%) respectively. Additive gene
action appeared to be controlling number of kernel per row, number of rows
per ear, ear length, ear diameter،,grain yiel, the weight of whole ea, kernel
weight indicating less selection cycles are required to improve yield depending
on its components.
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