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Evaluation of Heritability and Genetic Advance for Yield and Fiber Traits Among Cotton F2 Hybrids

تقدير درجة التوريث و التقدم الوراثي لصفات الغلة و الألياف ضمن أفراد الجيل الثاني الهجينة من القطن

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 Publication date 2003
and research's language is العربية
 Created by Shamra Editor




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This research has been carried out at the experimental Station of Agriculture Faculty, Damascus University during the period of 1998-2000. Five parents were selected from the Cotton Office Germplasm (Aleppo40, Raqua5, Dir22, Daltabain50, 88G6104) to examine the inheritance of some morphophysiological, yield, and quality related traits. In1998, the five parents were hand-crossed in all combinations (with no reciprocals) generating ten F1 hybrids. During 1999, the ten crosses and their parents were planted to produce F2 seeds. In 2000 the F1s, F2s, and their parents were grown in a randomized complete block design with two replications. Heritability estimates in broad sense showed that the earliness traits possess the highest values, followed by total and actual bolls number, indicating the importance of additive gene action in the inheritance of these traits. Whereas, heritability values for other traits were markedly different, revealing the genetic diversity of these hybrids parents. High estimates of expected genetic advance were found to be associated with high heritability estimates for total and actual bolls number, indicating that direct selection should be effective for these traits. On the other hand, improvement of traits, possessing intermediate estimates of genetic advance and high heritability estimates, such as total bolls number, harvest index, flowering earliness and fiber elongation in some studied hybrids, through direct selection might be less effective. The results suggest that traits with high heritability estimates associated with low estimates of genetic advance; and those possess intermediate estimates of heritability and genetic advance or low estimates of both parameters are most likely controlled by non-additive genes, therefor, direct selection might not be effective for improving these traits.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة تقدير درجة التوريث والتقدم الوراثي لصفات الغلة والألياف في الجيل الثاني من هجن القطن. تم تنفيذ البحث في مزرعة كلية الزراعة بجامعة دمشق خلال الفترة من 1998 إلى 2000 باستخدام خمسة آباء نقية تم اختيارها من البنك الوراثي لإدارة بحوث القطن. تم تهجين هذه الآباء للحصول على عشرة هجن، وزُرعت النباتات في تصميم القطاعات العشوائية الكاملة بمكررين. أظهرت النتائج أن صفات الباكورية وعدد الجوز الكلي والفعلي تمتعت بأعلى قيم درجة التوريث، مما يشير إلى تأثير الفعل التراكمي للمورثات. بينما كانت قيم درجة التوريث للصفات الأخرى متباينة، مما يعكس التنوع الوراثي بين الآباء. أظهرت النتائج أيضًا أن الانتخاب المباشر يمكن أن يكون فعالًا في تحسين الصفات ذات التوريث العالي والتقدم الوراثي العالي، بينما يكون أقل فعالية للصفات ذات التوريث المتوسط والتقدم الوراثي المتوسط. توصي الدراسة بمتابعة تقدير معامل التوريث العام والخاص في الأجيال الانتقالية المتقدمة وتكرار التجربة في بيئات مختلفة.
Critical review
تعد هذه الدراسة إضافة قيمة لفهم السلوك الوراثي لصفات الغلة والألياف في القطن، إلا أن هناك بعض النقاط التي يمكن تحسينها. أولاً، كان من الممكن توسيع نطاق الدراسة لتشمل مزيدًا من الصفات الوراثية والبيئية لتحليل أعمق. ثانيًا، كان من الممكن استخدام تقنيات تحليل إحصائي أكثر تقدمًا لتحسين دقة النتائج. ثالثًا، لم يتم التطرق بشكل كافٍ إلى تأثير العوامل البيئية على الصفات المدروسة، مما قد يؤثر على دقة التقديرات الوراثية. وأخيرًا، كان من الممكن تقديم توصيات أكثر تحديدًا للمربين بناءً على النتائج المستخلصة.
Questions related to the research
  1. ما هي الصفات التي أظهرت أعلى قيم درجة التوريث في الدراسة؟

    أظهرت صفات الباكورية وعدد الجوز الكلي والفعلي أعلى قيم درجة التوريث في الدراسة.

  2. ما هو تأثير الفعل التراكمي للمورثات على الصفات المدروسة؟

    يشير تأثير الفعل التراكمي للمورثات إلى أن الصفات ذات التوريث العالي تخضع لتأثير هذه المورثات، مما يجعل الانتخاب المباشر فعالًا في تحسينها.

  3. ما هي التوصيات التي قدمتها الدراسة للمربين؟

    توصي الدراسة بمتابعة تقدير معامل التوريث العام والخاص في الأجيال الانتقالية المتقدمة وتكرار التجربة في بيئات مختلفة لتحسين دقة التقديرات الوراثية.

  4. ما هي النقاط التي يمكن تحسينها في الدراسة؟

    يمكن تحسين الدراسة بتوسيع نطاقها لتشمل مزيدًا من الصفات الوراثية والبيئية، واستخدام تقنيات تحليل إحصائي أكثر تقدمًا، والتطرق بشكل كافٍ إلى تأثير العوامل البيئية على الصفات المدروسة، وتقديم توصيات أكثر تحديدًا للمربين.


References used
AL-ENANI, F. A., and Y. T. ATTA. 1986. Genetic analysis of some economic characters in cross in Egyptian cotton . Bulletin of Faculty of Agriculture, Cairo Univ. ,Egypt. 37(1): 309-319
ALI, B., I. A. KHAN. and K. AZIZ. 1998. Study pertaining to the estimation of variability, heritability and genetic advance in upland cotton. Pakistan .J. Biological Sciences, Pakistan. 1(4) : 307-308
AL-JIBOURI, H. A,J. O. RAWLINGS. And P. A. MILLER. 1958. Genotype by environment interaction in cotton. Crop Sci.9: 377- 381
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