Improvement of the new synthetic maize cultivar, Sakha-6, via three cycles of modified ear to row selection [electronic resource].

By: Contributor(s): Language: English Summary language: Arabic Description: P. 1657-1664Other title:
  • تحسين الصنف المركيبى الجديد سخا-6 باستخدام ثلاث دورات من الانتخاب بطريقة الكوز للخط المعدلة [Added title page title]
Uniform titles:
  • Mansoura University journal of agricultural sciences, 2004 v. 29 (4) [electronic resource].
Subject(s): Online resources: In: Mansoura Unviersity Journal of Agricultural Sciences 2004.v.29(4)Summary: The synthetic Sakha-6,which is a new white maize cultivar, was used to utilize its genetic variability to improve yielding potentiality through out three cycles C-0, C-1 and C-2 of modified ear-to row ,METR ,selection method .The research was made ,during 2001,2002 and 2003 growing seasons at Sakha Research Station under two nitrogen levels. The mean values for all traits, except silking date were higher at the high nitrogen level of 120 Kg N/Fad than the low nitrogen level of 70 Kg N/Fad in the three cycles of selection. Over the two nitrogen levels, the mean of cycle-2 was higher than cycle-0 for grain yield, ear length and ear diameter, while it was the reverse for silking date, plant and ear heights. These results indicated that the modified ear-to-row selection method were effective for increasing grain yield and yield components and in decreasing silking date and plant and ear heights. Genetic variance was significant at the two nitrogen levels and their combined for all traits in most three cycles of METR selection methods. The interactions between genetic variance and nitrogen levels were not significant for all traits in the three cycles. Moreover, the phenotypic and genotypic variances, over the two nitrogen levels, were low at C-2 than C-0 for all traits except phenotypic variance for silking date. Broad sense hertiability H2b% values were higher under the high nitrogen level than the low nitrogen level for all traits at the three cycles. However, the heritability estimates, over the two nitrogen levels , decreased from C-0 to C2 in METR selection method for all traits. H2b% for grain yield was 75.5%, 48.3% and 18.9% at C-0,C-1 and C-2, respectively. This indicated that genetic variability was decreased with the advances of cycles of selection. The expected gain from selection was higher under high nitrogen level than low nitrogen level for silking date, plant height and grain yield in two out of the three cycles. The expected genetic advance from selection ?G% for all traits were low at C-2 than C-0 over the two nitrogen levels, ?G% for grain yield were 13.9%, 10.01% and 3.14% at C-0,C-1 and C-2, respectively. Moreover, the highest values for expected gain from selection at the two nitrogen levels and when combined were obtained for grain yield compared with other traits in each cycle.
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The synthetic Sakha-6,which is a new white maize cultivar, was used to utilize its genetic variability to improve yielding potentiality through out three cycles C-0, C-1 and C-2 of modified ear-to row ,METR ,selection method .The research was made ,during 2001,2002 and 2003 growing seasons at Sakha Research Station under two nitrogen levels. The mean values for all traits, except silking date were higher at the high nitrogen level of 120 Kg N/Fad than the low nitrogen level of 70 Kg N/Fad in the three cycles of selection. Over the two nitrogen levels, the mean of cycle-2 was higher than cycle-0 for grain yield, ear length and ear diameter, while it was the reverse for silking date, plant and ear heights. These results indicated that the modified ear-to-row selection method were effective for increasing grain yield and yield components and in decreasing silking date and plant and ear heights. Genetic variance was significant at the two nitrogen levels and their combined for all traits in most three cycles of METR selection methods. The interactions between genetic variance and nitrogen levels were not significant for all traits in the three cycles. Moreover, the phenotypic and genotypic variances, over the two nitrogen levels, were low at C-2 than C-0 for all traits except phenotypic variance for silking date. Broad sense hertiability H2b% values were higher under the high nitrogen level than the low nitrogen level for all traits at the three cycles. However, the heritability estimates, over the two nitrogen levels , decreased from C-0 to C2 in METR selection method for all traits. H2b% for grain yield was 75.5%, 48.3% and 18.9% at C-0,C-1 and C-2, respectively. This indicated that genetic variability was decreased with the advances of cycles of selection. The expected gain from selection was higher under high nitrogen level than low nitrogen level for silking date, plant height and grain yield in two out of the three cycles. The expected genetic advance from selection ?G% for all traits were low at C-2 than C-0 over the two nitrogen levels, ?G% for grain yield were 13.9%, 10.01% and 3.14% at C-0,C-1 and C-2, respectively. Moreover, the highest values for expected gain from selection at the two nitrogen levels and when combined were obtained for grain yield compared with other traits in each cycle.

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