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EARLY TEST OF MAIZE (Zea mays L.) S3 LINES BY TOPCROSSING | ||
| IRAQ JOURNAL OF AGRICULTURE | ||
| Article 1, Volume 19, Issue 7, 2014, Pages 0-0 | ||
| Authors | ||
| J. N. Mahmoud; D. P. Yousif; M. A. Al- Safar; A. S. Hekmat | ||
| Abstract | ||
| A field experiment was conducted during fall season 2000 to test 108 topcrosses represents cooperation with the International maize and wheat Improvement Center (CIMMYT). Top crosses compared with four varieties as check, two represents local and two (CIMMYT) hybrids. The objective of this study was to screen and select germplasm that had good performance of GCA and continuing breeding program to develop new inbred lines suitable for hybrid seed production and to extend the genetic bas for corn crop throughout utilizing the geographic distance. A randomized Complete Block Design with two replications was used. Results showed that 14 topcrosses selected gave significant differences for all traits under investigation. Top cross 7 and 99 produced the lowest days to tasseling (55.500days). Where’s, top cross 7 produced the lowest days for silking (56.66 day). Top cross 37 produced the highest plant height (206.00cm), while top cross 40gaves lowest average of ear height (68.750cm). Top cross 40 and 50 gives highest average of ear/ plant (1.500). Top cross 67 gives highest average of kernel number (708.750), and highest grain/plant (281.450), whereas top cross 16 exceeded in 300gm kernels weight. Results may emphasize the inbred lines 67 gave the highest grain yield and kernel weight and more kernel number and ear/ plant. Grain yield characters were highly correlated with its components. The study emphasis that top crosses 67, 50, 51, 87, 103 and 13 gave good performances in yield and other characters and continuing inbreeding for advanced generations so as to introduce it in hybrid seed program whereas other inbred may utilized as genetic resources. | ||
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