Genetic Analysis of Yield and Its Components in Some Bread Wheat Crosses (Triticum aestivum L.) using Five Parameters Model. | ||||
| Journal of Plant Production | ||||
| Article 19, Volume 8, Issue 11, November 2017, Page 1215-1220 PDF (233.55 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2017.41292 | ||||
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| Author | ||||
| E. I. Zaazaa | ||||
| Agronomy Dept., Fac. of Agric., Al-Azhar Univ., Cairo, Egypt. | ||||
| Abstract | ||||
| The present investigation was done at the Experimental Farm of Agronomy Department – Faculty of Agriculture Al-Azhar University, Nasr City, Cairo, Egypt during four successive seasons from 2012/2013 to 2015/2016. Four bread wheat varieties (parents) Misr1, Gemmeiza 9, Gemmeiza 10 and Gemmeiza 11 were chosen to form three bread wheat crosses; Misr 1× Gemmeiza 10, Gemmeiza 9× Gemmeiza 11 and Gemmeiza10×Gemmeiza 11. Five parameters model was used for measuring some important genetic parameters for yield and its component characters. These characters were number of spikes / plant, spike length (cm), grain weight/spike (gm), number of grains / spike, 100- grain weight (gm), grain yield / plant (gm) and harvest index %.Randomized complete block design (RCBD) with three replicates was used in the final experiment. Five populations (P1, P2, F1, F2 and F3) for each cross were used in this investigation. Results revealed that, the F1 population recorded the highest mean values compared with other populations for all characters in the three crosses except grain weight/spike in the third cross .The data also showed that, standard error estimates in F2 were larger than other populations. All studied traits in this investigation were controlled by both additive and non-additive genetic effects, but the values of dominance × dominance epistatic gene effects were greater than the other effects for most traits. Estimates of heterosis relative to mid-parent were positive and significant for number of spikes / plant, spike length, number of grains / spike and grain yield per plant in all crosses under study, while, the estimates of heterosis relative to better parent were positive and significant for number of spikes /plant and grain yield / plant in all crosses. Inbreeding depression percentage from F1 to F2 and F3 were positive and significant for most studied characters. potence ratio revealed over dominance for most studied traits. Heritability in broad sense found to be moderate to high in most traits in three crosses, these estimates ranged from 0.56 for spike length in the second cross to 0 .84 for 100- grain weight in cross 2, while the values of narrow sense heritability were low to moderate for all studied characters in the three crosses, these values were between 0.01 for number of spikes/plant in the second cross and 0.56 for number of grains/spike in the first cross. | ||||
| Keywords | ||||
| gene effects; Heterosis; Inbreeding depression (ID); potence ratio; heritability; Wheat | ||||
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