EVALUATION OF STABILITY PARAMETERS FOR DISCRIMINATION OF ADAPTABLE, STABLE AND HIGH YIELDING MAIZE HYBRIDS | ||||
| Egyptian Journal of Plant Breeding | ||||
| Volume 27, Issue 1, January 2023, Page 111-125 PDF (649.9 K) | ||||
| Document Type: Original research | ||||
| DOI: 10.12816/ejpb.2023.301675 | ||||
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| Abstract | ||||
| The Main focus of the plant breeders now is to develop new hybrids with high and stable yield in both favorable and unfavorable growing conditions. Three yellow promising maize hybrids and two commercial hybrids were evaluated in trial (D) in season 2022 at eleven locations. Trial-D was the last stage evaluation of new maize hybrids registration for grain yield in Egypt. A randomized complete block design with six replications was used. A separate analysis for each location, a combined analysis across locations, parametric and nonparametric statistics and rank correlation among them were performed for grain yield. Mean squares due to hybrids (H) at each location and combined across locations were highly significant, also the mean squares due to locations (L) and hybrids× locations interaction (HLI) were highly significant for grain yield. The proportion of the total variation was 90.42% for (L), 2.54% for (H) and 7.04% for (HLI). The highest hybrids for grain yield were SC-Sk139 at Kafr El-Sheikh, Giza, Beni-Sueif, Minia, Assuit and Sohag, SC-Sk147 at Behera, Dakahlia, Menufyia and Sharkia and SC168 at Gharbia. These hybrids can be used specifically for these regions. The results combined across locations exhibited that the two promising hybrids SC-Sk139 and SC-Sk147 were significantly superior for grain yield relative to the two checks, also these two hybrids were the highest for grain yield under favorable and unfavorable environments in addition SC-Sk147 was the most stable hybrid based on (S2, CV%, bi, S2diو R2, δ2, Wi2 and Pi) stability parameters and SC-Sk139 was stable based on R2, Pi and Si(1). So this study recommended these two hybrids to be released as new commercial hybrids in Egypt. The correlation coefficient was significant and positive between (mean grain yield with Si(2)), (S2 with CV%), (S2 with bi), (CV% with bi), (S2di with δ2), (S2di with Wi2) and (δ2 with Wi2). Meanwhile the correlation coefficient was significant and negative between (mean grain yield with Pi), (S2di with R2), (δ2 with R2) and (R2 with Wi2). | ||||
| Keywords | ||||
| Zea mays; Multi-location trials; favorable and unfavorable environments; adaptability and correlation coefficient | ||||
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