Criterion for the selection of high yielding maize (Zea mays) genotypes
Murtza, N. (PMAS Arid Agriculture Univ., Rawalpindi (Pakistan). Dept. of Plant Breeding and Genetics) | Shabbir, G. (PMAS Arid Agriculture Univ., Rawalpindi (Pakistan). Dept. of Plant Breeding and Genetics) | Mahmood, T. (PMAS Arid Agriculture Univ., Rawalpindi (Pakistan). Dept. of Plant Breeding and Genetics) | Ansar, M. (PMAS Arid Agriculture Univ., Rawalpindi (Pakistan). Dept. of Agronomy) | Tabassum, M.I. (Sugarcane Research Inst., AARI, Faisalabad (Pakistan)) | Ilyas, M.
The study was conducted at NARC, Islamabad, Pakistan during the year 2009 to estimate heritability and genetic advances regarding yield and yield contributing traits using fourteen maize (Zea mays) genotypes (BS-01, Agati 2002, Margalla, EV-1097, EV-1098, Sadaf, EV-6098, EV-5098, EV-7004Q, Soan-3, Islamabad Gold, Islamabad White, Raka Poshi and Sahiwal-2002). The experiment was laid out in RCBD with three replications. Data were recorded for plant height, ear height, ear length, leaf area, number of leaves per plant, 100-grain weight and grain yield per plant. Analysis of variance revealed highly significant mean sum of squares for all the characters studied. The highest heritability estimates were observed for 100-grain weight (97.39%). All the other traits were observed to have heritability estimates ranging from 97.39 (100 grain weight) to 47.06% (number of leaves/plant). Range of genetic advance for different traits ranged from 1.26 (ear length) to 2674.45 (grain yield). The highest genetic advance was recorded for grain yield. Maximum level of phenotypic coefficient of variation was found for grain yield per ha (19.52%) but it was minimum (8.07) for plant height among all the studied traits. Genotypic coefficient of variation for different traits ranged from 6.11 (ear length) to 18.83 (grain yield). All the other traits had their value of genotypic coefficient of variation in this range. Hence, it is recommended that selection may be based on genotypes possessing potential traits like plant height, ear height, leaf area, and grain yield for yield enhancement.
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