Genotypic Correlations, Dominance, and Heritability of Quantitative Characters in Oats¹

Abstract

Three methods of estimating dominance were applied to F1 data on plant height, panicle number, heading date, number of spikelets per panicle, number of panicles per plant, and grain yield from the 15 diallel crosses among 6 oat varieties. Genotypic correlations and heritability percentages, in the broad sense, were calculated for the F2.In general, the dominance values from the 3 methods of estimation were in good agreement with one another and with the observed effects. Overdominance was indicated for number of panicles per plant in the F1 whereas estimates for yield ranged from partial to overdominance. Partial dominance was indicated for short panicles and plant height. Earliness of heading was partially dominant in both the F1 and F2 and few spikelets per panicle were partially dominant.The heritability percentages were 33, 53, 54, 61, 74, and 87 for number of panicles per plant, grain yield, panicle length, plant height, number of spikelets per panicle, and heading date, respectively. The genetic correlations between plant height, panicle length, number of spikelets, heading date, and grain yield were positive, and most of them were relatively high.The heritability percentages and high levels of dominance for yield and panicles per plant observed in the F1 indicate that selection for these attributes should be delayed until later generations. Selection for plant height, panicle length, number of spikelets and heading date should be feasible in early generations.

Caracterização agronômica de populações locais de azevém na Região Sul do Brasil

“…Nas gramíneas em geral, especialmente em cereais, o ciclo possui alta herdabilidade, conforme detectado em trigo (EHDAINE & WAINES, 1989), aveia (PETR & FREY, 1966;MITTELMANN et al, 2001) e cevada (FREY, 1954). Também para o azevém as herdabilidades realizadas geralmente são altas (NELSON et al, 1997).…”

Screening of Diploid Wild Potatoes Pollen Traits under Heat Stress

“…In this current investigation, a high heritability was observed for pollen viability. Previous research has consistently shown that high heritability implies minimal environmental influence on the genotype [59][60][61]. Therefore, minimized environmental effect on the studied trait allowed the high accuracy of 94% in the selection of genotypes under the HS conditions [40,[62][63][64].…”

Analisis rata-rata generasi jagung Unpad toleran naungan pada sistem agroforestri dengan albizia di Jawa Barat

“…Menurut Syukur et al (2009) kriteria nilai heritabilitas adalah rendah = h 2 bs < 0.2; sedang = 0.2 < h 2 bs < 0.5; dan tinggi = h 2 bs > 0.5, untuk kriteria antara heritabilitas arti sempit dan heritabilitas arti luas adalah sama (Reddy & Jabeen, 2016). Pendugaan rasio dominansi dihitung berdasarkan rumus pendugaan potensi rasio (hp) yang disarankan oleh Laurentin & Karlovsky (2006); Petr & Frey (1966) yaitu hp= (F 1 -MP)/(HP-MP), dimana F 1 adalah rata-rata F 1 , HP adalah rata-rata tetua tahan, dan MP adalah nilai tengah kedua tetua. Berdasarkan nilai potensi rasio, derajat dominansi diklasifikasikan sebagai: hp = 0 (tidak ada dominansi); hp = 1 atau hp = -1 (dominan atau resesif penuh); 0 < hp < 1 (dominan parsial; -1 < hp < 0 (resesif parsial); dan hp > 1 atau hp < -1 (overdominansi).…”