Early Generation Testing in Soybeans¹

Comparison between the SPD and the SPDS methods for segregating generation advancement in soybean

“…In our work, the higher number of correlations among these traits and grain yield were significant (Table 2). Positive and significant correlations among these characters also were found for different authors (Weatherspoon and Went, 1934;Weiss et al, 1947;Johnson et al, 1955;Anand and Torrie, 1963;Kwon and Torrie, 1964;Harrison et al, 1981). Soybean is one of the cultivated species which is most sensitive to photoperiod.…”

Heritability, variance, and selection studies in an oat population

“…heritability. This method has been used in several studies with self-fertilized crop species (Weiss, Weber, and Kalton, 1947;Piuzat and Atkins, 1953;Jones and Prey, 1950;Prey, Robertson, Cook and Down, 1952;Romero, I969 To improve the expression of heritability calculated by regression Frey and Horner (1957) suggested the standard unit method. With the conventional regression method, the celling of heritability percentage changes with each set of data, and until the ceiling is known, it is difficult to interpret whether a heritability value is high, medium or low.…”

Avaliação de progênies f2:4 e f4:6 de soja e perspectivas do uso de teste precoce para a produção de grãos

“…Em espécies autógamas, alguns estudos relatam resultados favoráveis com o teste precoce (MAHMUD e KRAMER, 1951;FREY 1954;NTARE e AKEN'OVA, 1985;SHARMA, 1994;SAINT-MARTIN e GERALDI, 2002), enquanto outros não (WEISS et al, 1947;BRIGGS e SHEBESKI, 1971;KNOTT e KUMAR, 1975;SEITZER e EVANS, 1978;JONES e SMITH, 2006). Este conflito de resultados pode ser explicado por diversas razões, entre elas, por se tratar de espécies e populações diferentes e, portanto, com distintos graus de variabilidade genética.…”