Developmental periods in soybean: photoperiod-sensitive X insensitive crosses evaluated at diverse latitudes.
1991
De Cianzio S.R. | Green D.E. | Chang C.S. | Shibles R.M.
Selection for long duration of seed-filling period (SFP) in segregating soybean [Glycine max (L.) Merr.] populations may be a way to increase seed yield. The objective of the study was to assess the relative effectiveness of selecting for SFP from tropical environments to develop lines for temperate locations in crosses of photoperiod insensitive X sensitive genotypes. A second objective was to determine if selection for longer SFP is possible without delaying date of physiological maturity (R7). Three populations were developed by crossing a photoperiod-insensitive genotype of Maturity Group (MG) III to photoperiod-sensitive genotypes of MG I, II, and III. Random F4-derived fines were evaluated at Ames, IA, at Isabela PR (under both natural and lighted environments), and at Hualien, Taiwan, for days from emergence to beginning flowering (R1), rapid seed-filling (R5), R7, SFP, and reproductive period (RP). Significant (P < 0.05) differences among lines, environments, and environment X genotype were observed. Phenotypic and rank correlations of Stages R1, R5, and R7 between environments ranged from 0.22 to 0.83. The range in correlation coefficients for SFP and RP was from 0.06 to 0.62. It is possible to select lines for duration of SFP at PR environments in plantings under natural daylength or under lights. Selections in PR included genotypes ranked in the top 33% at the IA location, and generally included at least one of the five top-ranked lines. Lines may also be selected with a desired combination of duration of SFP and number of days to reach Stage R7.
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