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Genotype and Environmental Effects on Natto Soybean Quality Traits

Eastern Cereal and Oilseed Research Centre, Agric. & Agri-Food Canada, Ottawa, Ontario, Canada, K1A 0C6

^* Corresponding author (coberer{at}em.agr.ca).

Production of small-seeded natto soybean [Glycine max (L.) Merr.] has increased in eastern Canada during the past decade. Improved natto quality characteristics are important for maintaining and increasing this market. This study was conducted to examine environmental and genotype x environment effects on quality characteristics. Two data sets were used for statistical analysis: seven lines grown at five locations in 1989 and 1990 (Data Set 1) and fifteen lines grown at the same five locations in 1993 and 1994 (Data Set 2). Quality characteristics important in natto production were measured: smallseed fraction, percentage of seeds with impermeable seed coats, water uptake, seed shape, and levels of the seed constituents, Ca, oil, and sugar. Genotypes were significantly different for most traits in both data sets. Location effects were not significant for any quality traits. Year effects were significant only for seed shape and sugar levels in Data Set 2. Year x location interactions were often significant, but no patterns were apparent in these interactions. Genotype x environment interactions were often significant, but these variance components were usually an order of magnitude smaller than the main effects of genotype. These results indicate that it is possible to develop natto soybean cultivars that are broadly adapted to the short-season areas of eastern Canada.

Received for publication June 5, 1996.

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