|Budget Amount *help
¥1,400,000 (Direct Cost : ¥1,400,000)
Fiscal Year 1996 : ¥400,000 (Direct Cost : ¥400,000)
Fiscal Year 1995 : ¥1,000,000 (Direct Cost : ¥1,000,000)
Although cultivation and utilization of adzuki bean are almost restricted to east Asian region, the seeds contain about 24% protein which means a nutritious value equivalent to or more than those of the other pulse crops except soybean and peanut. This research was conducted to obtain fundamental information for improvement of seed protein content in adzuki beans.
(1) Accumulation and redistribution of dry matter (DM) and nitrogen (N) with plant growth : Three cultivars differing in maturity and one of them were planted in 1995 and in 1996, respectively. DM and N in leaf blade, leaf sheath (including dropped parts), and stem increased sharply from 0 to 20 days after flowering (DAF) and then decreased. Redistribution of DM and N from vegetative parts to seed, estimated from their decrements, averaged 19% and 36%, respectively, with a small difference among cultivars and years. The major source of redistribution was leaf blade (43% for DM and 75% for N). N of leaf blade remained approximately constant with 4% from 0 to 20 DAF and decreased to 2% at abscission, whereas N of seed was held at 4% level after 20 DAF,although later-flowered seed showed somewhat lower N.
(2) Genotypic variability in seed protein content and its stability : Eighty-eight genotypes including foreign introduction were planted at two locations (Sapporo and Memuro) and for two years. On the average over four cultural conditions, seed protein varied 22.0 to 27.6% among genotypes, but 50% or more distributed in the narrow range of 23.0 to 24.5%. Since large interactions between genotype and cultural condition were found, broad sence heritability for seed protein was only 0.40 (cf. 0.85 for seed size). Seed protein was negatively related with seed size (-0.329^<****>) and hed no relationship with seedcoat color.