Comparison of plant growth, yield, and mineral accumulation between a low-phytate soybean line and the cultivar 'Enrei'

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  • 低フィチンダイズと普通栽培品種エンレイの生育,収量および栄養成分の比較
  • テイフィチンダイズ ト フツウ サイバイ ヒンシュ エンレイ ノ セイイク,シュウリョウ オヨビ エイヨウ セイブン ノ ヒカク

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Abstract

We conducted a series of field experiments in 2005 and 2008 to compare the characteristics of the low-phytate soybean (Glycine max (L) Merr.) line CX1834 with those of the cultivar 'Enrei' by comparing plant growth, yield, and the contents of phytic acid, phosphorus (P), calcium (Ca), magnesium (Mg), potassium (K), crude protein, and isoflavone. The length of the main stem, number of nodes, and shoot dry weight of the low-phytate line were higher than those of 'Enrei' at full maturity in both years. The number of pods, number of seeds per pod, number of seeds per plant, and seed yield were also higher in the low-phytate line. There was no significant difference in the total phosphorus (TP) content of seeds from the two lines in 2005, but TP was higher in the low-phytate line in 2008. The phytic acid content was around 50% lower in the low-phytate line, whereas the inorganic P content was five times that in 'Enrei' in both years. The K, Ca, Mg, crude protein, and isoflavone contents were similar. In Enrei, the phytic acid content increased from 20 to 30 days after anthesis, and increased linearly until full maturity. In the low-phytate line, in contrast, phytic acid did not accumulate with increasing seed maturity, indicating that the synthesis of phytic acid was suppressed. The results suggest that decreased phytic acid synthesis did not affect soybean growth, yield, nutrient accumulation, or seed quality.

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