Seedling treatments and phosphorus solution concentrations affect nodulation and nodule functions in soybean (Glycine max L.)
2007
S.J. Miao | X.Z. Han | X.B. Liu | Y.F. Qiao
The effect of three seedling treatments: T0, normal germination; T1, cotyledons removed; T2, cotyledons removed 5 days earlier than in T1; and two phosphorus levels (P0 and P30) on nodulation and nodule function in soybean [Glycine max (L.) Merr.] were investigated in nutrient solution culture. The number of nodules formed at P0 was in the order T2 > T0 > T1, but it was T0 > T2 > T1 at P30. Nodule dry weight per plant had the same tendency as the nodule number. Nodule size (dry weight per nodule) in seedlings ranged from 0.601 to 1.089 mg in the order T0 > T1 > T2, regardless of P level. For example, nodule size in T0 was larger by 86% and 52% than T2 at P0 and P30, respectively. Furthermore, regardless of P level, a specific acetylene reduction activity (ARA, µM C2H4/h/g nodule) increased with P content in seedlings, but no significant difference was found (P < 0.05). Leghemoglobin (Lb) content was not significantly affected by P level; however, seedlings (T0 and T1) significantly affected the Lb content per unit plant biomass (P < 0.05). All these results suggest that seedling P content plays a key role in nodulation and nodule function of soybean.
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