Seedling treatments and phosphorus solution concentrations affect nodulation and nodule functions in soybean (Glycine max L.)
Miao, S.J.,Chinese Academy of Sciences, Harbin (China). Northeast Inst. of Geography and Agro-Ecology | Han, X.Z.,Chinese Academy of Sciences, Harbin (China). Northeast Inst. of Geography and Agro-Ecology | Liu, X.B.,Chinese Academy of Sciences, Harbin (China). Northeast Inst. of Geography and Agro-Ecology | Qiao, Y.F.,Chinese Academy of Sciences, Harbin (China). Northeast Inst. of Geography and Agro-Ecology
The effect of three 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 were investigsted in soybean seedlings in nutrient solution culture. The number of nodules formed at P0 was in the order as follows: T2 more than T0 more than T1, but at P30 it was T0 more than T2 more than T1. 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 as follows: T0 more than T1 more than T2, regardless of the P level. For example, nodule size in T0 was larger by 86% and 52% than in T2 at P0 and P30, respectively. Furthermore, regardless of the P level, the specific acetylene reduction activity increased with P concentration in seedlings, but no significant difference was found (P less than 0.05). Leghemoglobin (Lb) content was not significantly affected by the level of P; however, seedlings (T0 and T1) significantly affected the Lb concentration per unit plant biomass. All these results suggest that the concentration of P in soybean seedlings plays a key role in nodulation and nodule function.
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