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磷是大豆体内重要化合物的组成因素,缺磷胁迫会影响大豆植株对磷素的吸收和分配,从而影响干物质的积累。通过采用砂培方法,自大豆V3期开始,连续进行4次缺磷处理,研究了缺磷胁迫对大豆植株磷素和干物质积累的影响。结果表明:在苗期至花期和花荚期缺磷胁迫,磷素由幼嫩向成熟生长和已成熟的叶部向外转移,以供给新生长的茎叶根和荚果对磷素的需要;苗期至花荚期缺磷处理对成熟和由幼嫩向成熟生长的叶片干物质积累影响不明显,说明叶片在向外输出磷素时,预留出自身生长需要的磷素;在结荚、鼓粒期缺磷胁迫,可导致成熟营养器官早衰;缺磷处理对干物质影响明显小于对磷素积累的影响,说明外界磷素供应不足时,大豆植株会更高效地利用磷素。
Phosphorus is an important component of soybean body composition, phosphorus deficiency stress will affect soybean plant absorption and distribution of phosphorus, thus affecting the accumulation of dry matter. By using sand culture method, four phosphorus-deficient treatments were carried out continuously from the beginning of soybean V3 stage to study the effects of phosphorus deficiency on the accumulation of phosphorus and dry matter in soybean plants. The results showed that in the seedling stage-flowering stage and flower-stage, phosphorus was transferred from young to matured and mature leaves in late stage to supply new stems, roots and pods for phosphorus. The effect of P deficiency during seedling stage on flowering and podding stage was not obvious for the maturity and leaf dry matter accumulation from young to mature, which indicated that the leaves could reserve the necessary phosphorus for their growth when they were exported outwards. , Phosphorus deficiency stress at the stage of grain-filling could lead to premature decline of mature vegetative organs. The effect of phosphorus-deficiency treatment on dry matter content was less than that of phosphorus accumulation, which indicated that soybean plants would utilize phosphorus more efficiently when the external supply of phosphorus was insufficient.