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本文以磷效率不同的两个大豆品种为材料,研究大豆幼苗期子叶酸性磷酸酶活性和同工酶谱对外源磷有效性的响应,及其参与子叶磷高效转运和利用的过程。结果表明:在幼苗生长前期,子叶酸性磷酸酶活性及其同工酶谱组成变化明显,而且不受外源磷有效性的调控;在幼苗生长的前8天,子叶全磷含量随着酸性磷酸酶的活性增加而显著降低,而且磷高效大豆品种比磷低效大豆品种具有较高的酸性磷酸酶活性和植株全磷含量。以上结果说明在大豆幼苗生长前期,由于大粒种子不仅具有较高的磷含量,而且具有较高子叶酸性磷酸酶活性,促进子叶有机磷的水解和转运是磷高效大豆品种适应低磷胁迫的生理机制之一。
In this paper, two soybean cultivars with different phosphorus efficiency were used as materials to study the response of acid phosphatase activity and isoenzyme pattern of soybean leaves at seedling stage to the availability of exogenous phosphorus, and their involvement in the efficient transport and utilization of phosphorus in cotyledon. The results showed that in the early stage of seedling growth, the activity of cotyledon acid phosphatase and its isoenzyme composition changed obviously, and it was not affected by the availability of exogenous phosphorus. In the first 8 days of seedling growth, Enzyme activity increased significantly reduced, and phosphorus-efficient soybean varieties than phosphorus inefficient soybean varieties have high acid phosphatase activity and plant total phosphorus content. The above results showed that in the early stage of soybean seedling growth, the large-sized seeds not only had high phosphorus content, but also had higher foliar acid phosphatase activity, promoted the hydrolysis and translocation of organic phosphorus in cotyledons, which was the physiological mechanism of phosphorus-efficient soybean varieties to adapt to low-phosphorus stress one.