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来源于不同pH土壤上的各种大豆基因型利用难溶性磷源有明显差异。采用分别代表着南方、西北和东北本地品种三种基因型大豆,研究它们生物量、磷素积累、分泌的有机酸、根际pH和磷素利用效率(PUE)的差异。三种基因型大豆都比较偏爱Al-P,然而,绥农10号和泥巴豆在利用Al-P时,生物量比Na-P分别少8.5%和9.4%,比Ca-P和Fe-P分别多5.3%和11.8%,6.4%和42.2%。新大豆1号利用Al-P时生物量比Na-P、Fe-P和Ca-P分别多1.4%、20.8%和40.8%。地上部、根系和根瘤含磷量变化范围分别在1.37～2.47 mg/g、1.39～3.04 mg/g和3.20～4.73mg/g。绥农10号、新大豆1号和泥巴豆最大总磷含量分别出现在Al-P、Fe-P和Fe-P条件下。泥巴豆根系分泌的有机酸表现出下面的顺序:草酸>乳酸>苹果酸;新大豆1号表现为:乳酸>苹果酸>丙二酸>草酸>柠檬酸;泥巴豆表现为:苹果酸>草酸>乳酸>柠檬酸>丙二酸。无论供给哪种形态磷源,根际pH变化范围为5.48～6.52。新大豆1号磷素利用效率比绥农10号和泥巴豆高,绥农10号、新大豆1号和泥巴豆最大磷素利用效率分别出现在Al-P、Al-P和Na-P源条件下。这些结果表明,不同基因型大豆生长和磷吸收对各种难溶磷源的反应不同,各基因型磷素利用差异与根系分泌物和根际pH有关。
Various soybean genotypes from different pH soils differed markedly with the use of poorly soluble phosphate sources. Three genotypes, Soybean, representing the native varieties of the south, northwest and northeast, respectively, were used to study their biomass, phosphorus accumulation, and secretion of organic acids. The differences in rhizosphere pH and phosphorus utilization efficiency (PUE) were studied. However, Suinong 10 and Mudouban use 8.5% and 9.4% less Na-P than Al-P, respectively, compared with Ca-P and Fe-P Up 5.3% and 11.8%, 6.4% and 42.2% respectively. Compared with Na-P, Fe-P and Ca-P, the biomass of Al-P increased by 1.4%, 20.8% and 40.8% respectively. The contents of P in shoots, roots and nodules varied from 1.37 to 2.47 mg / g, 1.39 to 3.04 mg / g and 3.20 to 4.73 mg / g, respectively. Suinong 10, the new soybean and the largest total phosphorus content of muddy beans appear in Al-P, Fe-P and Fe-P conditions. The organic acids secreted by root of muddy bean showed the following order: oxalic acid> lactic acid> malic acid; new soybean No.1 showed: lactic acid> malic acid> malonic acid> oxalic acid> citric acid; > Lactic acid> citric acid> malonic acid. No matter what type of phosphorus source is supplied, the pH range of rhizosphere is 5.48 ~ 6.52. Phosphorus utilization efficiency of new soybean No.1 was higher than that of Suinong 10 and muddy beans, and highest phosphorus utilization efficiency of Suinong 10, Xinandou 1 and muddy beans appeared in Al-P, Al-P and Na-P sources Condition. These results indicate that the responses of different genotypes to soybean growth and phosphorus uptake are different for all kinds of insoluble phosphorus sources. The differences in phosphorus utilization among genotypes are related to root exudates and rhizosphere pH.