大豆利用难溶磷源基因型差异(英文)

Genotypic Variation in P Utilization of Soybean(Glycine max L.)Grown in Various Insoluble P Sources

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。

The information on soybean genotypes originating from different pH soil utilized insoluble P sources was various. Three soybean genotypes representing typical native species were collected from south, western and northeast of China. Plant biomass, P accumulation, organic acid excretion,pH and PUE were analysed. Three genotypes all favoured in Al-P, however, Suinong 10 and Nibadou total biomass in Al-P was 8. 5% and 9. 4% less than Na-P,respectively,then 5.3% and 11.8% ,6.4% and 42.2% more than Ca-P and Fe-P,respectively; For Xin soybean 1 total biomass was 1.4% ,20.8% and 40.8% more than Na-P,Fe-P and Ca-Pcrespectively. P concentration ranged from 1.37 to 2. 47 mg/g,1.39 to 3.04 mg/g and 3.20 to 4. 73 mg/g in shoots,roots and nodules, respectively. The maximum total P concentration was Al-P, Fe-P and Fe-P in Suinong10, Xin soybean 1 and Nibadou,respectively. Irrespective of genotype, the amount of organic acid exuded followed the order L（--）- malic〉Oxalic〉L（＋）-lactic〉Malonic〉Succinic〉Citric. However,for Suinong 10 the order was Oxalic〉L （＋）-lactic〉L（--）-malic,for Xin soybean 1 the order was L（＋）-lactic〉L（--）-malic 〉 Malonic〉Oxalic〉 Citric and for Nibadou the order was L （--）-malic〉Oxalic〉L（＋）-lactic〉Citric〉Malonic. Solution pH ranged from 5. 48 to 6. 52. PUE （phosphorus use efficiency） in Xin soybean 1 was more than Suinong, 10 and Nibadou,irrespective of P source. The maximum PUE was Al-P,Al-P and Na-P in Suinong 10,Xin soybean 1 and Nibadou. The results suggest that soybean genotypes differ in growth：response and P uptake from insoluble P sources andgenotypic variation in P acquisition was related to root exudation and pH.