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首页> 外文期刊>Soil Biology & Biochemistry >Genotypic variability in P use efficiency for symbiotic nitrogen fixation is associated with variation of proton efflux in cowpea rhizosphere
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Genotypic variability in P use efficiency for symbiotic nitrogen fixation is associated with variation of proton efflux in cowpea rhizosphere

机译：cow豆根际中磷利用效率对共生固氮的基因型变异与质子外流变化有关

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摘要

Vigna unguiculata sp., or cowpea, varieties vary in their adaptation to low-P soils. In order to investigate to what extent this variation may be related to P use efficiency and proton efflux by nodulated roots, three genotypes, 26-73, Danila and Melakh, inoculated with Bradyrhizobium sp. Vigna CB756 were grown in hydroaeroponic culture in a glasshouse at two levels of phosphorus supply corresponding to P sufficiency or P deficiency. After 4 weeks, individual symbiotic-plants were transferred to a reference-soil layer in a rhizotron, and harvested after 2 further weeks. Nodule and shoot biomass were less when P was deficient. The effect of P deficiency on biomass production followed the trend Danila > 26-73 > Melakh. Under P deficiency, the proton efflux for the P-efficient genotype 26-73 was 43% and 60% greater than for the P-inefficient Danila in hydroaeroponics and in soil, respectively. This increase in proton efflux was associated with an increase in nodule specific respiration that was 115% greater for Danila than for 26-73. It is concluded that the genotypic variability in P use efficiency for symbiotic nitrogen fixation is associated with a variation in nodulated-root proton efflux and respiration in cowpea rhizosphere, and that these parameters should be measured for more contrasting genotypes in order to test whether they correlate with the adaptation of N2-dependent legumes to low-P soils.
机译：gna豆（Vigna unguiculata sp。）或cow豆在适应低磷土壤上的适应性有所不同。为了研究这种变异可能与根瘤菌根系接种根瘤菌的三种基因型26-73，Danila和Melakh的根瘤根的磷利用效率和质子外流有关。 Vigna CB756在玻璃温室的水培养殖中以对应于P充足或P不足的两种磷供应水平生长。 4周后，将各个共生植物转移至根际控管的参考土壤层中，并在另外2周后收获。当磷缺乏时，根瘤和芽生物量较少。磷缺乏对生物量生产的影响遵循“ Danila> 26-73> Melakh”趋势。在缺磷条件下，P效率基因型26-73的质子外流在水培和土壤中分别比P效率低的Danila大43％和60％。质子外流的增加与结节特异性呼吸的增加有关，达尼拉比26-73大115％。结论是，that素共生固氮利用效率的基因型变异与cow豆根际根结质子外流和呼吸变化有关，应该对这些参数进行比较，以比较不同的基因型，以检验它们是否相关依赖N2的豆科植物适应低磷土壤。

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