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首页> 外文期刊>Environmental and experimental botany >Phosphorus deficiency does not enhance proton release by roots of soybean [Glycine max (L.) Murr.]
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Phosphorus deficiency does not enhance proton release by roots of soybean [Glycine max (L.) Murr.]

机译：缺磷并不能增强大豆根部的质子释放[Glycine max（L.）Murr。]。

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Little work has been done on root exudation in soybean under P deficiency. This study examined the effect of P supply on release of protons and carboxylates by roots of soybean (Glycine max Heinong 35), and to correlate the release with excess uptake of cations over anions. Plants were either reliant on N fixation or supplied with nitrate and were grown in nutrient solution with 1-50oM P for 7 weeks. Release of protons and carboxylates from roots, and concentrations of Ca, Mg, K, Na, P, S, Cl and N in plants were measured weekly from week 4. Unlike in many other species, P deficiency decreased proton release per unit root biomass in N-fixing plants and increased release of hydroxyl ions in nitrate-fed soybean. While P deficiency generally decreased uptake of K, Ca, Mg, S, Cl and P, it increased nitrate uptake per unit root biomass. Irrespective of P supply, amounts of protons released correlated well with excess uptake of cations over anions by the roots. Phosphorus deficiency increased release of carboxylates but the amounts released were small. The results suggest that soybean displays strategies of P acquisition through decreasing proton release which favors P mobilization in acid soils, and increasing root-to-shoot ratio and specific root length.
机译：缺磷条件下大豆根系分泌物的研究很少。这项研究检验了磷的供应对大豆根系（Glycine max Heinong 35）释放质子和羧酸盐的影响，并将释放与阳离子对阴离子的吸收相关。植物要么依靠固氮，要么供应硝酸盐，然后在营养液中以1-50oM P的浓度生长7周。从第4周开始每周测量一次植物根部质子和羧酸盐的释放以及Ca，Mg，K，Na，P，S，Cl和N的浓度，这与许多其他物种不同，P缺乏会降低单位根生物量的质子释放。在固氮植物中，硝酸盐喂养的大豆中氢氧根离子的释放增加。缺磷通常会降低钾，钙，镁，硫，氯和磷的吸收，但会增加单位根生物量的硝酸盐吸收。不论磷的供应量如何，释放的质子量与根部对阴离子的吸收超过与阴离子的过量吸收。磷缺乏增加了羧酸盐的释放，但释放的量很小。结果表明，大豆表现出通过减少质子释放来促进磷的吸收的策略，这有利于酸性土壤中的磷动员，并增加了根茎比和比根长。

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