接种丛枝菌根真菌对枳吸收利用磷酸铝的影响

Effects of inoculation with arbuscular mycorrhizal fungi on AlPO_4 uptake by Poncirus trifoliata.

在温室沙培条件下,以枳实生苗为试材,研究了丛枝菌根真菌摩西球囊霉和地表球囊霉对枳吸收利用难溶性磷酸盐(Al-P)的影响.结果表明:接种菌根真菌显著增加了枳的干物质量、含磷量及磷吸收量,且随Al-P施用量的提高,菌根贡献率、全株磷吸收量、真菌磷吸收量及真菌磷吸收贡献率显著增加;接种处理显著增加了枳根系与菌丝磷酸酶的分泌量,特别是酸性磷酸酶和中性磷酸酶的分泌量,但二者随施磷量的增加而降低.真菌磷吸收贡献率与酸性磷酸酶、中性磷酸酶、碱性磷酸酶和总磷酸酶含量呈极显著正相关.

With sand culture in greenhouse, this paper studied the effects of inoculation with arbuscular mycorrhizal （AM） fungi Glomus mosseae and G. versiforme on the utilization of insoluble phosphate AlPO4 （Al-P） by trifoliate orange （Poncirus trifoliata） seedlings. The results indicated that inoculation with AM fungi notably increased the dry matter, P content, and P absorption rate of P. trifoliata. The contribution of mycorrhiza, P uptake by plant and AM fungi, and the contribution of AM fungi in P uptake by P. trifoliata increased greatly with increasing Al-P level in the medium. Inoculation with AM fungi greatly increased the excretion of phosphatase, especially acid- and neutral phosphatase, from plant root and hyphae, but the excretion amount decreased with increasing Al-P level. The contribution of the fungi in P uptake by P. trifoliata was significantly positively correlated with the amounts of acid-, neutral-, alkaline-, and total phosphatase.