本项目利用前期研究筛选的能促进枳砧纽荷尔脐橙镁吸收与转运的丛枝菌根真菌，研究镁适量及缺镁胁迫下菌根化与非菌根化枳及枳砧纽荷尔脐橙根系分泌物组分与含量、根际镁形态及其动态的差异，结合其解剖结构及相关生理指标差异，以探明缺镁胁迫下菌根化枳砧纽荷尔脐橙根际镁的活化与吸收的生理机制。研究结果能为下一步在蛋白质组水平上探讨丛枝菌根促进枳砧纽荷尔脐橙镁吸收与转运的机制奠定基础，还为解决生产上纽荷尔脐橙缺镁问题提供新的理论和实践依据。

The arbuscular mycorrhizal fungus having been identified to have a promoting role in Mg uptake and translocation in Newhall navel orange grafted on trifoliate orange from the preliminary study, will be used in this program, the differences in secretion components and concentrations in roots, Mg forms and their dynamics in rhizosphere of mycorrhizal and non-mycorrhizal trifoliate orange and Newhall navel orange grafted on trifoliate orange will be investigated under Mg adequacy and Mg deficiency stress, combination with the differences in anotomical features and related physiological indices, with an attempt to clarify the physiological mechanism underlying Mg activation and uptake in rhizosphere of mycorrhizal Newhall navel orange grafted on trifoliate orange under Mg deficiency stress. The results could not only provide foundation on exploring promotion mechanism of arbuscular mycorrhizas on Mg uptake and translocation in Newhall navel orange grafted on trifoliate orange at proteomic level further, but also offer a new theoretical and practical basis in solving Mg deficiency problems in Newhall navel orange in production.