www.nature.com/scientificreports OPEN received: 06 July 2016 accepted: 09 January 2017 Published: 09 February 2017 Mycorrhizas alter sucrose and proline metabolism in trifoliate orange exposed to drought stress Hui-Hui Wu1,2,*, Ying-Ning Zou1,2,*, Mohammed Mahabubur Rahman3, Qiu-Dan Ni1,2 & Qiang-Sheng Wu1,2,4 Arbuscular mycorrhizal fungi (AMF) can enhance drought tolerance in plants, whereas little is known regarding AMF contribution to sucrose and proline metabolisms under drought stress (DS) In this study, Funneliformis mosseae and Paraglomus occultum were inoculated into trifoliate orange (Poncirus trifoliata) under well watered and DS Although the 71-days DS notably (P