Wu Qiangsheng, Xia Renxue
College of Horticulture and Forestry, Huazhong Agricultural University, Wuhan 430070, China.
Ying Yong Sheng Tai Xue Bao. 2005 May;16(5):865-9.
With pot experiment in a greenhouse, this paper studied the effects of arbuscular mycorrhizal (AM) fungi Glomus mosseae on the drought tolerance of citrus grafting seedling trifoliate orange/cara cara under natural water stress and rewatering. The results showed that inoculation with AM fungi significantly increased the plant height, stem diameter, leaf area, and shoot length of test seedling. At the 4th day of rewatering, mycorrhizal plant had significantly higher root soluble protein content and superoxide dismutase (SOD) and catalase (CAT) activities than non-mycorrhizal plant. An interaction between water and AM fungi could significantly promote leaf SOD activity. During natural water stress and rewatering, AM fungi inoculation could decrease the leaf content of malondialdehyde (MDA), increase those of soluble sugar and soluble protein, and enhance the activities of SOD, peroxidase (POD) and CAT. As a result, the capability of osmotic adjustment and protective recovery, and thus, the drought tolerance of mycorrhizal citrus grafting seedling were improved. The mechanism that AM fungi could enhance the drought tolerance of host plant might be related to the protective system of host plant.
通过温室盆栽试验，研究了丛枝菌根（AM）真菌摩西球囊霉对自然水分胁迫及复水条件下柑橘嫁接苗枳橙/红肉脐橙耐旱性的影响。结果表明，接种AM真菌显著增加了试验苗木的株高、茎粗、叶面积和新梢长度。复水第4天，菌根化植株的根系可溶性蛋白含量、超氧化物歧化酶（SOD）和过氧化氢酶（CAT）活性显著高于非菌根化植株。水分与AM真菌之间的互作能显著促进叶片SOD活性。在自然水分胁迫和复水过程中，接种AM真菌可降低叶片丙二醛（MDA）含量，增加可溶性糖和可溶性蛋白含量，提高SOD、过氧化物酶（POD）和CAT活性。从而提高了菌根化柑橘嫁接苗的渗透调节能力和保护恢复能力，进而增强了其耐旱性。AM真菌增强寄主植物耐旱性的机制可能与寄主植物的保护系统有关。
