Contributions of arbuscular mycorrhizal fungi to growth, photosynthesis, root morphology and ionic balance of citrus seedlings under salt stress
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- 作者：Qiang-Sheng Wu (1)
Ying-Ning Zou (1)
Xin-Hua He (2) - 关键词：Arbuscular mycorrhiza ; Citrus ; Ionic balance ; Photosynthesis ; Root morphology ; Salt stress
- 刊名：Acta Physiologiae Plantarum
- 出版年：2010
- 出版时间：March 2010
- 年：2010
- 卷：32
- 期：2
- 页码：297-304
- 全文大小：228KB
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Ying-Ning Zou (1)
Xin-Hua He (2)
1. College of Horticulture and Gardening, Yangtze University, No. 88 Jingmi Road, 434025, Jingzhou, Hubei, People’s Republic of China
2. School of Plant Biology (M084), University of Western Australia, Crawley, WA, 6009, Australia
文摘
A pot study was conducted to determine the effects of arbuscular mycorrhizal (AM) fungi (Glomus mosseae and Paraglomus occultum) and salt (NaCl) stress on growth, photosynthesis, root morphology and ionic balance of citrus (Citrus tangerine Hort. ex Tanaka) seedlings. Eighty-five-day-old seedlings were exposed to 100?mM NaCl for 60?days to induce salt stress. Mycorrhizal colonization of citrus seedlings was not affected by salinity when associated with P. occultum, but significantly decreased when with G. mosseae. Compared with the non-mycorrhizal controls, mycorrhizal seedlings generally had greater plant height, stem diameter, shoot, root and total plant biomass, photosynthetic rate, transpiration rate and stomatal conductance under the 0 and 100?mM NaCl stresses. Root length, root projected area and root surface area were also higher in the mycorrhizal than in the non-mycorrhizal seedlings, but higher root volume in seedlings with G. mosseae. Leaf Na+ concentrations were significantly decreased, but leaf K+ and Mg2+ concentrations and the K+/Na+ ratio were increased when seedlings with both G. mosseae and P. occultum. Under the salt stress, Na+ concentrations were increased but K+ concentrations decreased in the mycorrhizal seedlings. Under the salt stress, Ca2+ concentrations were increased in the seedlings with P. occultum or without AM fungi (AMF), but decreased with G. mosseae. Ratios of both Ca2+/Na+ and Mg2+/Na+ were also increased in seedlings with G. mosseae under the non-salinity stress, while only the Mg2+/Na+ ratio was increased in seedlings with P. occultum under the salt stress. Our results suggested that salt tolerance of citrus seedlings could be enhanced by associated AMF with better plant growth, root morphology, photosynthesis and ionic balance.