Record ID No. |
5011 |
Author(s) |
Qiang-Sheng Wu, Ying-Ning Zou, Xin-Hua He , 2013 |
Affiliation |
College of Horticulture and Gardening, Yangtze University, 88 Jingmi Road, Jingzhou, Hubei 434025, China, Email: wuqiangsh@163.com |
Title |
Mycorrhizal symbiosis enhances tolerance to NaCl stress through selective absorption but not selective transport of K+ over Na+ in trifoliate orange |
Source. Vol.(no):Page |
Scientia Horticulturae 160(August): 366-374p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Soil plant relations |
Sub-subjects |
Difficult sites |
Host |
Poncirus trifoliata |
Organism |
Funneliformis mosseae |
Country |
China, East Asia |
Abstracts |
Selectivity of potassium ion (K+) over sodium ion (Na+) is essential to understand plant's tolerance to salt stress, whereas information is limited whether arbuscular mycorrhizal fungi (AMF) increase selective absorption or transport of K+ over Na+(SAK+/Na+βββor STK+/Na+) in host plants. The 61-d-old trifoliate orange (Poncirus trifoliata ) inoculated with or without an AM fungus Funneliformis mosseae was subjected to 45-day 100 mM NaCl stress. The AMF inoculation significantly increased plant growth (height, leaf number, stem diameter and biomass production), leaf relative water content (LRWC), and tissue K+ absorption but decreased Na+ absorption under no-NaCl or NaCl stress. Mycorrhization also significantly increased ratio of K+/Na+ in leaf, root and total plant under no-NaCl and NaCl stress. Meanwhile mycorrhizal seedlings showed higher SAK+/Na+ under no-NaCl and NaCl stress, and higher STK+/Na+ under no-NaCl stress but lower STK+/Na+ under NaCl stress. In addition, SAK+/Na+ significantly positively correlated with LRWC and almost all tested growth traits, whilst STK+/Na+ only with leaf number and root biomass. These results suggested that it was the mycorrhizal-mediated increase of SAK+/Na+, rather than STK+/Na+, under NaCl stress, that could enhance the plant's tolerance to NaCl stress, thus conferring a greater LRWC and plant growth in mycorrhizal citrus seedlings. |