Journal of Food, Agriculture and Environment

Vol 7, Issue 3&4,2009
Online ISSN: 1459-0263
Print ISSN: 1459-0255

Role of arbuscular mycorrhizae in development of salt-tolerance of Trifolium alexandrinum plants under salinity stress


M. H. Gharineh 1*, H. Nadian 2, G. Fathi 1, A. Siadat 1, B. Maadi 1

Recieved Date: 2009-06-23, Accepted Date: 2009-10-03


A glasshouse experiment was conducted to study the effects of different sources (NaCl, Na2SO4, MgCl2 and MgSO4) and levels (2.2, 5 and 10 dS m-1) of salinity on plant growth and P uptake by Trifolium alexandrinum L. colonized with Glomus intraradices. The experiment had a randomized complete block design with 4 sources of salts×3 levels of salinity×2 mycorrhiza (with and without G. intraradices) arranged in factorial combination with three replications. The results showed that shoot dry weight of both mycorrhizal and non-mycorrhizal plant decreased with increasing soil salinity, particularly when the soil was supplied with NaCl. However, shoot dry weight of mycorrhizal plant was greater than that of non-mycorrhizal plant at all soil salinity levels. A similar trend was observed for root dry weight of clover plant. The detrimental effect of soil salinity on mycorrhizal root growth was more pronounced than that on mycorrhizal shoot growth. The detrimental effects of NaCl on plant growth were much higher than those of MgCl2, Na2SO4 and MgSO4 as their concentration was increased. Results of this study, with respect to the specific effects of ions, show that clover plants, as a sensitive plant to soil salinity, were more considerably affected by sodium and chloride than by magnesium and sulphate. Increasing soil salinity decreased the percentage of root colonization. This led to a decline in P uptake. Decline in P uptake can be attributed to the reduction in root colonization due to the increase in soil salinity. In fact, the decline in root colonization with increasing soil salinity leads to a decline in surface area of interface for nutrients transfer to the host plant.


Arbuscular mycorrhiza, salinity, Trifolium alexandrinum, P uptake

Journal: Journal of Food, Agriculture and Environment
Year: 2009
Volume: 7
Issue: 3&4
Category: Agriculture
Pages: 432-437

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