Paper Information

Journal:   IRANIAN JOURNAL OF HORTICULTURAL SCIENCE AND TECHNOLOGY   WINTER 2010 , Volume 10 , Number 4; Page(s) 293 To 304.
 
Paper: 

THE EFFECTS OF ARABUSCULAR MYCORRHIZAL FUNGI ON WATER RELATION OF ONION

 
 
Author(s):  BOLANDNAZAR S., NEISHABURY M.R., ALIASHARZADEH N., CHAPARZADEH N.
 
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Abstract: 

Mycorrhizal fungi play an important role in the water and mineral nutrients uptake improvement from soil. In order to investigate the effect of arbuscular mycorrhizal fungi on water relation of onion cv. ‘Red Azarshahr’ under three irrigation intervals in two soil condition (sterile and unsterile) in a greenhouse pot experiment carried out in the University of Tabriz, Tabriz, Iran. Three preinoculated onion seedling in nursery with Glomus versiforme, Glomus intraradices and Glomus etunicatum and uninoculated seedling as a control were transplanted to the pots filled with 7 kg soil. Plants were irrigated to the field capacity every 7, 9 and II days. Along trial period, leaf relative water content (RWC), osmotic potential and free proline content were measured, then leaf potential adjustment were computed. The results indicated that, nonmycorrhizal onions had significantly higher RWC than mycorrhizal ones. Mycorrhizal onions showed lower osmotic potential and free proline than control plants, so mycorrhizal colonization improved osmotic adjustment. It was concluded that mycorrhizal onions could reduce water deficit stress by lowering leaf osmotic potential through improving absorption and accumulation of mineral solutes that enable plants to improve osmotic adjustment to uptake water from drying soil.

 
Keyword(s): ARBUSCULAR MYCORRHIZAL FUNGI, ONION, OSMOTIC ADJUSTMENT, WATER RELATION
 
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