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Effect of neutral and pathogenic fungi on mycorrhizal and non-mycorrhizal Picea roots: Transpiration and accumulation of the stress metabolite aminocyclopropane carboxylic acid



Effect of neutral and pathogenic fungi on mycorrhizal and non-mycorrhizal Picea roots: Transpiration and accumulation of the stress metabolite aminocyclopropane carboxylic acid



Journal of Plant Physiology 140(5): 605-610



Ectomycorrhiza of Picea abies seedling with Pisolithus tinctorius were synthesized rapidly in a Petri dish culture system under axenic conditions. Mycorrhizal and non-mycorrhizal seedlings of P. abies were infected with either Trichoderma harzianum, Fusarium oxysporum or Sclerotium rolfsii, respectively. The transpiration rate was measured to compare the effect of the various fungi on the mycorrhizal and non-mycorrhizal plantlets. At first, the transpiration of mycorrhizal plantlets declined after inoculation with T. harzianum and F. oxysporum, but it increased again later and almost reached the value of the control. This recovery did not occur when non-myocorrhizal plantlets were inoculated with these fungi; the transpiration rate decreased in a few days to around half of the initial value and remained at this low level for the rest of the measuring period. After infection of non-mycorrhizal roots with S. rolfsii, the rate of transpiration dropped to zero in 5 days. It decreased similarly in mycorrhizal plantlets but remained at about 20% of the initial value for some days. In this case, both non-mycorrhizal and mycorrhizal plantlets died eventually. The stress metabolite aminocyclopropane carboxylic acid (ACC) was formed in the roots of mycorrhizal as well as non-mycorrhizal plantlets upon infection with the pathogenic fungi S. rolfsii and F. oxysporum, and also with the neutral fungus T. harzianum. Bare roots, which were brought into contact with the mutualistic fungus P. tinctorius, formed no ACC at all.

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Accession: 008539823

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DOI: 10.1016/s0176-1617(11)80796-0


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