Influence of Vesicular-Arbuscular Mycorrhiza on the Hydraulic Conductivity of Roots of Two Citrus Rootstocks

Carrizo citrange (CC) and sour orange (SO) seedlings were grown in a low phosphorus (P) sandy soil and either inoculated with Glomus intraradices Schenck & Smith or fertilized with soluble P. Mycorrhizal seedlings had nutritionally sufficient levels of leaf P, non-mycorrhizal plants of similar s...

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Bibliographic Details
Published in:The New phytologist 1984-06, Vol.97 (2), p.277-284
Main Authors: Graham, J. H., Syvertsen, J. P.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Biological and medical sciences
Citrus
Economic plant physiology
Fundamental and applied biological sciences. Psychology
Glomus intraradices
Hyphae
Mycorrhizas
nutrient uptake
Nutrition
Parasitism and symbiosis
phosphorus
phosphorus nutrition
Plant physiology and development
Plant roots
Plants
Root hydraulic conductivity
Rootstocks
Seedlings
Soil water
Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)
Transpiration
transpiration rate
vesicular-arbuscular mycorrhizas
water conductivity
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Summary:Carrizo citrange (CC) and sour orange (SO) seedlings were grown in a low phosphorus (P) sandy soil and either inoculated with Glomus intraradices Schenck & Smith or fertilized with soluble P. Mycorrhizal seedlings had nutritionally sufficient levels of leaf P, non-mycorrhizal plants of similar size were P-deficient. The root-shoot ratio of both rootstocks was reduced by mycorrhizal colonization, but root hydraulic conductivity per unit root length of mycorrhizal CC and SO was more than twice that of non-mycorrhizal seedlings under well-watered conditions. Mycorrhizal plants also had significantly higher transpiration rates when standardized on a root length basis, and greater transpiration appeared to be related to the increased conductivity of roots. Flow of water to roots via hyphae alone could not account for the greater water uptake by mycorrhizal roots. Apparently, mycorrhizal enchancement of P nutrition was primarily responsible for the greater conductivity of roots since no differences were found between root hydraulic conductivity of mycorrhizal and non-mycorrhizal CC of equal P status under well-watered conditions.
ISSN:0028-646X
1469-8137
DOI:10.1111/j.1469-8137.1984.tb04132.x