Effects of soil phosphorus and Glomus intraradices on growth, nonstructural carbohydrates, and photosynthetic activity of Citrus aurantium

Sour orange (Citrus aurantium L.) grown in low-P (9-12 ppm) and high-P (420 ppm) soil inoculated with or without Glomus intraradices (G.i.), were evaluated for biomass, carbohydrates, ribulose bisphosphate carboxylase (RuBPCase), phosphoenolpyruvate carboxylase (PEPCase) activity, leaf ¹⁴CO₂ incorpo...

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Bibliographic Details
Published in:Plant and soil 1990-11, Vol.128 (2), p.257-263
Main Authors: Nemec, S. (United States Dept. of Agriculture ARS, Orlando, FL (USA)), Vu, J.C.V
Format: Article
Language:English
Subjects:
Acid soils
Agronomy. Soil science and plant productions
Biological and medical sciences
CITRUS AURANTIUM
Economic plant physiology
FOSFORO
FOTOSINTESIS
Fundamental and applied biological sciences. Psychology
Fungi
GLOMUS
growth
Leaves
MYCORHIZE
MYCORRHIZAE
Net assimilation, photosynthesis, carbon metabolism. Photorespiration, respiration, fermentation (anoxia, hypoxia)
nutrient deficiency
Nutrition. Photosynthesis. Respiration. Metabolism
Orchard soils
PHOSPHORE
PHOSPHORUS
PHOTOSYNTHESE
PHOTOSYNTHESIS
Plant growth
Plant roots
Plants
Soil fungi
Soil inoculation
Soil treatment
vesicular-arbuscular mycorrhizas
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Summary:Sour orange (Citrus aurantium L.) grown in low-P (9-12 ppm) and high-P (420 ppm) soil inoculated with or without Glomus intraradices (G.i.), were evaluated for biomass, carbohydrates, ribulose bisphosphate carboxylase (RuBPCase), phosphoenolpyruvate carboxylase (PEPCase) activity, leaf ¹⁴CO₂ incorporation, and other physiological parameters. Growth of plants in the low-P, noninoculated soil was lowest, with total dry biomass reduced up to half of the low-P, inoculum treatment. Total nonstructural carbohydrates were 40% lower in leaves of plants in the low-P, noninoculated soil, compared with the other treatments. Inoculation of the low-P soil enhanced leaf ¹⁴CO₂ incorporation by 67%, total chlorophyll content by 28%, and RuBPCase activity by 42%, compared with low-P, noninoculated treatment. Improved P-use efficiency by G.i. in low-P soil was comparable to high-P nutrition in improving leaf ¹⁴CO₂ incorporation and concentration of major leaf photosynthetic products that include starch and sucrose. Leaf PEPCase activity in the low-P, noninoculated treatment, however, was at least threefold higher than the other treatments, suggesting a possible alteration in organic acid metabolism in sour orange leaves as a result of P deficiency.
ISSN:0032-079X
1573-5036
DOI:10.1007/BF00011117