Record ID No. |
1847 |
Author(s) |
Wu Q.S., Xia R.X., Zou Y.N , 2008 |
Affiliation |
Yangtze University, Colleg Horticulture & Gardening, 88 Jingmi Rd, Jinzhou 434025, Hubei Province, PEOPLES R CHINA |
Title |
Improved soil structure and citrus growth after inoculation with three arbuscular mycorrhizal fungi under drought stress |
Source. Vol.(no):Page |
European Journal of Soil Biology.44(1):122-128p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Miscellaneous |
Organism |
n.a. |
Country |
CHINA, Asia |
Abstracts |
In a controlled potted experiment, citrus (Poncirus trifoliata) seedlings were
inoculated with three species of arbuscular mycorrhizal (AM) fungi, Glomus mosseae, G. Versiforme
or G. Diaphanum. Two soil-water levels (ample water, -0.10 MPa; drought stress, -0.44 MPa) were
applied to the pots 4 months after transplantation. Eighty days after water treatments, the soils
and the citrus seedlings were well colonized by the three AM fungi. Mycorrhizal fungus
inoculation improved plant biomass regardless of soil-water status but decreased the
concentrations of hot water-extractable and hydrolyzable carbohydrates of soils. Mycorrhizal
soils exhibited higher Bradford-reactive soil protein concentrations than non-mycorrhizal soils.
Mycorrhizas enhanced >2 mm, 1-2 mm and >0.25 mm water-stable aggregate fractions but reduced
0.25-0.5 mm water-stable aggregates. Peroxidase activity was higher in AM than in non-AM soils
whether drought stressed or not, whereas catalase activity was lower in AM than non-AM soils.
Drought stress and AM fungus inoculation did not affect polyphenol oxidase activity of soils. A
positive correlation between the Bradford-reactive soil protein concentrations, soil hyphal
length densities, and water-stable aggregates (only >2 mm, 1-2 mm and >0.25 mm) suggests
beneficial effects of the AM symbiosis on soil structure. It concluded that AM fungus
colonization enhanced plant growth under drought stress indirectly through affecting the soil
moisture retention via glomalin's effect on soil water-stable aggregates, although direct mineral
nutritional effects could not be excluded. (C) 2007 Elsevier Masson SAS. All rights reserved. |