ISHS Acta Horticulturae 589: X International Asparagus Symposium
PLUG SEEDLING GROWTH AS AFFECTED BY AM FUNGUS SYMBIOSIS IN ASPARAGUS |
| Authors: | Y. Matsubara, E. Suzumura, H. Fukui |
| Keywords: | Asparagus officinalis L., growth promotion, mycorrhiza, root ball formation, taking root |
| Abstract:
The means of symbiosis with arbuscular mycorrhizal (AM) fungi［Gigaspora margarita (GM), Glomus fasciculatum (GF) and Glomus sp. R10 (GR)］was investigated in plug seedling production in asparagus (Asparagus officinalis L., cv. Mary Washington 500W); growth medium was mixture of brown peat : vermiculite (9 : 1, v/v); number of cells per tray was 72 or 128; daily supplying 200ml of liquid fertilizer containing 5 ppm KH2PO4 per a plug tray. Seventy days after raising, growth promoting effect including increase in plant height, number of shoots and storage roots, length of storage roots and dry weight of shoots and roots occurred in AM plants with GM being most effective, irrespective of the cell size. AM fungal infection and symbiotic organ formation were recognized in all the inoculated plants and the infection level in a root system ranged from 35-43%. GM-infected plot showed higher rate in root ball formation than did non-AM plot, regardless of the cell size. In addition, storage roots in GM plot gave higher Brix than did in non-AM plot. Ten weeks after transplanting to new bed soil, dry weight of both shoots and roots became higher in GM plot than in non-AM plot, irrespective of the cell size. AM fungal infection was successively recognized and the infection level in a root system reached more than 45%. These results reveal that AM fungus symbiosis is available for obtaining vigorous seedlings within short period and enhancing initial growth of transplant in production system of plug seedlings in asparagus. | |
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