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International
Congress Rhizosphere, Munich 2004
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Effects of arbuscular mycorrhizal fungal inoculation on root
biomass and morphology in the nursery production of camellia.
Salinero MC¹, Vela P¹, Sainz MJ²
1
Estación Fitopatolóxica do Areeiro, Excma. Diputación
Provincial de Pontevedra, Subida a la Robleda s/n, 36153 Pontevedra,
España.
2 Departamento de Producción Vegetal, Universidad de
Santiago de Compostela, Campus Universitario, 27002 Lugo, España.
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ABSTRACT: Commercial
production of camellia plants is based on the propagation of stem cuttings.
Studies carried out with other woody perennials, such as grapevine, have shown
that inoculation with arbuscular mycorrhizal fungi at the rooting stage of
cuttings can modify the morphology of the root system and, once transplanted to
pots, can lead to increase plant growth. In the present work, cuttings of
Camellia japonica cv. Latifolia and the hybrid Camellia x
williamsii cv. Debbie were prepared with a stem bearing one or two mature
leaves, and three growth buds. Two rooting beds of sterile peat:perlite were
established at the nursery: one of them was amended with inoculum of the AM
fungus Acaulospora scrobiculata, whereas the other was not
AM-inoculated. Cuttings received a basal coating of IBA and were inserted in
the rooting beds. After six months, well rooted plants were transplanted to 1.5
L pots filled with sterile peat, and allowed to grow for one year. Results
indicated that inoculation with A. scrobiculata in the rooting bed of
camellia cuttings changed root morphology, increasing the number and branching
of first order lateral roots of both cultivars. When rooted cuttings were
transplanted to pots, and grown for twelve months, the effect of AM inoculation
on root morphology was still observed, although no significant difference in
root biomass was found. AM-inoculated and uninoculated plants were similar in
above-ground size and biomass, except that fresh and dry weights of newly
formed shoots were higher in mycorrhizal plants..
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