TTE159

“EVALUACIÓN DE UN CONSORCIO DE HONGOS PROMOTORES DEL CRECIMIENTO

COMO ESTRATEGIA PARA MITIGAR EL DÉFICIT HÍDRICO EN VID ( Vitis vinifera L.) CV.

CHARDONNAY”

“Evaluation of a fungus consortium as strategy to mitigate the water defici t in Chardonnay

grapevine ( Vitis vinifera L.)”

Raúl Andrés Crouchett Rojas (1)

1) Alumno tesista, Universidad Católica de Temuco. E-mail: rcrouchett2013@alu.uct.cl

ABSTRACT

Drought is one of the main problems derived from climate change. In this context, the vineyard production

has been negatively affected in many areas worldwide. In this study a consortium of fungal strains of

Aspergillus niger , Microdochium bolleyi and Westerdykella centenaria were tested to evaluate their effect

in both alleviating water stress and promoting carbon assimilation in Chardonnay grapevine. Fugal strains

were previously isolated from a rhizospheric soil of endemic Baccharis scandens and Solanum chilense

plants from the Atacama Desert. A two-level factorial experiment was applied on 32 two-year-old pot

grown plants in outdoor condition with fungus inoculation and deficit irrigation as factors. In leaves, net

photosynthesis ( A N ), stomatal conductance, substomatal carbon concentration, intrinsic water use

efficiency, leaf water potential ( Ψ L ) and SPAD units were evaluated. Two-way ANOVA and t-student test

(P ≤ 0.05) were used for statistical analyses. Results showed that gas exchange variables and Ψ L were

affected exclusively by deficit irrigation. On the other hand, SPAD units showed to be effected by both

factors. When the effect of inoculum was analyzed inside of irrigation treatment, the A N increased by

18.3% under full irrigation. Findings suggest that the inoculated fungus promoted leaf carbon assimilation

of Chardonnay grapevine when soil water availability was not limiting, probably due to enhanced

chlorophyll content as SPAD values also increased. Further research is needed to clarify if nutritional

traits of soils are effectively enhanced by the inoculated consortium.

Key words: photosynthesis, stomatal conductance, leaf water potential, water use efficiency, growth

promoting fungi.

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