Resumo

CASIERRA-POSADA, Fánor  e  RODRIGUEZ, Sandra Yaqueline. Tolerance of pineapple guava plants (Acca sellowiana [Berg] Burret) to NaCl salinity. Agron. colomb. [online]. 2006, vol.24, n.2, pp.258-265. ISSN 0120-9965.

The effects of NaCl salinity on the biomass production and partitioning, water uptake and total leaf area were investigated in pineapple guava (Acca sellowiana [Berg] Burret) plants grown in pots with soil under greenhouse conditions during eight months. Salt treatments started 60 days after planting. Sodium chloride was added to the soil in different concentrations of 0, 20, 40, 60, or 80 mM NaCl. These concentrations contributed to electrical conductivities of 2.8, 4.6, 6.1, 8.4, or 11.1 dS· m-1, respectively. In order to avoid osmotic shock, saline treatment was imposed incrementally, increasing the salt concentration every week until the final concentration was reached. Pots were irrigated two times a week and the water excess was avoided. Increasing salinity had little or no influence on biomass production and partitioning, but reduced evapotranspiration of plants. Water lost through evapotranspiration during this study was markedly reduced as salinity was increased in soil. The results suggested that pineapple guava plants had tolerance to NaCl salinity under greenhouse conditions.

Palavras-chave : salt stress; leaf area; dry matter partitioning.

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