Resumo

SALDANA, Tatiana M.; BEJARANO, Carlos A.  e  GUAQUETA, Shirley. Salinity effect on “chonto” tomato plant growth. rev.colomb.cienc.hortic. [online]. 2017, vol.11, n.2, pp.329-342. ISSN 2011-2173.  https://doi.org/10.17584/rcch.2017v11i2.7347.

Salinity stress is an important constraint in agriculture because of the reduction in crop yields and damage to substrates resulting from salt accumulation. In this study, we evaluated the effect of four NaCl concentrations (0, 50, 100 and 150 mg L-1) on the growth of two tomato hybrids, Aslam and Calima, using a growth analysis under greenhouse conditions. The dry weight of each plant organ and the leaf area were measured, and the relative growth rate, net assimilation rate (NAR), absolute growth rate (AGR), leaf area ratio, fresh weight ratio and specific leaf area were calculated. The model that best represented the growth of the hybrids was a third order polynomial. ‘Calima’ accumulated a greater leaf area and a greater amount of biomass in the leaves, stems, and flowers, while ‘Aslam’ accumulated more biomass in the fruits. ‘Aslam’ was always in growth, independent of the treatment, and presented the maximum speed of increase of dry matter. ‘Calima’ presented values equal to 0 g cm-2 d-1 for the NAR, which represented a maintenance respiratory rate higher than the photosynthetic rate. For the AGR, there was no difference in the growth speed between the two varieties.

Palavras-chave : Solanum lycopersicum L.; salt tolerance; sustainable horticulture; plant growth modelling; greenhouse; yield.

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