Assessment of in vitro growth of apical stem sections and adventitious organogenesis to evaluate salinity tolerance in cultivated tomato |
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Authors: | Mercado José A Sancho-Carrascosa María A Jiménez-Bermúdez Silvia Perán-Quesada Rosa Pliego-Alfaro Fernando Quesada Miguel A |
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Institution: | (1) Departamento de Biología Vegetal, Facultad de Ciencias, Campus de Teatinos s/n, 29071 Málaga, Spain;(2) Centro de Investigación y Formación Agraria, Finca Cortijo de La Cruz s/n, 29140 Churriana, Málaga, Spain |
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Abstract: | The possible use of in vitro shoot morphogenesis and shoot apex culture to evaluate salt tolerance in cultivated tomato (Lycopersicon esculentum Mill.) has been analyzed, using two cultivars with similar salt tolerance, Pera and Hellfrucht frühstamm (HF). The effect
of salt on shoot regeneration was studied by culturing leaf explants on media supplemented with 0, 43, 86, 129 and 172 mM
NaCl. The presence of NaCl in the regeneration media at 86 mM strongly inhibited shoot regeneration in the cultivar HF, but
not in Pera. However, the substitution of NaCl by mannitol, maintaining the same water potential in the culture media, decreased
the regeneration percentage in Pera but did not affect HF. Shoot apices of both cultivars were also subcultured at 6-week
intervals, for 4 subcultures, at the same NaCl concentrations as used in the previous experiment, and the shoot growth, leaf
and root number, rooted shoot and shoot necrosis were recorded at the end of each subculture. Root formation was the parameter
most affected by salt in both cultivars, Pera being more sensitive than HF. The substitution of NaCl by mannitol significantly
increased the percentage of rooted shoots in Pera after four subcultures, and slightly decreased this percentage in HF. Shoot
necrosis was only observed in the last subculture at NaCl higher than 86 mM, the percentage of necrotic shoots being higher
in Pera than in HF (75% and 45%, respectively). The lack of agreement between the results obtained with the in vitro tests, e.g., adventitious shoot formation and growth of apical stem sections, suggests that this approach may not be a reliable
tool to evaluate salt tolerance in cultivated tomato.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | adventitious organ formation in vitro culture Lycopersicon esculentum mannitol sodium chloride |
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