Influence of salt stress on primary metabolism of Zea mays L. seedlings of model genotypes |
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Authors: | Y. I. Mladenova |
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Affiliation: | (1) Institute of Genetics, Bulgarian Academy of Sciences, BG-1113 Sofia, Bulgaria |
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Abstract: | Short-term studies for comparing some primary metabolic and growth-responses to salt stress in seedlings of two maize genotypes differing in drought resistance were carried out under controlled conditions. Both genotypes revealed high yielding ability in favourable environments. Treatments: Control (Hoagland-Arnon No 1 solution) and salt stress (Hoagland-Arnon solution plus NaCl, s = –0.84MPa). It was found that in both genotypes the activity of the principal metabolic pathway supplying reduced nitrogen (15N) for the synthesis of amino acids and proteins as well as the assimulatory number (14CO2—assimilation relation rate per chlorophyll unit) were decreased under the effect of the stress. These effects were more marked in the resistant genotype. In this genotype the stress induced metabolic activity decline was accompanied by a corresonding reduction of the relative growth rate. Conversely, continuing growth, resulting probably from accumulation of solutes, was observed in the susceptible genotype.On the basis of these and other observations it is assumed that the resistant genotype manifests short-term energy saving stress reactions. |
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Keywords: | growth chamber nutrient solution 15NO3 assimilation photosynthesis relative growth rate seedlings short-term NaCl stress |
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