Archives of Biological Sciences 2017 Volume 69, Issue 1, Pages: 119-127
https://doi.org/10.2298/ABS160202085S
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Response of Virginia (flue-cured) tobacco genotypes to water-deficit stress
Shtereva Lydia (Bulgarian Academy of Sciences, Institute of Plant Physiology and Genetics, Sofia, Bulgaria)
Stoimenova Elisaveta (Bulgarian Academy of Sciences, Institute of Plant Physiology and Genetics, Sofia, Bulgaria)
Drumeva-Yoncheva Marina (Tobacco and Tobacco Products Institute, Plovdiv, Bulgaria)
Michailova Bistra (Bulgarian Academy of Sciences, Institute of Plant Physiology and Genetics, Sofia, Bulgaria)
Kartzeva Tanja (Bulgarian Academy of Sciences, Institute of Plant Physiology and Genetics, Sofia, Bulgaria)
Ivanova Vassilevska-Roumiana (Bulgarian Academy of Sciences, Institute of Plant Physiology and Genetics, Sofia, Bulgaria)
The effect of prolonged water deficit on four Virginia (flue-cured) tobacco
genotypes, Line 842, Oxford 207, RG11 and Virgin D, was analyzed in whole
plants. Drought stress was induced by withholding irrigation and subjecting
plants to low, moderate and severe regimes. Some growth indices such as fresh
weight, plant growth rate, number, color and area of new developed leaves, as
well as proline, hydrogen peroxide (H2O2) and malondialdehyde (MDA) content
as a measure of oxidative stress were investigated to examine the role of
genotype in water-deficit tolerance. Under stress, the weight of the
aboveground parts of plants, plant growth height, number of new developed
leaves and leaf area index decreased with the severity of treatment. The
stressed plants accumulated more proline, malonildialdehide and hydrogen
peroxide than control non-stressed plants under water-deficit conditions. The
results showed that among the genotypes, Virgin D (VD) was the most sensitive
to drought, while L 842 and Oxford 207 were moderately tolerant; RG11 was
drought-tolerant. This suggests that the correlation between the
physiological traits and level of antioxidative response exists and therefore
it could be used as a rapid screening test to evaluate the drought tolerance
of tobacco.
Keywords: tobacco plant, drought stress, proline, hydrogen peroxide, lipid peroxidation