Effect of drought Stress on some Morphological and Physiological Characteristics of tow resistance and sensitivewheatcultivars
Samaneh Adl, Nahid Masoudian, Bostan Roodi, Mostafa Ebadi, Mohammad Hasan Khajeh Zadeh
1266
ABSTRACT
Water stress is one of the main abiotic stresses that reduce plant
growth;this decrease is due to changes such as physiological changes and causes
growth and production limitation that caused by drought stress.In order to
evaluate the effects of drought stress on some morphological and physiological
characteristics of tow wheat cultivars, a factorial experiment based on
completely randomized design was conducted. The findings show that drought
stress exacerbations result in the plant's response to stress due to increased
wheat resistance. This response is due to changes in plant pigments, proline,
catalase, ascorbate peroxidase, peroxidase, superoxide dismutase and
malondialdehyde, glucose, galactose, rhamnose and xylose, which ultimately
influence these changes effects on the morphological characteristics of wheat.Drought
stress reduces the concentration of carotenoids, chlorophyll a, chlorophyll b,
total chlorophylls, but glucose, galactose, rhamnose, xylose, proline,
catalase, ascorbate peroxidase, peroxidase, superoxide dismutase,
malondialdehyde (in leaves and roots) and the chlorophyll a and b ratios were
increased.Reduction of plant height, stem height, root length, fresh and dry
weight of wheat treated with 250 g / l PEG compared to non-treatment were
0.264, 0.236, 0.394, 0.183 and 0.395, respectively.From the two wheat
cultivars, the morphological characteristics of the N8720 increased compared to
the Gonbad cultivar. Interaction effects of cultivar and drought stress showed
that N8720 cultivar without treatment had the highest morphological
characteristics, carotenoid concentration, chlorophyll a, chlorophyll b, total
chlorophylls a and b, and the above cultivar with 250 g / l PEG (drought
stress) had the highest amount of proline, malondialdehyde, soluble sugars and
enzymes in leaves and roots. Increasing activity of oxidative enzymes and
soluble sugars in wheat under drought stress could be a sign of their relative
tolerance to drought stress.
Keywords: Drought stress, N8720,
photosynthetic pigments, enzymes
ABSTRACT
Water stress is one of the main abiotic stresses that reduce plant
growth;this decrease is due to changes such as physiological changes and causes
growth and production limitation that caused by drought stress.In order to
evaluate the effects of drought stress on some morphological and physiological
characteristics of tow wheat cultivars, a factorial experiment based on
completely randomized design was conducted. The findings show that drought
stress exacerbations result in the plant's response to stress due to increased
wheat resistance. This response is due to changes in plant pigments, proline,
catalase, ascorbate peroxidase, peroxidase, superoxide dismutase and
malondialdehyde, glucose, galactose, rhamnose and xylose, which ultimately
influence these changes effects on the morphological characteristics of wheat.Drought
stress reduces the concentration of carotenoids, chlorophyll a, chlorophyll b,
total chlorophylls, but glucose, galactose, rhamnose, xylose, proline,
catalase, ascorbate peroxidase, peroxidase, superoxide dismutase,
malondialdehyde (in leaves and roots) and the chlorophyll a and b ratios were
increased.Reduction of plant height, stem height, root length, fresh and dry
weight of wheat treated with 250 g / l PEG compared to non-treatment were
0.264, 0.236, 0.394, 0.183 and 0.395, respectively.From the two wheat
cultivars, the morphological characteristics of the N8720 increased compared to
the Gonbad cultivar. Interaction effects of cultivar and drought stress showed
that N8720 cultivar without treatment had the highest morphological
characteristics, carotenoid concentration, chlorophyll a, chlorophyll b, total
chlorophylls a and b, and the above cultivar with 250 g / l PEG (drought
stress) had the highest amount of proline, malondialdehyde, soluble sugars and
enzymes in leaves and roots. Increasing activity of oxidative enzymes and
soluble sugars in wheat under drought stress could be a sign of their relative
tolerance to drought stress.
Keywords: Drought stress, N8720,
photosynthetic pigments, enzymes