Correlation Between the Carbon Isotope Composition (zigma513C) of Puccinellia ciliata and Balansa Clover in Duel Stresses of Waterlogging and Salinity (NaCl)

Theoretically, plants growing under stress conditions, such as in saline or waterlogged conditions, should behave with 13co2 discrimination and have different <513c values. therefore, this experiment was conducted to evaluate the effect of factors such as salinity and hypoxia in affecting delta values of puccinellia ciliata and balansa clover {trifolium michelianum savi. var balansae boiss). this study reveals that these two species (c3 plants) behave differently and b. clover has more positive <$13c values (7.6%) compared to p. ciliata. the overall average of 6l3c were -28.85 and -26.66 °/oo. respectively, for p. ciliata and b. clover. the <513c values for the shoots and roots of the two species also have different values (more positive values in roots compared to shoots). waterlogging and salinity have a significant affect on 13co2 discrimination and, statistically, these effects on <513c values are significant (p < 0.001). this means that environmental factors, such as salinity and waterlogging, create a situation for plants in which the discriminate rate against <513c would be changed (less discrimination for hypoxia and more for salinity conditions). the combined effects on species and plant parts of waterlogging and salinity are not statistically insignificant on 613c values, however, each factor separately has a significant effect on <513c values. p. ciliata was grown in different seasons (summer and winter) and showed significant differences in s13c values (by almost 4%). the carbon content (%) of the two species was different, but, were not related to <513c, respectively.