3rd International Congress on Recent Innovations in Engineering, Science and Technology - Istanbul - Turkey (2022-06-24)

Water relations study of Iranian genotypes of Damask rose under in vitro water deficit

Rosa damascena Mill. is one of the oldest and most valuable varieties that tolerates water deficiency somehow. However, the selection and identification of genotypes that are more tolerant to drought stress will be effective in development of cultivation of the plant. In this case, an experiment was performed under in vitro conditions using polyethylene glycol in five levels (0, 25, 50, 75 and 100 g L-1) on four genotypes of Iranian Damask roes (Maragheh, Urmia, Pakdasht and Kashan) and the tolerance of genotypes to drought stress was measured based on water relations traits of the plant by response surface method (RSM). Changes in dry matter percentage in three genotypes of 'Maragheh, Urmia and Kashan in comparison with controls increased as well as increasing stress level except for ‘Pakdasht’ which showed a decrease in dry matter percentage. Maragheh genotype with high levels of total chlorophyll, chl a and chl b and also reducing in the number of leaves and height with maintaining anabolic activities, compared to the other three genotypes showed a better safety mechanism against drought stress. Carotenoids contents in Urmia and Maragheh genotypes were higher in 100 g L-1 PEG than other genotypes. Maragheh genotype having the highest fresh and dry weight in severe drought stress was one of the most desirable genotypes compared to other genotypes. With increasing in stress intensity, leaf water content in Maragheh, Kashan and Urmia genotypes decreased. Maragheh genotype with high values of relative leaf water content, on the other hand, with a decrease in water moisture reduction, relative water loss, saturated water deficiency, showed a better protection mechanism against drought stress than the other three genotypes. Also, at level of 75 g L-1 polyethylene glycol Pakdasht genotype had the optimum withstands against drought stress.
Mrs. sara rezaei, Mrs. hanifeh seyed hajizadeh, Mrs. sahar azizi