Morphological, Physiological and Biochemical Responses of the Peppermint Plant to Deficit Irrigation
Project no. 20168 · Status: Kapanmış (Yayın bekleniyor) · 2018
Summary
In this study, the physiological and biochemical responses of the mint species Mentha peperita L. to different levels of water stress were determined. The study was conducted according to a random block experimental design, with four different irrigation treatments, one of which was a control, and three iterations. The irrigation treatments were the control, S100, in which deficient moisture in the root zone was made up to field capacity once every five days, and treatments S25, S50 and S75, which received 25%, 50% and 75% of this amount respectively. In 2019 and 2020, seasonal evapotranspirations were 603,1 mm and 610,5 mm, and daily evapotranspiration was 6,9 mm and 7,2 mm respectively. An increase in water stress upset the balance of water conservation of the plants in S50 and more especially in S25. The same situation was seen in leaf water content. Essential oil yield is generally greater in the first year than in the second year because of the increasing amounts of green herb. Of the essential oil components, the proportion of menthone was generally found to be higher in treatments with no or little stress, the proportion of menthofuran was higher in stressed treatments, and the proportion of menthol was higher in the first cuts in the highly stressed treatments, and in the second cuts in the unstressed treatment S100. The highest lipid peroxidation was observed in treatment S25, which was highly stressed. It was not as effective in the other treatments, since CAT, POX and APX enzymes scavenged H2O2 sufficiently in the other treatments. The highest prolin accumulation was seen in the treatment with the highest water stress, S25. The highest amounts of K+ were obtained in S100, which had no water stress; the amounts were higher in the first year than in the second year.