Showing 2 results for zaefarian
Roghayeh Hasanpour, Faezeh Zaefarian, Mohammad Rezvani, Bahi Jalili,
Volume 8, Issue 33 (vol. 8, no. 33, 2020 2019)
Abstract
Lead and Cadmium are toxic and common pollutants of the soil that affect plant processes, functions and sustainable production of plants. In this research, the effect of Lead and Cadmium stress on some growth parameters of water mint aromatic plant (Mentha aquatica L.) in two separate completely randomized design experiments at Sari Agricultural Sciences and Natural Resources University was studied. Experimental treatments were different concentrations of Lead (0, 125, 250, 375 and 500 mg/kg) and Cadmium (0, 5, 10, 15 and 20 mg/kg). Plant height, number of leaf, leaf area, greenness index, chlorophyll a, chlorophyll b, total chlorophyll (a+b), chlorophyll ratio (a/b) and fresh and dry weight of shoot were measured. Lead and Cadmium stress reduced plant traits except chlorophyll ratio in treatment of Lead. The minimum amount of plant traits was related to the highest concentration of lead and cadmium. The reduction of chlorophyll b was heigher than chlorophyll a with increase in level of lead, which increased chlorophyll ratio in the lead stress. Lead and Cadmium with influence on morphological traits can lead to a series of physiological changes in water mint that reduced fresh and dry weight of shoots. The results gained from the experiments showed that due to the lack of blight, chlorosis and abscission of leaves, water mint can be considered as a resistant plant to Lead and Cadmium.
Mahya Asdolahzade, Mohammad Rezvani, Faezeh Zaefarian, Hamidreza Mobaser,
Volume 11, Issue 51 (vol. 11, no. 51 2022)
Abstract
Redroot pigweed (Amaranthus retroflexus L.) is a noxious and cosmopolitan weed that is widely distributed in different parts of the world and competes severely with crops and reduces their growth and yield. The present study was conducted to investigate the effect of drought stress on some morphological and physiological characteristics of redroot pigweed in 2018 and 2019. Treatments included different degrees of drought stress with 5 levels including 100, 75, 50, 25, and 12.5% of pot water content (equivalent to no stress, light stress, moderate stress, high stress, and severe stress). Leaf number, plant height, and leaf dry weight were affected by the interaction of drought stress×years and with increasing drought stress, leaf number, plant height, and leaf dry weight decreased in both years of the experiment. With decreasing the water content of the pot, the activity of catalase and superoxide dismutase increased. The highest levels of catalase and superoxide dismutase activity (110.35 and 1433.33 units of enzyme/mg protein per minute) were observed in the second year under severe stress, respectively. Increasing the intensity of stress decreased the soluble protein content of the plant. Also, drought stress reduced plant chlorophylls a and b content, whereas, carotenoid content increased. The highest amount of carotenoids was observed in both years under severe drought stress conditions. Overall, drought stress in the second year reduced growth in redroot pigweed further but in this year, the enzyme activity ramped up further. Therefore, this plant can modify stresses and maintain its survival by changing its biochemical activity.
