جستجوی مقالات مرتبط با کلیدواژه « root » در نشریات گروه « منابع طبیعی »

In order to study the effect of auxin hormone priming on seed germination indices and seedling growth of triticale under salt stress, an experiment was carried out as a factorial experiment in a completely randomized design with four replications in seed science and technology laboratory of plant production and genetics engineering department of Agriculture Sciences and Natural Resources University of Khuzestan in 2018. Experimental factors were auxin hormone priming (control (no priming), 5 μM auxin in 3 hours, 10 μM auxin in 3 hours, 20 μM auxin in 3 hours, 40 μM auxin in 3 hours, 5 μM auxin in 6 hours, 10 μM auxin in 6 hours, 20 μM auxin in 6 hours and 40 μM auxin in 6 hours) and different salinity levels (include 0, 4, 8, 12, 16 and 20 dS/m). The analysis of variance showed that the effect of priming, salinity stress and the interaction effect of them were significant on all measured traits (except germination percetage) in 1 percent probability level. The comparison of means showed that salinity stress decreased germination traits but hormone priming reduced the negative effect of salinity stress and improved different germination indices. Also, the best concentration of Auxin hormone priming was at 20 μM for 3 hours.

Centaurea balsamita is an annual plant that invades fallow and steep lands. . In this regard, in order to evaluate the effect of intermittent temperatures on germination of Centaurea balsamita, a completely randomized design with six replications in vitro was conducted in the Faculty of Agriculture, Ferdowsi University of Mashhad. Temperature treatments were alternating day / night 15-5, 5-20, 20-10, 25-10, 25-15 and C° 30-15. The results showed that intermittent night and day temperatures showed the highest germination rate at 5-15 °C. The highest percentage and rate of germination (83% and 8.9 seeds/day) were in the intermittent temperature of 5-15 °C and the lowest in the intermittent temperature of 15-30 °C. The highest values of root length (97 mm), shoot length (30 mm), root fresh weight (19 mg) and shoot fresh weight (52 mg) were obtained at 15-30, 5-15 °C, respectively. Also, the highest value of the seedling vigor index (7.75) was related to the temperature treatment of 5-15 °C, its lowest value (5.2) at an intermittent temperature of 10-25 °C. Also, the results of this experiment were in agreement with the reality of the germination of this plant (germination in November with moisture condition). Based on the results of the present study considering that November is the peak time for the emergence of this weed in Mashhad, it is suggested that in order to perform better control and reduce the use of pesticides and consequently reduce financial and environmental costs, chemical control this weed is done at this time.

Naked oat (Avena sativa L.) is an important cereal in temperate regions. In order to investigate the effect of seeds coating with amylose and agar on germination and physiological indices of naked oats in alkali stress, a factorial experiment was conducted in a randomized complete block design. The factors used in this study included different methods of coating the seeds (non-coating, agar coating and amylose coating), different levels of alkaline stress with sodium carbonate and sodium bicarbonate ratio of 9 to 1 (values of 0-90 mM, respectively with pH 6- 10) and for 7 days in petri dish and 20 days in the pot, respectively. Seed germination ability, amylase activity, germination speed, growth, mineral and chlorophyll a and b content were evaluated. The results of this study showed that the coating of seeds plays an important role in increasing plant resistance in environmental stresses such as alkali tension. Amylose and agar are available and inexpensive materials used in this study to cover oat dextrose seeds and reduce the effect of alkaline stress and improve plant growth ability (viability), amylase activity, germination rate, plant growth, avoidance Chlorophyll decomposition and reduction of mineral absorption were in alkaline stress. Amyloid cover was better suited for seeding under normal conditions and alkaline stress but the coating was more suitable for preserving the ability to grow seed and increase seed in higher alkali concentrations.