جستجوی مقالات مرتبط با کلیدواژه « stomata conductance » در نشریات گروه « زیست شناسی »

Selenium (Se) is an essential element for human and livestock health with antioxidant and anticancer effect. Although Se is not an essential element for plant growth,but improve the plant growth. A hydroponic experiment was conducted in the greenhouse of Isfahan University of Technology in winter of 1391. The completely randomized design was arranged. Se in four concentration 0, 2.5, 5 and 10 µM and Nano-Se in0,1, 4, 8 and 12 mM was added to nutrient solution. The results showed that Se improved stem diameter, fresh weight of shoot, chlorophyll content and phenol. Nano-Se improved root volume, fresh weight of root, relative water content of shoot, internal stomata CO2, and leaf temperature and mesophyll conductance. Se and Nano-Se were effective in 10 and 4 µM, respectively.Root volume increased in 8 µM Nano-Se by 72.4%. Chlorophyll content increasd by 73% in 10 µM Se. N-Se was more effective than Se on mesophyll conductance and increased in 4 µM Nano-Se by 9.9%. Conclusively, Nano-Se and Se in 10 and 4 µM was more effective respectively on most vegetative,antioxidant and photosynthetic activity of tomato.

Castor is normally cultivated in marginal lands, in arid and semiarid climates in which its oil is commonly used in industry and medicine. For investigation of physiological responses in different castor ecotypes under different water deficit conditions, the field experiment was conducted in two locations of Isfahan and Shahrekord in year 2013. The experiment was carried out in split plot arrangement in randomized complete block design (RCBD) with three replications, that included four drought stress levels of 30, 45, 60 and 75 percent moisture depletion in soil as main plot and six castor ecotypes of Esfahan, Ardesrtan, Arak, Naeen, Yazd and Ahvaz as subplot in two locations separately. The results from both experiments were analyzed by combined analysis. The measured traits included total biomass, total chlorophyll, stomata conductance, PAR absorbed by crop canopy (PAR1), absorbed radiation to total radiation and light extinction coefficient. The results showed that the highest chlorophyll is 128.6 SPAD in Yazd ecotype in Isfahan region under control and the lowest one is 25.8 SPAD in Yazd ecotype in Shahrekord under severe stress. The highest stomata conductance and light extinction coefficient are 647.5 Mmol/m2s in Ardestan and Yazd (1.03) in Shahrekord under control and the lowest ones are 53.5 Mmol/m2s in Ahvaz and 0.07 in Naein in Shahrekord region under severe stress. Under severe drought condition, absorption of photosynthetically active radiation decreased by plant canopy, stomata closed and total chlorophyll also reduced, therefore, photosynthesis rate reduced and biomass production significantly reduced compared to non-stress condition. Castor in Isfahan region produced higher biomass. While ecotypes, despite the differences in physiological responses, showed no difference in biomass.

Application of plant growth promoting rhizobacteria and foliar application of Nano-Zinc oxide are proper and cheap method for increasing of Triticale yield. So، in order to study of the effects of nano-zinc oxide and seed inoculation with plant growth promoting rhizobacteria (PGPR) on contribution of dry matter remobilization and stem reserves in grain yield، chlorophyll content، stomata conductance and some physiological indices of Triticale، a factorial experiment was conducted based on randomized complete block design with three replications in research greenhouse of the Faculty of Agriculture، University of Mohaghegh Ardabili in 2013. Factors were: foliar application of Nano-Zinc oxide at five levels (0 as control، 0. 25، 0. 5، 0. 75 and 1 g/lit) and seed inoculation with plant growth promoting rhizobacteria in four levels (without inoculation as control، seed inoculation with Azotobacter chrocoococum strain 5، Azosprillium lipoferum strain OF and Psedomunas putida strain 9). The highest contribution of dry matter remobilization and stem reserves in grain yield was obtained at no application of Nano-Zinc oxide and no seed inoculation with PGPR. Means comparison showed that maximum of yield and yield components، chlorophyll content، stomata conductance، total dry matter and crop growth rate was obtained at application of 1 g/lit Nano-Zinc oxide×seed inoculation with Azotobacter and Azosprillium and minimum of they were recorded at no application of Nano-Zinc and no seed inoculation with PGPR. So، it can be suggested that in order to increasing of grain yield، chlorophyll content، stomata conductance and some physiological indices such as total dry matter and crop growth rate be applied seed inoculation of Triticale with Azotobacter and Azosprillium ×application of 1 g/lit Nano-Zinc oxide.