Mohammad Yazdandoost Hamedani; Mokhtar Ghobadi; Mohammad Eghbal ghobadi; Saeid Jalali Honarmand; mohsen saeidi
Abstract
In order to evaluate the effect of foliar application of some chemicals on antioxidant enzymes activity and chlorophyll fluorescence of sunflower in different irrigation conditions as well as identifying compounds’ effectiveness in reducing the adverse effects of drought stress, this experiment ...
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In order to evaluate the effect of foliar application of some chemicals on antioxidant enzymes activity and chlorophyll fluorescence of sunflower in different irrigation conditions as well as identifying compounds’ effectiveness in reducing the adverse effects of drought stress, this experiment has been conducted at the Agricultural Research Center of Hamedan, Iran, between 2015 and 2016. Three irrigation and six foliar application treatments are evaluated in a split plot experiment based on randomized complete block design with three replications. Irrigation treatments consist of 60%, 80%, and 100% plant water requirement and foliar application treatments include abscisic acid 40 μM, Selenium 20 mg/L, Salicylic acid 500 μM, SNP 100 μM, Glycine betaine 100 mM, and the control. Results show that by decreasing the irrigation water, the activity of superoxide dismutase, peroxidase, and catalase enzymes rise sharply, while the maximum photochemical efficiency of photosystem II and grain yield decline. The interaction effect of irrigation × foliar application on the activity of antioxidant enzymes and grain yield is significant, but not so on chlorophyll fluorescence. In deficit irrigation treatments, foliar application of all chemical compounds significantly boost the activity of antioxidant enzymes, compared to the control. Application of salicylic acid raises the maximum photochemical efficiency of photosystem II and grain yield, at all irrigation conditions. Under 60%, 80%, and 100% irrigation conditions, salicylic acid application increases grain yield by 24.3%, 10.1%, and 4.9%, respectively.
Mahdieh sheikhaliyan; Yousef Sohrabi; farzad Hossainpanahi; Amir Hossein Shirani rad
Abstract
In order to investigate the interaction between sodium nitroprusside and drought stress on photosynthetic pigments and their relationship with yield and yield components of rapeseed, an experiment was conducted during two cropping years (2015-16 and 2016-17) at Hamedan Agricultural and Natural Resources ...
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In order to investigate the interaction between sodium nitroprusside and drought stress on photosynthetic pigments and their relationship with yield and yield components of rapeseed, an experiment was conducted during two cropping years (2015-16 and 2016-17) at Hamedan Agricultural and Natural Resources Research Center. The experiment was carried out as a factorial in randomized complete block design with three replications. Experimental factors were irrigation levels including full irrigation (control), irrigation termination from beginning silique stage and irrigation termination from grain filling stage, and four treatments of foliar application of sodium nitroprusside with concentrations of 0, 100, 200 and 300 μM. The results showed that irrigation termination significantly reduced the amounts of studied traits. Sodium nitroprusside foliar application increased the amounts of photosynthetic pigments, yield and grain yield components under drought stress and non-stress conditions. The highest and the lowest grain yield were obtained in the combination treatments of plant foliar application with 300 mM sodium nitroprusside and full irrigation (5129 kg/ha) and non-foliar application and irrigation interruption at the beginning silique stage (3396 kg/ha), respectively. The experiment indicated that sodium nitroprusside application can have positive effects on photosynthetic pigments, yield components and grain yield of rapeseed under drought stress and non-stress conditions, and therefore its application can greatly mitigate the adverse effects of drought stress in water deficit conditions.