Hamed Narimani; Raouf Seyed Sharif; Fatemeh Aghaei
Abstract
Objective: This experiment was conducted to investigate the effects of nanoparticles (Zn and Si) and putrescine on grain-filling components of wheat under salinity stress.
Methods: An experimental factorial based on a randomized complete block design with three replications was held in the research greenhouse ...
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Objective: This experiment was conducted to investigate the effects of nanoparticles (Zn and Si) and putrescine on grain-filling components of wheat under salinity stress.
Methods: An experimental factorial based on a randomized complete block design with three replications was held in the research greenhouse of the University of Mohaghegh Ardabili during 2022. Factors experimental included salinity at four levels (no application of salinity as a control, application of 40, 80 and 120 mM salinity with NaCl), nanoparticle and putrescine foliar application at eight levels (foliar application with water as a control, foliar application of 50 mg.L-1 of Si, foliar application of 1 g.L-1 of Zn, foliar application of 1 mM putrescine, foliar application of Si-Zn, foliar application of Si and putrescine, foliar application of Zn and putrescine, foliar application of Si-Zn and putrescine).
Results: The results showed that the highest grain-filling period and effective grain-filling period were obtained in nanoparticles and putrescine foliar application. This treatment combination under no salinity increased root weight and volume (48.1 and 53.03% respectively), chlorophyll index (45.75%), and grain-filling rate (20%). There was an increase of 45.34, 62.72, 40.5, 36.21 and 37.37%, respectively, in plant height, spike length, number of grains per spike, 100 grains weight and grain yield under no salinity and foliar application with nanoparticle and putrescine in compared with no foliar application under 120 mM salinity.
Conclusion: It seems that the foliar application of nanoparticles and putrescine under salinity can increase the yield of wheat by improving root characteristics and grain-filling components.
Shahram Nazari; maryam hossieni; Mehrzad Allahgholipour
Abstract
In order to investigate the effect of seed priming (pretreatment) and coating on seedling characteristics, root morphology and phenological stages of rice, a two-year experiment has been conducted in the Rice Research Institute of Iran (Rasht) between 2020 and 2021. The experiment is performed as a factorial ...
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In order to investigate the effect of seed priming (pretreatment) and coating on seedling characteristics, root morphology and phenological stages of rice, a two-year experiment has been conducted in the Rice Research Institute of Iran (Rasht) between 2020 and 2021. The experiment is performed as a factorial in a randomized complete block design with three replications. Experimental factors include two rice cultivars (Hashemi and Gohar) and the seed pretreatment of rice cultivars in seven levels, including (1) priming with calcium chloride (-1.25 MPa in 24 hours), (2) priming with potassium chloride (1.25 MPa in 24 hours), (3) priming with zinc sulfate (concentration of 0.5 mM in 12 hours), (4) hydro-priming (48 hours) + coating the seeds with calcium chloride, (5) hydro-priming (48 hours) + coating with potassium chloride, (6) hydro-priming (48 hours) + coating with zinc sulfate, and (7) hydro-priming (48 hours as control). The results show that the highest percentage and germination rate has been observed with 99.5% and 0.23 seeds per day under seed priming with potassium chloride in the Gohar cultivar, respectively. The lowest time required to achieve 90% emergence has belonged to Hasehmi and Gohar cultivars through priming with potassium chloride and calcium chloride. The highest root length (with 24.6 cm) has been observed in priming with potassium chloride in the Gohar cultivar. The highest root dry weight in Hashemi and the Gohar cultivars has been 2.14 and 4.9 g, respectively, in priming with potassium chloride. The results also show that the maximum root volume and area are obtained with 43 cm3 and 155.28 cm2 in priming with potassium chloride in Gohar cultivar, respectively. The least time required to achieve maximum tillering, 50% flowering, and physiological maturation takes place in priming treatment with calcium chloride and potassium chloride. Seed priming with potassium chloride and coating with calcium chloride have increased grain yield by 22% and 13%, respectively, compared to the control. The highest biological yield is observed in potassium chloride priming and coating with calcium chloride treatments with 5552 and 5414 kg. ha-1 in Gohar cultivar, respectively. In general, rice seed priming with calcium chloride and potassium chloride promoted plant yield by improving seedling characteristics, root system, and phenological stages.
payman abbaszadeh dahaji; Dina S. Rezaie; Abdolreza Akhgar; Ali A. Soltani
Abstract
In order to evaluate the effect of bacterial isolates on growth parameters and nutrient uptake in two varieties of maize (such as SC704 & TWC645), two experiments were separately conducted based on a completely randomized design with four replications in greenhouse of University of Vali-e-Asr in ...
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In order to evaluate the effect of bacterial isolates on growth parameters and nutrient uptake in two varieties of maize (such as SC704 & TWC645), two experiments were separately conducted based on a completely randomized design with four replications in greenhouse of University of Vali-e-Asr in 2014. The experimental treatments consist of four isolates of fluorescent Pseudomonads (P7, P15, P24 and P29) and control (without bacteria inoculation). The results showed that the inoculation with isolates P29, P15, P7, P15, P29 and p24 respectively increased shoot dry weight (42.9 %), shoot length (23.7 %), leaf area (43.6 %), chlorophyll content (15.9 %), root dry weight (49.8 %) and root mass in variety of SC704 compared to the control (no inoculation). The application of most of the examined isolates enhanced the uptake of N, P, K, Ca and Mn in variety of SC704 significantly compared to the control. The examined isolates increased the uptake of Fe, Zn, Cu and Mn in root and shoot in variety of TWC645 significantly compared to the control. The highest uptake of Zn was observed in treatment P29 which raised the uptake of Zn in root and shoot 66.2 and 41.8 respectively in variety of TWC645 in comparison with control. All isolates had significant effect on SC704 root zinc uptake and largest increase in shoot Zn uptake was related to isolate P29 with 60.2% increase compared to the control. Overall, our observations revealed that the inoculation of maize with selected isolates had effective role on the growth and uptake of nutrients in maize.