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Seed Priming Improves Enzymatic and Biochemical Performances of Rice During Seed Germination under Low and High Temperatures

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Rice science 2023年第4期30卷 335-347,I0024-I0027页

作者： Salar MONAJJEM elias soltani Ebrahim ZAINALI Masoud ESFAHANI Farshid GHADERI-FAR Maryam HOSSEINI CHALESHTORI Atefeh REZAEI Seed Science and Technology Department of AgronomyUniversity of GuilanRasht 41996-13776Iran Department of Agronomy University of TehranTehran 33916-53755Iran Department of Agronomy Gorgan University of Agricultural Sciences and Natural ResourcesGorgan 49138-15739Iran Rice Research Institute of Iran Rasht 41996-13475Iran Food and Drug Administration Guilan University of Medical ScienceRasht 41937-1311Iran

As an abiotic stress,adverse germination temperatures cause serious disruptions in physiological and biochemical processes involved in seed *** a factorial experiment,we examined the effects of different seed priming treatments on enzymatic and biochemical performances of rice seed germination under different *** of the rice genotypes(Hashemi,Sadry-domsefid,IRON-70-7053-7 and NORIN-22)was primed with hydro-hardening,KCl,CaCl2 and ascorbic acid(AsA)and without a priming agent as a control at low(15℃),optimum(25℃)and high(35℃)germination *** results showed that the enzymatic and biochemical performances of all the rice genotypes were affected by the seed priming agents,especially under the low germination *** 15℃,seed priming with AsA was found to be the best agent for the activities of amylase,α-amylase,catalase(CAT),peroxidase(POX),ascorbate peroxidase(APOX)and superoxide dismutase(SOD)as well as the content of soluble sugars in the NORIN-22 genotype,and for protease activity and soluble protein content in the IRON-70-7053-7 *** at the low germination temperature and CAT,POX and protease at the optimum and high germination temperatures were the most important enzymes in occurrence of germination potential in terms of seedling length,vigor index,normal seedling rate and germination *** the priming agents,the highest changes in normal seedling rate were observed at the low and optimum germination temperatures by AsA priming in the Hashemi and NORIN-22 genotypes,and at the high germination temperature under KCl priming in the Hashemi genotype.

关键词： antioxidant activity biochemical performance germination temperature rice seed priming

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Optical Properties of CdS/PVA Nanocomposite Films Synthesized using the Gamma-Irradiation-Induced Method

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Chinese Physics Letters 2013年第5期30卷 160-164页

作者： Alireza Kharazmi elias Saion Nastaran Faraji Nayereh soltani Arash Dehzangi Physics Department Faculty of ScienceUniversity Putra MalaysiaSerdang 43400Malaysia Institute of Microengineering and Nanoelectronics Universiti Kebangsaan MalaysiaBangi 43600Malaysia

Monodispersed spherical CdS nanoparticles embedded into polyvinyl alcohol (PVA) films are synthesized by using an in-situ gamma-irradiation-induced method. The formation mechanism of CdS nanoparticles capped by two united cells of PVA is purposed by means of surrounding the CdS nanoparticles with OH bonds of the PVA chain. CdS nanoparticles are found to possess an unusual orthorhombic structure in monoclinic crystalline PVA. The polymer matrix affords protection from agglomeration and controls the particle size. It is found that the distribution of the prepared nanoparticles increases and a narrower size distribution is observed when the gamma radiation is varied from 10 to 50 kGy. While the average size of the nanoparticles is found to be less affected by the variation of the gamma radiation doses. The size range of the synthesized nanoparticles is 14±1 nm. The optical absorption spectra of synthesized CdS nanoparticles in a polymer matrix reveal the blue shift in the band gap energy with respect to CdS bulk materials owing to quantum confinement effect. The photoluminescence study of nanocomposite films shows the green emission arising from the crystalline defects.

关键词： nanoparticles composite crystalline

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