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Allahgholipour M.,Rice Research Institute of Iran RRII | Farshdfar E.,Razi University | Rabiei B.,Guilan University
Genetika | Year: 2015

This study was conducted to determine the combining ability and heritability of rice grain yield, its components and some grain quality traits such as amylose content (AC), gelatinization temperature (GT), gel consistency (GC) and head rice recovery (HRR). The study was commenced by crossing the selected rice varieties based on a full diallel mating design. The F1 was harvested at the end of the season. In the following season, the crossed, reciprocal and parental lines were planted in randomly complete block design with three replications. Analysis of variance indicated that genotypes were significantly different for all traits. The diallel analysis by Griffing's method showed highly significant differences for GCA for number of panicles per plant (PN), amylose content, gelatinization temperature and head rice recovery. Highly significant differences were also observed for both SCA and REC for all evaluated characters. The results showed that the grain yield (GY), number of filled grains (FGN), 100-grain weight (HGW) and GC were controlled by non-additive gene action, while the inheritance of PN, AC, GT and HRR were largely controlled by additive gene effects, although nonadditive genetic components and reciprocal effect were also involved, which suggest that a selection process could be done in the early generations. The two improved lines (RI18442-1 and RI18430-46) were found to be good general combiners for GY and FGN, while the best combiners for PN was Tarom Mohali and IR50 and for HGW was RI18430-46. The best combinations for GY were RI18430-46 × IR50, Tarom Mohali × RI18447-2 and Daylamani × RI18430-46. The good hybrids were Tarom Mohali × IR50, Line23 × RI18447-2 and Line23 × Backcross line for AC. Narrow sense heritability showed that the GY and GC had the lowest values while the other traits had either moderate or high heritability, which indicates selection in the early generations could be done to fix the favorable genes. In present study, narrow sense heritability was high for AC and moderate for GT, PN and HRR.

Alizadeh M.,Rice Research Institute of Iran RRII | Minaei S.,University of Tehran
Journal of Food Process Engineering | Year: 2012

One of the specific traits of Iran's local paddy varieties is the presence of awns at the tip of the lemma that cause difficulties in the grain flow through chutes and orifices. In this study, the effect of de-awning and moisture content of paddy on the angle of repose, coefficient of internal friction and coefficient of mobility were evaluated as a function of moisture content in the range of 7-23% dry basis (d.b.). Results revealed that the effect of de-awning and moisture content on frictional properties of paddy was highly significant (P < 0.01). For awned paddy, the angle of repose increased from 37.42 to 45.70°; coefficient of internal friction increased from 0.453 to 0.574; the angle of internal friction from 24.37 to 29.85° and coefficient of mobility decreased from 0.415 to 0.335 as the paddy moisture content increased from 7.64 to 23.38% d.b. In the case of de-awned paddy, the angle of repose increased from 34.46 to 42.68°; coefficient of internal friction from 0.427 to 0.512; the angle of internal friction from 23.11 to 27.10° and the coefficient of mobility decreased from 0.430 to 0.370 at same range of moisture content. PRACTICAL APPLICATIONS Knowledge of frictional properties is important in predicting the lateral pressure on a retaining wall in storage bins or design of bins and hoppers for gravity flow. The coefficient and angle of internal friction has applications in problems of flow of bulk granular materials encountered in problems flow of bulk granular materials equipment. To predict the flow ability of the grains through openings, it is important to determine the angle of repose of the materials. In design and optimization of paddy handling systems, especially de-awner machine, dryer, huller and cleaning systems, it is important to obtain these frictional properties during paddy postharvest operations. © 2011 Wiley Periodicals, Inc.

Alizadeh M.R.,Rice Research Institute of Iran RRII
Australian Journal of Crop Science | Year: 2011

Paddy husking operation is one of the most important stages during milling process, which effectively determines the quantitative and qualitative losses of rice. In this study, the effect of four levels of husked ratio (HR) of 0.6, 0.7, 0.8 and 0.9 on broken brown rice (BBR), broken milled rice (BMR) and rice whiteness (RW) was examined. Three common Iranian rice varieties, namely Binam, Khazar and Sepidroud were used as raw materials. A commercial rice milling system including rubber rolls husker and blade-type whitener was considered in the experiment. The results revealed that the BBR increased significantly (P<0.01) from 7.42 to 10.28%, 9.17 to 13.39% and 15.17 to 21.82% for Binam, Khazar and Sepidroud varieties, respectively as the HR increased from 0.6 to 0.9. The lowest BMR for varieties of Binam (17.83%), Khazar (23.35%) and Sepidroud (28.90%) were obtained at the HR of 0.8. By increasing the HR from 0.6 to 0.9, the RW decreased from 36.1 to 30.8, 36.5 to 30.1 and 35.4 to 29.8 for Bianm, Khazar and Sepidroud varieties.

Khosravi J.,Islamic Azad University at Tehran | Asoodar M.A.,University of Agriculture and Natural Resources Ramin | Alizadeh M.R.,Rice Research Institute of Iran RRII | Peyman M.H.,Guilan University
World Applied Sciences Journal | Year: 2011

Rice is one of the most important food resources in Iran. Considering that Iran is one of the biggest rice importers, plans need to be set to pave the way for becoming self sufficient in the production of this product. Using a suitable rice milling system with low loss and reasonable costs is very important to reach this aim. Therefore, it is necessary to select the proper rice milling system considering all the effective parameters in the efficiency of rice milling systems. For this aim a proper technical Multi-Criteria Decision Making (MCDM) was used to select the most proper rice milling system. The optimization process was accomplished using multiple criteria decision making system compensatory (TOPSIS). Several aspects, the percentage of white rice breakage, the market appeal of final production, energy consumption, the capacity of systems and system's costs were considered as rice milling attributes. Three kinds of traditional and modern rice milling systems were defined as rice milling candidate alternatives. The TOPSIS technique indicated that the percentage of white rice breakage by 0.01 score is the most important decision making factor in selecting rice milling system and system's costs with 0.88 score is a less important parameter. Although the results of TOPSIS technique showed rice milling system 3 with the highest value (0.84) was the most suitable systems. © IDOSI Publications, 2011.

Zareiforoush H.,Tarbiat Modares University | Minaei S.,Tarbiat Modares University | Alizadeh M.R.,Rice Research Institute of Iran RRII | Banakar A.,Tarbiat Modares University
Food Engineering Reviews | Year: 2015

Among the cereals, rice is the major foodstuff for a large part of the world’s population. Due to its tremendous importance in the global market, its qualitative economic aspects during processing have always been attended by producers. As the most delicate of the cereals, rice needs the utmost care during post-harvest handling and processing, because in most cases, it is consumed as whole kernel. The growing demand for production of rice with high-quality and safety standards has increased the need for its accurate, fast and objective quality monitoring. Computer vision techniques, as novel technologies, can provide an automated, nondestructive and cost-effective way to achieve these requirements. In recent years, various studies have been conducted to evaluate rice qualitative features based on computer vision techniques. This paper presents the theoretical and technical principles of computer vision for nondestructive quality assessment of rice combined with a review of the recent achievements and applications for quality inspection and monitoring of the product. © 2015, Springer Science+Business Media New York.

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