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Insect Resistance and Horticultural Trait Genetic Values of Potato Families
Velci Queiróz de Souza,Arione da Silva Pereira,Giovani Olegário da Silva,Fernando Irajá Félix de Carvalho,Antônio Costa de Oliveira 한국작물학회 2008 Journal of crop science and biotechnology Vol.11 No.1
This work aimed to evaluate 11 potato families for insect resistance horticultural traits. The families were derived from crosses between introduced insect resistant and adapted genotypes. A randomized complete block design, with three replications was used. The plot consisted of 25 genotypes of a family, summing up to 75 genotypes tested per family. Two susceptible cultivars were included in the experiment as controls. The genotypes were evaluated for insect resistance, tuber yield traits, tuber appearance, and tuber skin smoothness. The genetic value for the intensity of insect attack in the leaves and in the tubers was lower (higher resistance) in the 11 families than in the controls. For yield traits, there was no predominant effect among the families regarding the origin of the resistant donor species (Solanum berthaultii and/or S. chacoense). However, there was a large contribution of the C-1485-16- 87 recurrent parent in crosses with resistant genotypes for tuber yield and tuber number. In relation to tuber appearance, only the family derived form the C-1485-16-87/ND140 (S. berthaultii) cross did not differ from the controls. For tuber skin smoothness, the genetic values of the families did not significantly from each other or from the controls. This work aimed to evaluate 11 potato families for insect resistance horticultural traits. The families were derived from crosses between introduced insect resistant and adapted genotypes. A randomized complete block design, with three replications was used. The plot consisted of 25 genotypes of a family, summing up to 75 genotypes tested per family. Two susceptible cultivars were included in the experiment as controls. The genotypes were evaluated for insect resistance, tuber yield traits, tuber appearance, and tuber skin smoothness. The genetic value for the intensity of insect attack in the leaves and in the tubers was lower (higher resistance) in the 11 families than in the controls. For yield traits, there was no predominant effect among the families regarding the origin of the resistant donor species (Solanum berthaultii and/or S. chacoense). However, there was a large contribution of the C-1485-16- 87 recurrent parent in crosses with resistant genotypes for tuber yield and tuber number. In relation to tuber appearance, only the family derived form the C-1485-16-87/ND140 (S. berthaultii) cross did not differ from the controls. For tuber skin smoothness, the genetic values of the families did not significantly from each other or from the controls.
AProposal for Aluminum Tolerance Selection in White Oat under Hydroponic Conditions
Maraisa Crestani,Antonio Costa de Oliveira,José Antonio Gonzalez da Silva,Elisane Weber Tessmann,Itamara Mezzalira,Fernando Irajá Félix de Carvalho 한국작물학회 2011 Journal of crop science and biotechnology Vol.14 No.1
White oat genotypes were subjected to Al stress in hydroponic conditions in order to verify the viability of methods based on minimum nutrient solution (MNS) in comparison to complete nutrient solution (CNS), commonly used in the characterization and selection for Al tolerance in this species. The experimental design was completely randomized blocks with three replicates composed of 10 seedlings each. Six white oat genotypes subjected to different Al levels in minimum (0, 3, 6, and 9 mg L-1) and complete (0, 10,20, and 30 mg L-1) solutions were evaluated. In this evaluation, the MNS was efficient in identifying aluminum-tolerant, white oat genotypes under hydroponics. The root growth resumption showed to be the most effective trait in the aluminum-tolerant plant selection. At concentrations equal to or higher than 3 mg Al L-1 in minimum and 10 mg Al L-1 in complete solution, severe damage caused by the toxic element on root development was verified. The white oat cultivars UFRGS 14, ALBASUL, and BARBARASUL showed aluminum tolerance in the tested conditions.
A note on cohomological dimension over Cohen-Macaulay rings
Iraj Bagheriyeh,Kamal Bahmanpour,Ghader Ghasemi 대한수학회 2020 대한수학회보 Vol.57 No.2
Let $(R,\m)$ be a Noetherian local Cohen-Macaulay ring and $I$ be a proper ideal of $R$. Assume that $\beta_R(I,R)$ denotes the constant value of ${\rm depth}_R(R/I^{n})$ for $n\gg0$. In this paper we introduce the new notion $\gamma_R(I,R)$ and then we prove the following inequalities: $$\beta_R(I,R)\leq\gamma_R(I,R)\leq \dim R - \cd(I,R)\leq \dim R/I.$$ Also, some applications of these inequalities will be included.
Investigation on the Creep Behavior of AZ91 Magnesium Alloy Processed by Severe Plastic Deformation
Iraj Khoubrou,Bahram Nami,Seyyed Mehdi Miresmaeili 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.2
This paper describes the grain refnement due to equal-channel angular pressing (ECAP) and the creep properties of theECAP-processed AZ91 magnesium alloy. The resulting microstructure and creep properties were examined by scanningelectron microscope and impression creep test method. Microstructural evolution reveals that the grains were refned to14 µm after four ECAP passes at 628 K, following route Bc. The creep tests were carried out under stresses in the range of35 to 95 MPa at temperatures in the range of 538 to 583 K. Based on a power law between the impression rate and stress,the stress exponents were about 2 and the activation energies were about 129 kJ/mol, which are close to that for lattice difusion of magnesium. Considering the obtained results, it can be stated that the grain boundary sliding is the dominant creepmechanism at low stresses and high temperatures.
Designing Integrated Models as a Decision Aid in Web-based Marketing
Iraj Mahdavi,Hamed Fazlollahtabar,Nezam Mahdavi-Amiri,Mohsen Kakouei 한국데이타베이스학회 2010 Journal of information technology applications & m Vol.17 No.1
Web information systems have been utilized extensively over the past decade. The Internet allows for the entire sales cycle to be conducted on one medium, nearly instantaneously. From making the consumer aware of the product to providing additional information to transacting the final purchase, the Internet can accomplish them all. The Internet is like one big point-of-sales display, with easy access to products and the ability for impulse shopping. Here, we point out different aspects of information technology (IT) in marketing. Consequently, we propose two frameworks as decision aids in web-based marketing environment.
A Novel Algorithm for Optimal Location of FACTS Devices in Power System Planning
Iraj Kheirizad,Amir Mohammadi,Mohammad Hadi Varahram 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.2
The particle swarm optimization (PSO) has been shown to converge rapidly during the initial stages of a global search, but around global optimum, the search pro~ess becomes very slow. On the other hand, the genetic algorithm is very sensitive to the initial population. In fact, the random nature of the GA operators makes the algorithm sensitive to initial population. This dependence to the initial population is in such a manner that the algorithm may not converge if the initial population is not well selected. In this paper, we have proposed a new algorithm which combines PSO and GA in such a way that the new algorithm is more effective and efficient and can find the optimal solution more accurately and with less computational time. Optimal location of SVC using this hybrid PSO-GA algorithm is found. We have also found the optimal place of SVC using GA and PSO separately and have compared the results. It has been shown that the new algorithm is more effective and efficient. An IEEE 68 bus test system is used for simulation.
Route Selection in a Dynamic Multi-Agent Multilayer Electronic Supply Network
Iraj Mahdavi,Hamed Fazlollahtabar,S. Hosna Shafieian,Nezam Mahdavi-Amiri 한국데이타베이스학회 2010 Journal of information technology applications & m Vol.17 No.1
We develop an intelligent information system in a multilayer electronic supply chain network. Using the internet for supply chain management (SCM) is a key interest for contemporary managers and researchers. It has been realized that the internet can facilitate SCM by making real time information available and enabling collaboration between trading partners. Here, we propose a multi-agent system to analyze the performance of the elements of a supply network based on the attributes of the information flow. Each layer consists of elements which are differentiated by their performance throughout the supply network. The proposed agents measure and record the performance flow of elements considering their web interactions for a dynamic route selection. A dynamic programming approach is applied to determine the optimal route for a customer in the end-user layer.