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RISS 인기검색어
- 검색키워드
- 저자 : Estakhr, Afshar (검색결과 5 건)
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Estakhr, Afshar,Heidari, Bahram 한국작물학회 2012 Journal of crop science and biotechnology Vol.15 No.3
Combining ability information is necessary for selection of suitable advanced lines for hybridization and identification of promising hybrids for development of improved varieties. A number of 14 maize (Zea mays L.) inbred lines and 91 related crosses were evaluated over two years, 2008 and 2009, in a temperate-zone of Iran. The objectives of the study were to identify the best general and specific combiners, heterosis and type of gene actions responsible for agronomic traits. Except for grain yield and growing degree day to milky, significant general (GCA) and specific (SCA) combining ability were observed for all traits. The Baker ratio for plant height (0.15), ear height (0.26), growing degree day to milky stage (0.04), and grain yield (0.002) showed the predominance of non-additive gene effects in the expression of these traits. The heterosis observed for grain yield, grain number, pollination period, ear and plant height was considerably higher than that observed for other traits. The correlations (r) of $F_1$ means and SCA effects were positive and significantly higher than that of r ($F_1$, mid-parents) and r ($F_1$, heterosis) for all the traits except cob percent, growing degree days to silking, and physiological maturity. MO17, K3547/5, and K3615/2 had negative GCA effects for growing degree day to milky stage and maturity. Among hybrids, MO17 ${\times}$ K3653/2, B73 ${\times}$ K3651/2, and K3545/6 ${\times}$ K3493/1 with positive SCAs for pollination period and grain yield had also negative SCA effects for degree day to silking and milky stages. Therefore, the use of these inbred lines and hybrids increases the response to selection for increasing grain yield and early maturity in maize.
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( Hassan Estakhr ),( Gholam Reza Shahafv ) 국제태권도학회 2017 International Symposium for Taekwondo Studies Vol.2017 No.-
Purpose: The purpose of this study was to determine the effect of eight weeks plyometric and resistance training on agility, speed, and explosive power in well-trained male Tae kwondo players. Methods: The present study is a semi-experimental and practical study. Thirty well-trained male Taekwondo athletes (aged 13-20 yr) participated in the study. They were assigned in training (n = 15) and control group (n = 15) randomly. The training group engaged in a combination of plyometric and resistance training for eight weeks (3 times/wk, 90 minutes/session). Results: The results showed a significant effect of a combination of plyometric and resis tance training on agility, speed, and explosive power (p<0/05) in well-trained male Tae kwondo athletes from the Fars Province in Iran. Conclusions: These findings indicate that well-trained male Taekwondo athletes will achieve a high level of agility, speed, and explosive power with a combination of plyometric and resistance training.
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Afshar. Estakhr,Bahram. Heidari 한국작물학회 2012 Journal of crop science and biotechnology Vol.15 No.3
Combining ability information is necessary for selection of suitable advanced lines for hybridization and identification of promising hybrids for development of improved varieties. A number of 14 maize (Zea mays L.) inbred lines and 91 related crosses were evaluated over two years, 2008 and 2009, in a temperate-zone of Iran. The objectives of the study were to identify the best general and specific combiners, heterosis and type of gene actions responsible for agronomic traits. Except for grain yield and growing degree day to milky, significant general (GCA) and specific (SCA) combining ability were observed for all traits. The Baker ratio for plant height (0.15), ear height (0.26), growing degree day to milky stage (0.04), and grain yield (0.002) showed the predominance of non-additive gene effects in the expression of these traits. The heterosis observed for grain yield, grain number, pollination period,ear and plant height was considerably higher than that observed for other traits. The correlations (r) of F1 means and SCA effects were positive and significantly higher than that of r (F1, mid-parents) and r (F1, heterosis) for all the traits except cob percent, growing degree days to silking, and physiological maturity. MO17, K3547/5, and K3615/2 had negative GCA effects for growing degree day to milky stage and maturity. Among hybrids, MO17 × K3653/2, B73 × K3651/2, and K3545/6 × K3493/1 with positive SCAs for pollination period and grain yield had also negative SCA effects for degree day to silking and milky stages. Therefore, the use of these inbred lines and hybrids increases the response to selection for increasing grain yield and early maturity in maize.
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Investigation forMaize Inbred Lines Resistance to Maize Rough Dwarf Virus(MRDV)
Afshar. Estakhr,Bahram. Heidari,Ali Dadkhodaie,Mahmood Masoumi,Hassan Pakniyat,Zahra Ahmadi 한국작물학회 2016 Journal of crop science and biotechnology Vol.19 No.1
Maize rough dwarf virus (MRDV) is the most important disease affecting maize growth in Iran. In the present study, the putative resistance capacity of 35 maize inbred lines against the causal agents of MRDVwas studied under natural field infection in 2010 and 2011. The viral transmitter was a plant hopper known as Laodelphax steriatellus. Early sowing provided suitable temperatures for vector propagation and transmission and therefore natural infection under field conditions. Sowing single rows of SC704 as vector spreader between every five rows of inbred lines caused adequate vector propagation and viral transmission. This shows that viral infection was sufficient and possible resistance was linked to viral resistance, not failure, in vector transmission. In principal component biplot, plant height vector had wide angles with the vectors for disease severity index and MRDV incidence that showed the negative association of plant height with MRDV disease. The percentage of natural infection to MRDV in susceptible control(SC704) was about 64%. The genotypes A679, K3547/3, K3545/6, K3653/2, and B84 were more susceptible to MRDV. Only the line K3640/3 had low disease incidence and severity and it can be considered as resistant for possible use in genetic studies. Results showed that an early sowing of maize in temperate regions increases the chance of transmitting viruses via their vector.
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( Hassan Estakhr ),( Ebrahim Ghiyasi ),( Nilofar Arabpour ) 국제태권도학회 2017 International Symposium for Taekwondo Studies Vol.2017 No.-
Purpose: The purpose of this study was to determine the effect of eight weeks of aerobic training on the pulmonary function of professional Taekwondo players. Methods: The present study is a semi-experimental and practical study. Twenty well-trained male Taekwondo athletes participated in the study. They performed eight weeks (3 times/wk, 30 min/session) of aerobic training on a treadmill with 40-60 percent of the max imum oxygen uptake (VO2 max). Forced expiratory volume in one second (FEV1), forced vital capacity (FVC), and maximum voluntary ventilation (MVV) were measured. Results: The results showed aerobic training had significant effect on forced expiratory vol ume in one second, forced vital capacity, and maximum voluntary ventilation (p<0.05) of well-trained male Taekwondo athletes from the Fars Province in Iran. Conclusions: These findings indicate that well-trained male Taekwondo athletes will achieve a high level of pulmonary function through aerobic training.
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