Fatemeh Rashidi; Nadali Bagheri; NadAli Babaiean Jelodar; Ali Dehestani Kolagar
Abstract
Objective: considering the importance of early maturityin canola, this research was carried out in order to identify important agronomic traits related to seed yield and to early with high-yielding cultivars in Brassica genus.
Methods: The genetic materials examined in this research included 100 genotypes ...
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Objective: considering the importance of early maturityin canola, this research was carried out in order to identify important agronomic traits related to seed yield and to early with high-yielding cultivars in Brassica genus.
Methods: The genetic materials examined in this research included 100 genotypes of six species of Brassica genus (B. napus, B. juncea, B. nigra, B. rapa, B. carinata and B. oleracea) were planted in two repetitions in the form of a lattice square design in the research fields of University of Agricultural Sciences and Resources Natural Sari.
Results: The results of variance analysis showed that the studied genotypes have very significant differences with each other in terms of all agricultural traits. The results of mean comparison showed that genotypes from B. napus species has the highest yield and genotypes from B. rapa species has the shortest days to ripening with the lowest yield. The analysis of genetic correlations for all species revealed that yield of seed had a significant positive correlation with days to ripening, silique number per plant, thousand grian weight and grian number in silique. Results of stepwise regression analysis revealed that silique number per plant, 1000-grain weight, number of silique per plant and days to maturity had significantly effects on grain yield.The result of factor analysis showed three independent factors that explained 92% of the total variability, which were named ‘productivity’, ‘phenology’, and ‘thousand grian weight’, respectively.
Conclusion: According to all three factors,B. napus, best species and Janetzika,Liragold,Hayola 401andHayola 308 from B. napus species, were identified as the best cultivars concerning seed yield and early maturity.
Mahdi Motakefi; Ahmad Ghanbari; Seyyed Mohsen MoussAvi Nik; Alireza Sirousmehr
Abstract
This study was conducted to investigate the effect of organic growth Stimulator on growth and yield of rapeseed (Dalgan cultivar) under drought in university of Zabol (Chahnime) during 2017as split plot design based on RCBD with three replications. The treatments consisted of irrigation cut off levels ...
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This study was conducted to investigate the effect of organic growth Stimulator on growth and yield of rapeseed (Dalgan cultivar) under drought in university of Zabol (Chahnime) during 2017as split plot design based on RCBD with three replications. The treatments consisted of irrigation cut off levels based on the phenological growth stages (Sylvester-Bradley encoding system): I1 = control (complete irrigation), I2 = irrigation up to stage the growth rate code is 2.20 (twenty internally identified) and I3 = irrigation to stage the growth rate code is 5.9 (all pods are more than 2 cm long) and subsidiary factor consists of four levels of fertilizer : F1 = control (pure water solution), F2 = Hamoon Green 1 liter at 10 liter + calcium, F3 = Hamoon Green 1 L at 20 liter + calcium, F4 = Hamoon Green 1 liter at 30 liter + Calcium. The results showed that I2 caused a significant decrease in plant height, stem diameter, number of pods, number of seeds per pod, 1000 seed weight, grain and biological yield and oil percentage, and also F2 increased the above traits except the percentage of oil. Interaction effects showed that the highest amount of chlorophyll a, b, total, carotenoid, selenium and calcium content of grain obtained from I1F2. The highest amount of proline in I2F2 observed. The highest of these traits was obtained from F2. Generally, spraying of the organic growth stimulator can be moderates the harmful effects of drought stress in rapeseed and 27% improved seed yield.
Ali Shayanfar; Farshid Ghaderifar; Rahmatollah Behmaram; Afshin Soltani; Hamidreza Sadeghipour
Abstract
Secondary seed dormancy is known as the major reason for seed persistence of canola (Brassica napusL). Volunteer’s rapeseeds emerging from the soil seed bank can lead to unwanted gene dispersal to other plants after breaking secondary seed dormancy. At the current study, secondary dormancy was ...
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Secondary seed dormancy is known as the major reason for seed persistence of canola (Brassica napusL). Volunteer’s rapeseeds emerging from the soil seed bank can lead to unwanted gene dispersal to other plants after breaking secondary seed dormancy. At the current study, secondary dormancy was induced in 41 lines and 5 cultivars of canola under laboratory condition with using polyethylene glycol 6000, during 14 days and secondary seed dormancy recorded. This study was conducted as a randomized complete design. High germination percentage was observed at the all lines and cultivars (higher than 94%), and they were classified at five groups included very low, low, medium, high and very high secondary dormancy using cluster analysis. Among different lines, five genotypes were included at the very low group and two genotypes were included at the very high group. The other lines were placed in average and low groups. It was observed that five varieties (RGS003, Zarfam, Hyola401, Hyola308 and Hyola50) had average secondary dormancy (40-60%) that was related to breeding ignorance about secondary dormancy during seed production process. Lines classification based on different levels of secondary dormancy helps seed producers to select lines with low levels of secondary dormancy along with high yield and other characteristics, in order to deal with problems in seed producing process.
Abolfazl Faraji
Abstract
In order to study the effect of temperature and photoperiod (PP) on development rate of different vegetative and reproductive stages of canola, an experiment was conducted at Agricultural Research Station of Gonbad during 2005-2007. The experiment was a randomized complete block design arranged in a ...
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In order to study the effect of temperature and photoperiod (PP) on development rate of different vegetative and reproductive stages of canola, an experiment was conducted at Agricultural Research Station of Gonbad during 2005-2007. The experiment was a randomized complete block design arranged in a split-plot in two conditions, for example supplemental irrigation and rainfed. There were different regression equations between mean temperature and duration of development periods, i.e. a negative power equation for periods from planting to emergence and from emergence to beginning of budding, a quadratic equation for periods from beginning of budding to beginning of flowering and beginning of flowering to beginning of seed filling, and a negative linear equation for period from beginning of seed filling to physiological maturity. The decrease in seed filling period with increase in temperature was considerably higher in Hyola401 hybrid than RGS003 cultivar, indicating that the response of Hyola 401 development to temperature was more than RGS003. There was a positive linear relationship between mean PP from emergence to beginning of flowering with cumulative thermal time during this period, explaining 68 and 74 percent of the variation for Hyola401 and RGS003 cultivars, respectively, showing the positive effect of PP on canola development from emergence to beginning of flowering. Canola development was affected by PP and temperature during emergence to beginning of flowering, and temperature during beginning of flowering to physiological maturity.
Abolfazl Faraji
Abstract
To study the effects of used water in evapotranspiration, seed number per unit area and leaf relative water content on seed weight of canola (Brassica napus L.), an experiment was conducted as a randomized complete block design, arranged in a split-plot under two conditions, i.e. supplemental irrigation ...
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To study the effects of used water in evapotranspiration, seed number per unit area and leaf relative water content on seed weight of canola (Brassica napus L.), an experiment was conducted as a randomized complete block design, arranged in a split-plot under two conditions, i.e. supplemental irrigation and rainfed in 2005-7. Two cultivars of canola (‘Hyola401’ and ‘RGS003’) as subplots were grown at five sowing dates as main plots, spaced 30 days apart. There was a linear relationship between seed weight and used water in evapotranspiration. Irrigation increased seed weight and seed yield significantly. The mean 1000- seed weight under irrigation and rainfed conditions was 3.2 and 2.7g in 2005-6, and 4.2 and 3.7g in 2006-7. There was a strong linear relationship between seed weight and leaf relative water content, explaining 92 and 84 percent of the variation for ‘Hyola401’ and ‘RGS003’, respectively. For an each percent increase in leaf relative water content, 1000-seed weight of ‘Hyola401’ and ‘RGS003’ increased 0.191 and 0.146g, respectively. The strong relationships of seed weight with used water in evapotranspiration and leaf relative water content, over different environmental conditions and cultivars, showed these variables to be generally applicable in canola seed weight determination
Vahid Reza Jalali; Mahdi Homaei
Volume 12, Issue 1 , May 2010, , Pages 29-40
Abstract
Canola response to root media salinity highly depends on its phenological stage. In most investigations, this fact is neglected. Therefore in most studies a single threshold value for each plant is introduced. The objective of this study was to investigate the quantitative response of canola to salinity. ...
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Canola response to root media salinity highly depends on its phenological stage. In most investigations, this fact is neglected. Therefore in most studies a single threshold value for each plant is introduced. The objective of this study was to investigate the quantitative response of canola to salinity. The study was done in two different experiments. In the first experiment, canola was exposed to salinity from the first growth stage. In second experiment, plants were irrigated with saline water only at final growth stage. Both experiments were conducted on a natural saline loamy sand soil, using salinity treatments including a non-saline water (tap water) and eight saline waters of levels (3, 5, 7, 11, 13, 15 and 17 dS.m-1). The Maas and Hoffman, van Genuchten and Hoffman, Dirksen et al., and Homaei et al., models were used to predict relative yield as a function of soil salinity. The obtained results based on the calculated maximum error (ME), root mean square error (RMSE), coefficient of determination (CD), modeling efficiency (EF) and coefficient of residual mass (CRM) statistics indicated the Homaee et al., model provides better prediction for both experiments.