Atefeh Beilari; Jamal-Ali Olfati; Masood Esfahani; Nader Pirmoradian
Abstract
This study aims at evaluating the yield of cucumber genotypes in two seasons, and identifying cucumber genotypes with high yield and stability. The research has been carried out in the greenhouse of the Department of Horticultural Sciences, University of Guilan, as a factorial experiment in a completely ...
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This study aims at evaluating the yield of cucumber genotypes in two seasons, and identifying cucumber genotypes with high yield and stability. The research has been carried out in the greenhouse of the Department of Horticultural Sciences, University of Guilan, as a factorial experiment in a completely randomized design in autumn and spring seasons with nine cucumber genotypes in three replications. Results show that in terms of number of female flowers in autumn and spring, genotype C1 with an average of 16.7 per plant and genotype C8 with an average of 7.0 per plant have been the best, respectively. Also, in terms of leaf area, C10 genotype with an average of 2866.6 cm2 in autumn and C8 genotype with an average of 9340.990 cm2 in spring outperform the rest and can be used to achieve suitable hybrids for each growing season. Results of principal components analysis and population biplot show that C8 genotype is a suitable genotype for cultivation in two cropping seasons in terms of stability of yield-related traits and vegetative traits. Finally, in terms of number of fruits, genotype C1 with an average of 5.0 per plant in autumn, and C10 genotype with an average of 5.0 per plant in spring have been superior.
Maryam Saraei; Morteza Moballeghi; Morteza Nasiri; Mojtaba Nashaeemoghaddam
Abstract
The remobilization of carbohydrates in shoots is one of the effective factors to grain filling in rice. To determine the contribution of dry matter remobilization of shoots in different rice genotypes, a research has been carried out with seven rice genotypes and two controls in RCBD design with three ...
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The remobilization of carbohydrates in shoots is one of the effective factors to grain filling in rice. To determine the contribution of dry matter remobilization of shoots in different rice genotypes, a research has been carried out with seven rice genotypes and two controls in RCBD design with three replications during 2017-2018 at rice research station of Shahid Shiroodi in Tonekabon county. Results show that among all genotypes, rate of dry matter remobilization via the flag leaf, stem, and total shoot has differed significantly at (p<0.01) percent and from other leaves at (p<0.05) percent level. Mean comparison among the genotypes indicates that the highest dry matter remobilization from flag leaf belongs to Genotype 952 with 56 g.m-2. The maximum carbohydrates remobilization in other leaves, stem and total shoots are assigned to Genotype 953 at 123, 230, and 398 g.m-2, respectively. Highest grain yield belongs to Genotype 952 with 7206 kg.ha-1. Correlation analysis results show that grain yield is positively and significantly correlated with dry matter remobilization from flag leaf, stem, and total shoots, as well as 1000-grain weight, having coefficients of 0.37, 0.55, 0.51, and 0.44, respectively. As a result of yield and dry matter remobilization rate, and the positive and significant correlation between them, both Genotypes 952 and 953 are suitable for continuing research activity and introduce a new rice cultivar especially in drought and hot stress conditions at the grain filling stage.
Davood Sadeghzdeh Ahari
Abstract
Seed size has been known role as one of the important and effective traits on the yield, growth and development in many field crops. In order to study the effect of chickpea genotypes seed size on drought tolerance an experiment carried out as split-split plots based on randomized complete blocks design ...
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Seed size has been known role as one of the important and effective traits on the yield, growth and development in many field crops. In order to study the effect of chickpea genotypes seed size on drought tolerance an experiment carried out as split-split plots based on randomized complete blocks design during three cropping seasons (2010-2013). Drought stress levels as main plots were one-time irrigation at the planting, two and three times (each one after one month from planting date) and four chickpea genotypes ("Arman", "Azad", "ILC 482" and a "landrace from Turkey") were included in sub plots and three seed sizes (large seeds with > 8 mm, medium seeds with 6-8 mm and small seeds with less than 6 mm in diameters) were included in sub plots. Date of flowering and maturity, grain filling period, growth vigor (in start of flowering and maturity stages), plant height, 100 grain weight, dry biomass and grain yields were measured and analyzed. Drought tolerances of seed sizes and genotypes evaluated by using of different stress tolerance indices (Stress Susceptibility Index, Stress Tolerance Index, Tolerance Index, Mean Productivity Index and Geometric Mean Productivity Index) and based on the grain yields and traits ranking method. Results showed that the highest grain yields belonged to medium and large seed sizes (900 kg ha-1). In conclusion and based on drought tolerance indices and traits ranking method, "Azad" cultivar was tolerated to drought stress. The small and large seeds were susceptible and tolerated to drought stress, respectively.
ali naderi arefi; ali ahmadi; Manijeh Sabokdast
Abstract
This study was carried out to examine the effects of drought stress on cotton leaf characteristics and its yield during 2014. The experiment was conducted in greenhouse and field conditions at Garmsar agricultural research station. The experimental design was RCBD with 3 replications arranged in split ...
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This study was carried out to examine the effects of drought stress on cotton leaf characteristics and its yield during 2014. The experiment was conducted in greenhouse and field conditions at Garmsar agricultural research station. The experimental design was RCBD with 3 replications arranged in split plots. Main plots and subplots designated to water stress levels and genotypes, respectively. In greenhouse, water stress decreased RWC and Excised Leaf Water Loss (ELWL). RWC of genotypes No.221, Aria, Narabri, and Sepid was higher than the others. ELWL of Aria, K8801 and K8802 was more than other genotypes whichalso their RWC was higher. ELWL of Varamin and Sahel cultivars were the lowest. At field conditions, the effects of 9, 12, 18, 24 and 30 day irrigation intervals after first flower stage, on yields of these cultivars were studied. Nine days intervals increased the yield of Varamin, Khordad and K8801 but their difference was not statistically significant. At fourth and fifth irrigation intervals,the yield of all genotypes decreased. 18 days intervals lead to yield loss too, but, because of insignificant decrease and for efficient use of water, it can be recommended that after normal irrigation from planting to first flower, to irrigate of cotton at 18 day intervals. Extension of K8801 can reduce water use and may help to permanent production.
Javad Hasanpour; Kaveh Zargari; Behnam Zand; mojtaba kanani
Abstract
In order to study the effects of planting date and cultivar on yield, protein percentage and physiological growth indices of Mungbean an experiment was conducted in Agriculture and Natural Resource Research Center of Tehran province in 2011-12. Four mungbean [Vigna radiata (L.) Wilczek] cultivars (‘Parto’, ...
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In order to study the effects of planting date and cultivar on yield, protein percentage and physiological growth indices of Mungbean an experiment was conducted in Agriculture and Natural Resource Research Center of Tehran province in 2011-12. Four mungbean [Vigna radiata (L.) Wilczek] cultivars (‘Parto’, ‘Gohar’, ‘Mehr’ and a promising line ‘NM-94’) were sown at 3 dates with 30 days intervals starting from 21 April to 22 June to identify the suitable variety(s) and optimum sowing date for getting maximum yield of mungbean. The design was a split-plot replicated three times with sowing date as main plots and cultivar as sub-plots. Promising line ‘NM-94’ was ranked first in terms of seed yield (1797.4 kg ha-1) followed in order of ‘Gohar’ (1674.8 kg ha-1). The highest seed yield (1678.2 kg ha-1) was obtained from 22 June sowing date. Delayed sowing caused to decrease of growth period length from 92.9 (for 22 April) to 82.6 (for 22 June) that it resulted to a significant decrease of vegetative growth indices such as plant height and biological yield. The maximum LAI and CGR were obtained at a longer time and had more value for earlier sowing dates. The growth period length decreased for the last sowing date, but early entering to flowering stage increased grain filling portion from total growth period. Sowing date had not a significant effect on protein percentage, but this effect was significant for varieties. ‘NM-94’ line and 22 June were the best choices for south east region of Tehran province.
Abdolsatar Darabi; Reza Salehi
Abstract
Quantitative and qualitative characteristics and storability of Behbahan landrace, selected population from Behbahan landrace and Primavera cultivar were compared for two years (2009-2010) at Behbahan Agriculture Research Station. Field experiment was performed based on randomized complete block design ...
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Quantitative and qualitative characteristics and storability of Behbahan landrace, selected population from Behbahan landrace and Primavera cultivar were compared for two years (2009-2010) at Behbahan Agriculture Research Station. Field experiment was performed based on randomized complete block design containing four replications. Seedlings were transplanted in mid-December. A split plot in time experiment based on randomized complete block design containing four replications was used to compare the storability of studied populations. Populations were considered as main plot in three levels and the date of bulb observations as sub plot in thirteen levels. Bulbs were stored in non-control storage. The observations were done for sprouting, rotting, incidence of black mould and weight losses percent at 15 day intervals. The results showed that the differences of total yield (fresh) among populations were not significant, however marketable yield of Behbahan bred onion and Primavera cultivar was significantly higher than Behbahan landrace. The yield of bulb dry weight of Behbahan bred onion was higher than source landrace and Primavera cultivar at 5% and 1% probability level. Bulb dry matter percent and bulb colour uniformity of Behbahan bred onion was higher than source landrace. In the other hand the percent of double bulbs and neck diameter of Behbahan bred onion was lower than source landrace. The difference of storability between Behbahan bred onion and source landrace was not significant, but the storability of Primavera cultivar was significantly lower than other populations.
Ali Asadi Kangarshahi; Gholam Reza Savaghebi; Mahmoud Samar; Mohsen Farahbakhsh
Abstract
Changes in chlorophyll florescence is one of the physiological responses of plants to waterlogging stress. Due to easily measured in field and its inexpensive and non-destructive characteristics, it is one of the best ways to assess different genotypes tolerance to stresses. In this experiment, trends ...
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Changes in chlorophyll florescence is one of the physiological responses of plants to waterlogging stress. Due to easily measured in field and its inexpensive and non-destructive characteristics, it is one of the best ways to assess different genotypes tolerance to stresses. In this experiment, trends of chlorophyll fluorescence index (Fv/Fm) of ‘Satsuma’ mandarin (Citrus unshiu) on seven rootstocks (sour orange, Swingle citromello, Carizo citrange, Troyer citrange, C-35, Smooth flat sevil and Gou tou) were determined in some soils of East Mazandaran. The experiment was conducted as factorial in a randomized complete block design. The results showed that effect of different factors on changes of chlorophyll fluorescence were significant. Soils 7 and 1 had the highest and lowest index, respectively. The effect of different rootstocks on fluorescence index showed that with increasing duration of waterlogging, this index drops increasingly compared to the beginning of waterlogging. Gou tou and Sour orange had the highest and lowest fluorescence during waterlogging, and Swingle, Carizo, Troyer, Smooth and C-35 placed after Gou tou, respectively. In addition, tolerance of rootstocks to waterlogging was different in various soils of this area.