In order to identify the accelerated aging effects on enzyme and lipid peroxidation in soybean an experiment was conducted based on completely randomized design by factorial arrangement with five levels of seed aging (3, 6, 9, 12, days to aging) and without aging, and two cultivars (Katol and Sahar) ...
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In order to identify the accelerated aging effects on enzyme and lipid peroxidation in soybean an experiment was conducted based on completely randomized design by factorial arrangement with five levels of seed aging (3, 6, 9, 12, days to aging) and without aging, and two cultivars (Katol and Sahar) with three replications in seed testing Lab of Agricultural and Natural Research Center of Golestan. Accelerated aging was achieved by incubating the seed in a closed plastic box at 40 degree centigrade and close to 100% relative humidity for up to 12 days. Seed viability, electrical conductivity, lipid peroxidation, superoxidedismutase, catalase, peroxidase, polyphenol oxidase, Ascorbate peroxidase activity were measured in aged and non-aged seed. The result indicated that antioxidant enzyme activities except peroxidase were reduced and it causedhigher malondialdehyde (MDA) and electrolyte leakage (EC). All of this effect caused lower seed vigor during aging. There was significant correlation between EC with percentage of seed germination and showed EC could be considered as a rapid method for evaluation of aged seed. Results showed that Katol cultivar was more tolerant than Sahar cultivar to seed aging.
Seed priming improves some properties of seedling. The objective of this research was to evaluate the effect of salicylic acid and gibberellins on germination characteristics and changes of biochemically of sunflower seeds under accelerated aging, experimental design was factorial with complete randomized ...
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Seed priming improves some properties of seedling. The objective of this research was to evaluate the effect of salicylic acid and gibberellins on germination characteristics and changes of biochemically of sunflower seeds under accelerated aging, experimental design was factorial with complete randomized design as base design with 3 replications. The first factor was priming by salicylic acid and gibberellin, secondary factor was combinations 4 levels of aging (0, 2, 4 and 6 days of aging at 41°C). The results showed that the priming and aging effects on germination percentage, germination index, normal seedling percentage, seedling length, vigor index, abnormal seedling percentage, catalase and ascorbate peroxidase were significant, but on mean time to germination not significant. Results showed that, the highest germination characteristics were attained from priming by salicylic acid and gibberellins under non aged conditions. Also, seed priming increases enzyme activity.
This research was conducted to evaluate the effect of drought stress andnutritioning with natural products on seed vigour under drought stress condition. Farm treatments were drought stress in four levels including normal irrigation (control), irrigation cessation at flowering, podding and flowering ...
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This research was conducted to evaluate the effect of drought stress andnutritioning with natural products on seed vigour under drought stress condition. Farm treatments were drought stress in four levels including normal irrigation (control), irrigation cessation at flowering, podding and flowering to physiological maturity stages and spraying with natural products in three level including spraying with distilled water (control), spraying with humic acid and spraying with seaweed extract and three varieties Hashem, ILC 482and local Miami (Local landrace) were used. Drought stress at germination stage induced by 0.8 MPa polyethylene glycol solution. The results showed that stressed seeds were larger than normal seeds and had higher germination percentage and mean germination time. Spraying could not alleviate the negative effect of drought stress. Totally drought stress on maternal plant was effective on stress tolerance and Miami (local landrace) was better than the other varieties. Results demonstrated that it is possible to enhance germination in stressed condition with making change in maternal environment.
Investigating the effect of seed priming in yield and yield components of Williams soybean cultivar under drought stress, an experiment was conducted in a randomized block design of split-plot. The experiment was repeated four replicant and it took place at the experimental station of Islamic Azad ...
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Investigating the effect of seed priming in yield and yield components of Williams soybean cultivar under drought stress, an experiment was conducted in a randomized block design of split-plot. The experiment was repeated four replicant and it took place at the experimental station of Islamic Azad university of Shahr-e-Ray. The main plots consisted of two treatments (that is, irrigation after 50 and 100 mm evaporation from pan evaporation was the optimum condition and drought stress) and subplot that include the five durations of priming seed ( that is, four times of soaking and drying the seeds for 2,4,6 and 8 hours in the shade without any primings ). A completely randomized design was conducted under laboratory environment with four replications. Priming seeds showed improvement percentage and germination rate under laboratory environment. As was observed in seed germination, seeds were soaked and dried each, for 4 hours with the average of 95/66 percent, had the highest percentage of germination. The lowest germination time was the 4 times soaking and drying seeds in 6 hours each, in shade in 1/29 days. The results showed that it decreased the drought stress, performance, number of pods per plant, seeds per pod, seed weight and harvest index. Priming seed in both irrigation and drought stress caused an improvement in seed yield, seed weight and harvest index. The highest seed yield was gained with four hours retrofitting and in the absence of stress with an average of 4012 kg per hectare. Also under the drought stress condition, priming caused yield improvements through growth and yield related traits. Accordingly Therefore priming in such environment had significantly better results in 4 hours and as a result of drought stress led to the highest seed yield of 2883 kg per hectare. Consequently the treatment of priming seed can be treated as a way of increasing the soybean seed yield in the different moisture conditions.
In order to evaluate the effect of drought stress and potassium foliar application on seed yield and seed germination characteristics of three wheat (Triticum aestivum L.) cultivars, an experiment was conducted in 2011-2012 at two locates, 1. Seed and Plant Certification and Registration Research Institute ...
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In order to evaluate the effect of drought stress and potassium foliar application on seed yield and seed germination characteristics of three wheat (Triticum aestivum L.) cultivars, an experiment was conducted in 2011-2012 at two locates, 1. Seed and Plant Certification and Registration Research Institute (SPCRI), Karaj- Iran 2. Agricultural and Natural Resources Research Center of Yazd-Iran. The experiment was carried out using a split plot factorial based on a randomized complete blocks design with three replications. The water treatments included three irrigation regimes; normal, mild stress (warer withhold at the grain filling phase) and severe stress (water withhold at the ear emergence phase); potassium foliar treatments included, 0, 1.5% and 3.0% K2O applications and three wheat cultivars (Marvdasht, Pishtaz and WS-82-9). Result showed that reaction of cultivars at two locates for seed yield was different under drought stress conditions. High and lowseed yield were producedwith WS-82-9 at Karaj under normal water use (9310 kg ha-1)and with Marvdasht cultivar at Yazd under sever drought stress (2220 kg ha-1), respectively. Seed weight and seed yieldshowed significantdecreases by increasing drought stress. The mentioned traits showed significantincreases by spraying of K2O and it was more at Yazd area under severe drought stress, because of more unfavorable condition. Spraying wheat plants with 3.0%K2O produced the highest value of seed yield (7321.9 kg ha-1); while control treatment (without potassium foliar application) at Yazd gave the lowest value of this character. Significant interaction of location× drought stress× cultivar on seed wastes showed that reaction of cultivars at two places was different under drought stress conditions, so that minimum and maximum seed wastes were observedin WS-82-9 at Karaj under normal irrigation (%2.26)and in Marvdasht cultivar at Yazd under severe drought stress (%54.76), respectively.Results revealed that high and lowseed wastes were observedunder no application of potassium (22.14%)and withspraying 3.0 % K2O (13.99%), respectively. Seed germination percentage before and after seed cleaning showed that seed cleaning had important role on improvement of seed quality, in a way that drought stress had significant influence on seed germination percentage before seed cleaning, but drought stress had no significant influence on seed germination percentage and mean germination time after seed cleaning.
In order to evaluate seed priming effects on resistance of wheat germination against allelopathic stress caused by various bindweed (Convulvulus arvensis L.) organs, a study was carried out as factorial experiment in completely randomized design with four replications in research laboratory of Karaj ...
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In order to evaluate seed priming effects on resistance of wheat germination against allelopathic stress caused by various bindweed (Convulvulus arvensis L.) organs, a study was carried out as factorial experiment in completely randomized design with four replications in research laboratory of Karaj agriculture faculty (2012). Treatments were seed priming (distilled water, hydropriming and osmopriming with 15 and 45 ds/m of urea for eight hours), wheat cultivars (Niknezhad and Pishtaz), extracts of various bindweed organs (leaves, stem, root and total plant) and various extract concentrations (25, 50 and 100%). Results showed that extract didn’t affect germination percentage and plumule length but radicle length was increased by various concentrations of extract in hydroprimed seeds. The highest reduction in plumule length was observed in total plant extract whereas stem extract caused the highest radicle reduction. According to the results, Niknezhad cultivar showed superiority in all treatments because of better plumule and radicle length.Root lengthin seedprimingwithwater under Extractconcentration in Niknezhad 27/54per cent and thecultivar Pishtaz14/45percentlower than the control was reducedAlso water hydropriming could reduce the negative effects of bindweed extract on radicle length.
In order to evaluate the effect of different seed priming treatments on germination parameters improvement in Pisumsativum L.a factorial experiment was conducted in completely randomized design with four replications in seed science and technology laboratory of agriculture faculty, Shahrekord University ...
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In order to evaluate the effect of different seed priming treatments on germination parameters improvement in Pisumsativum L.a factorial experiment was conducted in completely randomized design with four replications in seed science and technology laboratory of agriculture faculty, Shahrekord University in 2013. The experimental factors were consisted as priming types (osmopriming, halopriming and hydropriming) and priming times (12, 24 and 36 hours). Results showedthat different priming treatments had significant effect on radicle length, shoot length, shoot dry weight, radicle dry weight, germination percentage, germination rate, relative germination, vigor indexesIn addition to,priming times had significant effect in all measured traits except germination rate Themaximum radicle length, germination percentage, relative germination and vigor index I achieved with concentration of 1.1 MPa PEG and 24 hours. The maximum shoot length and germination rate obtained with distilled water treatment, 24 hours and concentration of 0.7 MPa PEG, 24 hours, respectively. The lowest amount of all measured traits was observed in concentration 1.2 MPa KNO3 with 36 hours. In conclusion, the high doses of PEGwith 24 hoursis suitable for germination improvement of pea seeds.
This experiment was done to find those dorum (Triticum durum Desf) traits which effectively distinguish different cultivars from each other. For this purpose, Iranian varieties were studied using morphological Characteristics. The Guidelines for the conduct of tests for Distinctness, Uniformity ...
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This experiment was done to find those dorum (Triticum durum Desf) traits which effectively distinguish different cultivars from each other. For this purpose, Iranian varieties were studied using morphological Characteristics. The Guidelines for the conduct of tests for Distinctness, Uniformity and Stability were used as recommended by UPOV. Eight common varieties (Arya, Behrang, Dena, Dehdsht, Saji, Seymareh, Karkheh and Yavarous) were sown using a randomized complete block design with three replications for the years 2011-2012 at Seed and Plant Certification and Registration Institute, Karaj, Iran. Twenty nine morphological traits were then observed visually or measured for all varieties observed in the test. The variety distinctness was evaluated using analysis of variance, means comparisons (LSD) and cluster analysis. The results of analysis of variance of five quantitative traits (plant length, length of ear, length of awns at thetop of ear, pith in cross of straw and ear density) revealed the significant difference existed between all the cultivars. The results obtained from Comparison between 8 varieties showed that there was significant difference in the plant length, length of awns at the top of ear, ear density and length of ear distinct one pair varieties (a total of 25 pairs. While, this trait could distinct twenty, five, two and one pair varieties respectively at %5 of probability level. The Cluster analysis of qualitative characteristics caused that all varieties to be categorized into two main groups. Cluster analysis of quantitative traits, divided the varieties in different group as well
Thymus daenensisis endemic medicinal plant of Iran and belong to Lamiaceae family.In this study germination behavior of Elamecotype of Thymus daenensis subsp. daenensis under various temperatures was studied. Seeds were exposed to nine constant temperatures ranging from 3°C to 40°C. Analysis ...
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Thymus daenensisis endemic medicinal plant of Iran and belong to Lamiaceae family.In this study germination behavior of Elamecotype of Thymus daenensis subsp. daenensis under various temperatures was studied. Seeds were exposed to nine constant temperatures ranging from 3°C to 40°C. Analysis of variance revealed clear differences in temperature requirements for seed germination in the ecotype. To determine cardinal temperature, Germination rate-temperature relationship was considered. Two regression models; Intersected lines and Plateau were used to describe these relationships.The result was evaluated through regression coefficient (R2) and root mean square error (RMSE). The comparison results showed that the best model was plateau model. The based temperature was predicted 1.4°C, the optimum germination rate were within the ranges of 20°Cto 24.7°C and ceiling temperature 39.68°C in this ecotype.Temperature had a significant effect on germination indices such as coefficient uniformity germination, germination index, daily germination speed, mean germination timemeangermination daily and etc. Result in the present study reveals that Elam ecotype was adapted to lower temperatures in order to avoid summer drought and to benefit winter humidity.