Ali Shayanfar; Samad Mobasser; Bita Oskouei; Leila Zare
Abstract
Camelina Cv. Soheil seed storability was assessed to simulate after-harvest condition till the following growing season. Seven seed samples were collected from Shirvan, Fasa, Marvdasht, Kermanshah, Hamedan, Sabzevar, and Ilam regions and saved for six months in two storage condition (with two temperatures ...
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Camelina Cv. Soheil seed storability was assessed to simulate after-harvest condition till the following growing season. Seven seed samples were collected from Shirvan, Fasa, Marvdasht, Kermanshah, Hamedan, Sabzevar, and Ilam regions and saved for six months in two storage condition (with two temperatures of 10 and 25ºC). Then, they were drow out monthly from storage condition to evaluate different seed germination index and vigour. Moisture seed content did not acced more than 10 percent in all treatments. Germination percentage and normal seedlings were more than 94% after 6 months of storage in all seed samples and two temperatures. Weight seedling vigour showed no significant differences in all samples, except the Sabzevar sample. The effects of three factors (seed samples, temperature and storage time) on rate germination index were difference. Seed physiological responses (in terms of rate germination) to 10 and 25ºC temperatures were similar until the fourth months in more samples. However, a declining process was observed from the fourth month at 25ºC and from the fifth month at 10ºC for these responses and accend minimum in six months. Two seed samples of Hamedan and Kermanshah showed higher rate of germination. In total, Camelina seeds showed high storage potential due to high germination percentage was recorded after six months of storage. In addition, if seeds stored for more than 4 months, plants in field condition lower germination rate will observe.
K. Moslemkhani; Farshid Hasani; Esmail nasrollahi; Samad Mobasser; Mohammadreza Jazayeri
Abstract
Fast and precise detection of infected potato plants is an essential practice in the seed potato certification system. Spectral fingerprinting as non-destructive and rapid method is going to be developed for discriminating plants with different stress such as disease. In this research virus infections ...
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Fast and precise detection of infected potato plants is an essential practice in the seed potato certification system. Spectral fingerprinting as non-destructive and rapid method is going to be developed for discriminating plants with different stress such as disease. In this research virus infections of experimental plants (that infected with both PVY and PLRV viruses) were analyzed by spectral data without any destruction. Spectral data were collected from 32 plants (16 infected plants and 16 healthy plants) that were found to be infected or healthy using the ELISA and RT-PCR test. Some pretreatment methods of spectral data such as multiplicative scatter correction were used to remove noise. Soft independent modeling of class analogy (SIMCA) based on PCA analysis predicted the disease with high detection accuracy. The results showed, none of the samples belonged to the wrong group or to two groups simultaneously. The wavelengths in three ranges of 910-863 nm (near-infrared ), 725-704 nm (red edge) and 580-530 nm (green), had the greatest contribution to the complete differentiation of infected and healthy plants and development of models respectively.
Zahra Radmanesh; Samad Mobasser
Abstract
This study was aimed to determine the effect of seed size of the first (main) ear and the second ear and drying methods on seed quality of maize hybrid Maxima. For this purpose, two different experiments, including seed production field and laboratory experiment were conducted in 2014 and 2015, in Karaj. ...
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This study was aimed to determine the effect of seed size of the first (main) ear and the second ear and drying methods on seed quality of maize hybrid Maxima. For this purpose, two different experiments, including seed production field and laboratory experiment were conducted in 2014 and 2015, in Karaj. Six rows of maternal line and two rows of paternal line were planted in seed producing field in Shahid Motahari research Station in Sugar Beet Seed research Institute. The second experiment was conducted in qualified seed testing laboratory in SPCRI. The treatments composed of two levels of seed size (7mm and 6mm), two ears position (the first (main) and the second) and two drying methods (air drying and artificial drying). Results showed that the interaction of ear position, seed size and drying methods was significant for GP, GMD, Allometric index, SL, RWW, HW and Alpha-amylase activity. Maximum and minimum of seedling length was 34.48 cm and 30.42 cm respectively and related to seed size of 7 mm of the main ear. Moreover, maximum of germination percentage was 100% that related to seed size of 7mm and 6mm of the first ear which dried by dryer, while minimum value was 83% that related to seed size of 6mm of air dried ears. According to the results of this experiment it seems that seeds of maize hybrid Maxima of 7 mm that were dried by dryer machine because of priority of germination traits are more suitable for cultivation.
Volume 3, Issue 1 , March 2014, , Pages 123-135
Abstract
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.
Volume 1, Issue 2 , December 2012, , Pages 161-171
Abstract
An investigation to show importance of contamination of informal wheat seed to seed-borne diseases were conducted in Golestan Province. In 2007, a field survey was conducted in growing wheat fields using informal seed for planting in 6 towns of Golestan Province as Aliabad, Aghghala, Gorgan, Kalaleh, ...
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An investigation to show importance of contamination of informal wheat seed to seed-borne diseases were conducted in Golestan Province. In 2007, a field survey was conducted in growing wheat fields using informal seed for planting in 6 towns of Golestan Province as Aliabad, Aghghala, Gorgan, Kalaleh, Gonbad, and Fazelabad in order to identify the casual agent of seed-borne diseases on or in the seeds. Washing, deep freeze blotter, agar plate and embryo tests were used to isolate and identify the spores present on different part of the seeds. The results indicated 0.09- 45.55- 0.37- 66.19- 0.37- 0.17- 47.55- 0.12 -69.0 and 0.37 percent of Aliabad, Kalaleh, Gonbad, Gorgan, Aghghala, and Fazelabad seeds were infected by Ustilago tritici and Fusarium head blight, respectively. No seed samples was observed to be infected by Tilletia spp. spores in Golestan Province. Coefficient between Fusarium disease and factors involved in disease variablesare also studied. Continuously cultivation of wheat after corn causes an increase in Fusarium head blight, and nitrogen fertilizer application increases this disease. Micro-elements application can increase resistance ability of plant against these diseases
