ahmad zare; aydin khodaeaei; zienab khezrepoor
Abstract
In order to evaluate the response from chia (Salvia hispanica L.) to temperature, under abiotic stresses (salinity and drought) three separate experiments was carried out in the laboratory of Agricultural Sciences and Natural Resources at University of Khuzestan in four replications in 2018. Treatments ...
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In order to evaluate the response from chia (Salvia hispanica L.) to temperature, under abiotic stresses (salinity and drought) three separate experiments was carried out in the laboratory of Agricultural Sciences and Natural Resources at University of Khuzestan in four replications in 2018. Treatments included temperature (5, 10, 15, 20, 25, 30, 35, 40 and 45 °C), salinity (0, 50, 100, 150, 200, 250, 300, 350, and 400 mM), and drought stress (-0.2, -0.4, -0.6, -0.8, -1, 1.2, and 1.4 MPa). In response to temperature, chia proved to be capable of germinating in the range of 10 to 40 °C. The base temperature, optimum temperature, and ceiling temperature were predicted to be 6, 28, and 44°C respectively. Germination percentage and germination rate decreased in response to salinity and at salinity of 400 mM, germination was completely inhibited. Salinity reduction of 50% in germination percentage and germination rate obtained at salinity 349 and 236 mM. 50% reduction in germination percentage and germination rate was observed at -0.92 and -0.79 MPa of drought stress. According to x50 parameter, chia is resistant to salinity and drought stresses. In conditions of saline soils and drought stress, it can be recommended for cultivation to farmers.
Sahar Binesh; Gholam abbas Akbari; Elias Soltani; Fatmeh Amini
Abstract
In order to examine the germination response of basil medicinal plant’s seeds (Ocimum basilicum L.) to temperature and determination of cardinal temperatures for germination percentage and rate, a compound decomposition experiment was performed through a fully random design with four reptile and ...
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In order to examine the germination response of basil medicinal plant’s seeds (Ocimum basilicum L.) to temperature and determination of cardinal temperatures for germination percentage and rate, a compound decomposition experiment was performed through a fully random design with four reptile and six thermal levels (8, 15, 20, 25, 30, and 35 degree centigrade) in seed technology laboratory of Abou-Reyhan campus in Univerity of Tehran. In this study, 22 Basil masses were evaluated including “Tehran”, Green Shahr-e-Rey”, “Green Birjand”, “Purple Birjand”, “Green Shiraz”, “Green Zabol”, “Zahedan”, “Green Zahedan”, “Kermanshah”, “Green Pishva”, “Purple Pishva”, “Green Malayer”, “Khash”, “Local green Tonekabon”, “Green Isfahan II”, “Purple Isfahan II”, “Green Isfahan III”, “Green Isfahan IV”, “Green Mash’had”, “American green Napolta”, “Italian Genovese”, and “Switzerland” . Based on the results of variance analysis, temperature impact, genotype, and their interaction on germination percent and germination rate was significant at the 5% level. Optimal range of temperature for germination percent and germination rate was obtained as 19.10-27.78 and 20.32-29.89 degrees centigrade, respectively. In most masses, the highest germination rate was observed at 25 degrees centigrade. Among all evaluated masses in current research, Isfahan III was appropriated the highest germination rate in all temperatures. The results of experiment showed that the response of germination percentage and germination rate to temperature was well described through Beta function and segmented function, respectively, and cardinal temperatures can be determined for Basil using these two models.
Roqia Adeli; Elias Soltani; Gholam Abbas Akbari; Hossein Ramshini
Abstract
Identification of cultivars with tolerance to water stress has important for crop production in arid and semi-arid areas. In order to, a factorial experiment was conducted based on completely randomized design with two factors of 20 genotypes of canola and 5 water potentials of 0, -0.15, -0.3, -0.5, ...
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Identification of cultivars with tolerance to water stress has important for crop production in arid and semi-arid areas. In order to, a factorial experiment was conducted based on completely randomized design with two factors of 20 genotypes of canola and 5 water potentials of 0, -0.15, -0.3, -0.5, and -0.8 MPa in 4 replications in Seed Technology Laboratory of College of Aburaihan, during 2015-16. Seed germination of different genotypes was recorded twice in a day for each water potential at 20oC. Thereafter, hydrotime model was fitted to time course germination. Results indicated that Karaj 1 and Opera had the lowest value of base water potential with -1.23 and -1.2 (MPa) and they were the most tolerant genotypes to drought. Genotypes of 203 and Likord had the highest value of base water potential with -0.27 and -0.22 and the most sensitive genotypes to water stress. The lowest hydrotime constant belonged to Zarfam and Talaye with 22.67 and 23.73 MPa-hours and the highest hydrotime constant belonged to 389 and Opera with 50.93 and 48.07 MPa-hours. The base water potential with 95% had the highest broad sense heritability. Using this information it is possible to identify genotypes with higher efficiency and more tolerate to water stress in future breeding programs to breed new genotypes with tolerance to water stress.
Mahmoud Lotfi; Elham Ali abadi; Ali Rezvani; Reza Amiri
Volume 13, Issue 1 , August 2011, , Pages 65-74
Abstract
The effects of priming treatment using five osmotic solutions (PEG, manitol, KNO3, KH2PO4 and combination of two salts) in six osmotic potentials (-1 to -1.5 MPa) was studied on germination percentage, rate and uniformity of melon seeds. The best results were obtained with high concentrations of KNO3 ...
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The effects of priming treatment using five osmotic solutions (PEG, manitol, KNO3, KH2PO4 and combination of two salts) in six osmotic potentials (-1 to -1.5 MPa) was studied on germination percentage, rate and uniformity of melon seeds. The best results were obtained with high concentrations of KNO3 and lower concentrations of manitol. Mean germination time of melon seeds in 19°C was preceeded 36 to 48 hours and more uniformity observed but percent germination decayed a little (1-4 percent) reduced in some cases. In addition, storage of primed seeds in room temperature for four months reduced their quality lightly however major priming effects were conserved. In second trial which was done using KNO3 and manitol seeds were suspended in solutions freely or inside bags and also under temperatures 19°C and 22°C, the fastest germination was occurred using manitol inside bags and -1.5 MPa. Effects of priming were more abvious in lower temperatures and also lower potentials showed had better results for uniformity, consistantly.