Zahra Yaghobian; Seyed Hossein Nemati; Ehsan Nematollahi
Abstract
To investigate the effect of seed coating on characteristics related to germination of lettuce seeds under drought stress conditions, a factorial experiment was conducted a completely randomized design with 4 replications during 2022. The experimental treatments include seed coating(C1:uncoated seeds ...
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To investigate the effect of seed coating on characteristics related to germination of lettuce seeds under drought stress conditions, a factorial experiment was conducted a completely randomized design with 4 replications during 2022. The experimental treatments include seed coating(C1:uncoated seeds (control), C2:seed coating with kaolin+gibberellin,C3:seed coating with kaolin+humic acid+gibberellin, C4:seed coating with gibberellin+micro elements+kaolin, C5:seed coating with gibberellin+ macro elements + kaolin, C6:seed coating with humic acid+micro+macro elements+ kaolin, C7:seed coating with gibberellin + humic acid+ micro + macro elements + kaolin and it was evaluated under three levels of drought stress(no stress(control),-0.4 MPa,- 0.8 MPa). In the stress condition of -0.8 MPa, only two treatments C2 (16%) and C3 (8%) had germination. In the stress of 0.4 MPa, treatments C1, C2, C3, respectively, in the characteristics of germination percentage (88.50, 61.75 and 27.50), germination speed (6.46, 3.91 and 2.25) and root index The seeds (130/28, 93/32 and 44/02) had significant differences with each other and also with non-stressed conditions (control); So that C1 seed (control) had 72.5% and C3 seed had 11.5% reduction in germination compared to non-stressed conditions. C3 coating improved the average germination time compared to C1 coating (3.07). The results of the experiment showed that drought stress is a limiting factor in the germination of lettuce seeds by limiting water absorption, and some treatments such as gibberellin+ kaolin coating and gibberellin+ kaolin+ humic acid improve the characteristics related to lettuce seed germination.
Leyla Cheheltanan; Ali Tehranifar; Mahmoud Shoor; Seyyed Hossein Neamati; Saeed Khosravi
Abstract
Self-pollination induces a phenomenon known as inbreeding depression in heterozygous plants, which in turn leads to a reduction in seed germination and seedling growth. On the other hand, seed priming with plant hormones such as gibberellic acid is a technical approach that potentially results in the ...
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Self-pollination induces a phenomenon known as inbreeding depression in heterozygous plants, which in turn leads to a reduction in seed germination and seedling growth. On the other hand, seed priming with plant hormones such as gibberellic acid is a technical approach that potentially results in the improves of rapid and continuous seed germination and subsequent plant growth. Therefore, this research aimed to investigate the effect of different concentrations of gibberellic acid on the improvement of seed germination resulting from self-pollination in various varieties of Petunia hybrida in a factorial experiment with three replications as a completely randomized design. The treatments consisted of four levels of gibberellic acid (0, 50, 100, and 150 mg/L) and seeds obtained from self-pollination of Iranian Petunia, Tango Blue, Tritunia Pink Morn, and Tritunia White. The results indicated that seed priming with gibberellic acid, especially at a concentration of 100 mg/L, led to a significant increase in the activity of α-amylase and β-amylase by 6.56% and 1.57%, respectively. This increase resulted in 8.54% rise in soluble sugars content, providing energy that significantly enhanced germination percentage, germination speed, average time required for germination, seed vigor index, germination energy, and the fresh and dry weight of plumule and radicle. Moreover, among different varieties, seeds obtained from self-pollination of Iranian petunia demonstrated a higher germination percentage and germination speed compared to seeds from other varieties, indicating a superior capability in maintaining vigor potential, germination percentage, and germination speed.
Sahar Rahmani; R. Tavakkol Afshari; Soroor Khorramdel; Seyyed Hossein Neamati
Abstract
Camelina (Camelina sativa) is an important oilseed crop from the Brassicaceae family. This plant is important due to its industrial, health and food applications, and the cultivated area of this product is increasing, and important features of this plant. It can be attributed to the low need of this ...
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Camelina (Camelina sativa) is an important oilseed crop from the Brassicaceae family. This plant is important due to its industrial, health and food applications, and the cultivated area of this product is increasing, and important features of this plant. It can be attributed to the low need of this plant for inputs and high resistance to biotic and abiotic stresses. A factorial experiment in the form of a complete block design using SAS statistical software of the seeds of two varieties of Camelina (Sohail and Line 69) in terms of the effect of foliar spraying of micronutrients iron, zinc, manganese and the combined treatment and the control treatment immediately after closing After the formation of 50% of the seeds, foliar spraying was done and it was investigated during 3 repetition. The images prepared from Camelina plant embryos were evaluated and checked and the results of image analysis were compared with the results of the germination . The results of this experiment showed that the seed of line 69, which had the minimum cotyledon length, the minimum embryonic axis length, the minimum seed length and the maximum seed width in the combined foliar spraying treatment, had the minimum ratio of the embryonic axis length to the seed length, the minimum cotyledon length ratio It is related to the seed length and the minimum seed length to width ratio that the smaller size of the seed in line 69 has led to a decrease in the percentage and speed of germination .
