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Germination percentage and germination rate of A. millefolium in response to several seed priming treatments (experiment in Petri dishes). Means within a column followed by the same letter are not significantly different according to Fischer's least significant difference test at a P=0.05 level
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This study evaluated the effects of seed priming on germination and growth of A. millefolium by means of laboratory and greenhouse experiments conducted during 2018 in the Agricultural University of Athens. Treatments were GA3 (400 and 800 ppm), potassium nitrate (2% and 4%), polyethylene-glycol (soaking for 12 and 24h) besides an untreated control...
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For plant populations to persist, seedling recruitment is essential, requiring seed germination, seedling survival and growth. Drought and grazing potentially reduce seedling recruitment via increased mortality and reduced growth. We studied these seed-related processes for two species indigenous to the Pamir Mountains of Xinjiang in northwestern C...
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... Priming seeds with potassium nitrate is associated with modulation of seed germination and seedling growth ecology of cucumis metuliferus. EUREKA: Life Sciences,4,[23][24][25][26][27][28][29][30][31][32][33][34][35] doi: http://doi. ...
... The potassium component could have contributed to the activation of enzymes which are responsible for germination hence, the presence of KNO 3 resulted in the quickening of germination. The results in this study are also in line with the results found by Kanatas et al. [28] in a study on Achillea millefolium L. Seed priming with potassium nitrate enhanced the germination rate. Results from this study also agree with Hoseini et al. [29], whose study results showed that seeds primed with KNO 3 had the greatest observed germination rates. ...
... The effect of KNO 3 on the dry weight of horned melon seedlings could be because of plant development due to the nitrogen in KNO 3, leading to more build-up of the plant biomass . Results from this study are in parity with the results obtained by Kanatas et al. [28]. Earlier studies demonstrated that, the dry biomass of the seedlings was substantially increased after seed priming of Achillea millefolium L with KNO 3 The results of this study also are in agreement with the results obtained where seed priming increased the dry weight of soybean seedlings [48]. ...
The horned melon (Cucumis metuliferus) is mostly grown in tropical and subtropical countries, where it thrives on deep to shallow, well-drained soils. Seed dormancy, which causes poor and delayed germination, has remained a problem for farmers in several African countries, including Zimbabwe, who have begun producing horned melon. Midlands State University conducted a laboratory experiment to evaluate the effects of potassium nitrate on seed germination and early seedling growth of horned melon. The experiment was set up in a Completely Random Design (CRD) with seven different potassium nitrate (KNO3) concentrations (0 %, 0.5 %, 1.0 %, 1.5 %, 2.0 %, 2.5 %, and 3.0 %), each duplicated three times. The data was analyzed using a one-way Analysis of Variance (ANOVA) in Genstat 18th edition. The characteristics of germination and early seedling development were assessed. All germination and early seedling development characteristics were significantly affected by potassium nitrate. Germination %, mean germination rate, germination index, mean daily germination percent, synchronization of germination, peak value for germination, and germination value all had a significant influence. Potassium nitrate had a significant influence on mean germination time and time to 50 % germination, with the lowest values obtained on seeds primed with 3 % KNO3. There was a significant difference in seedling height, root length, seedling length, fresh biomass, and dry weight between seeds primed with 2.5 % KNO3 and seeds not primed with 2.5 % KNO3. Farmers are advised to use 2.5 % KNO3 concentration for seed priming for optimal germination and early plant development of horned melon
... Reduced seedling growth due to seed ageing is the consequence of declined seed reserve depletion percentage (Mohammadi et al., 2011) [34] . A better seedling growth in terms of root and shoot length and seedling dry biomass due seed priming treatments has also been supported by previous workers (Lemmens et al., 2019;Kanatas et al., 2020) [28,22] . Improved seedling root and shoot length and seedling biomass might be due to earlier germination and emergence that stimulated seedling growth and vigour causing enhanced plant growth while as early emergence of primed seeds might be due to enhanced expression of germination metabolites such as amylase activity (Farooq et al. 2011) [12] . ...
... Reduced seedling growth due to seed ageing is the consequence of declined seed reserve depletion percentage (Mohammadi et al., 2011) [34] . A better seedling growth in terms of root and shoot length and seedling dry biomass due seed priming treatments has also been supported by previous workers (Lemmens et al., 2019;Kanatas et al., 2020) [28,22] . Improved seedling root and shoot length and seedling biomass might be due to earlier germination and emergence that stimulated seedling growth and vigour causing enhanced plant growth while as early emergence of primed seeds might be due to enhanced expression of germination metabolites such as amylase activity (Farooq et al. 2011) [12] . ...
A study was performed at SKUAST-Kashmir to understand the mechanisms of seed deterioration under AA and its reversal through subsequent OP. The seeds were exposed to AA treatment for 0, 48, 72 and 96 hours at 45±2 °C and 100% R.H. Each lot of treated seeds was further divided into four sub-lots and osmo-primed with PEG 6000 for 0, 24, 48 and 72 hours at 25±2 °C. Fifty seeds from each sub-lot were placed in petri dishes and placed in an incubator at 25 °C for recording various germination parameters. AA significantly reduced the GP and CVG from 85.56 and 43.78 (A0) to 12.66 and 9.00 (A3). There were significant reduction in shoot and root length (5.94 → 2.93cm; 4.83 → 2.99cm), seedling biomass (21.18 → 15.84md), SVIs (18.12 → 2.01; 921.5 → 75.0) in A3 compared to A0. However, these attributes were found to increase to maximum of 59.84%, 29.38, 5.38cm, 4.45cm, 19.69mg, 11.71 and 5.80 due to different OP treatments. In line, biochemical attributes like shoot chlorophyll, sugar, protein, MSI and anti-oxidant potential were also found to deprive due to AA effects and build up after OP treatments. Introduction Onion (Allium cepa L.) is an important bulbous vegetable that fetches highest foreign exchange among the fruits and vegetables. It is a herbaceous monocot plant cultivated as annual for vegetable but as biennial for seed production. The diverse agro-climatic conditions enable India to produce onion in one or the other part of the country round the year. Its popularity is due to its aromatic volatile oil, the allyl propyle disulfide (C 3 H 5 S 2 C 3 H 7) which imports a cherished flavour to food. Onion also has an important role as a medicinal herb and is claimed to minimize high blood pressure and other heart diseases due to its favourable action on the elasticity of blood vessels. A good quality of seeds with high physiological potential is a basic requirement for higher crop productivity and quality. However, seed quality losses gradually after harvest due to progressive deterioration of the structure and function of seed (ageing) that lead to the loss of viability (Mohammed, 1991) [33]. Loss of seed viability following ageing has been attributed to a series of metabolic defects that accumulate in embryonic and non-embryonic structures (Sisman, 2005) [50]. At the cellular level, seed ageing is associated with loss of membrane integrity, reduced energy metabolism, impairment of RNA and protein synthesis, and DNA degradation (Kibinza et al., 2006) [26]. Increased respiration of seeds due to high temperature, moisture content and O 2 /CO 2 ratio is considered as the main cause of seed deterioration. However, seed ageing and deterioration is inexorable and the best that can be done is to lower its rate (Coolbear, 1995) [9]. The detrimental effects of ageing may also be nullified (repaired) by exposure of aged seeds to osmopriming (Mouradi et al., 2016) [36] which may be described as a pre-sowing seed treatment in osmotic solution of low water potential followed by re-drying. It allows seeds pre-germinative metabolic activities to proceed (first stage of germination) but prevents radicle protrusion through the seed coat. Polyethylene glycol (PEG), mannitol, or salts are generally used to lower water potentials of the solutions which improve the speed and uniformity of germination, especially under adverse conditions. Seed deterioration under natural conditions takes longer time to affect the seed qualities. Artificially induced accelerated ageing (AA) is a useful technique to lower the seed viability quickly for experimental purposes (Rodo and Marcos-Filho, 2003) [43] which involves exposing seeds to
