Wyniki wyszukiwania - Biblioteka Nauki

1

Does priming promote germination and early stand establishment of french marigold (Tagetes patula L.) seeds by inducing physiological and biochemical changes?

100%

Mukhtar K. , Afzal I. , Qasim M. , Basra S. M. A. , Shahid M.

Acta Scientiarum Polonorum. Hortorum Cultus

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2013

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tom 12

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nr 3

EN

Poor plant stand establishment is a common problem for marigold production. Exposure to seed priming is one of the strategies being used to accelerate the activation of plant growth, especially seed germination in many crops. Therefore, an experiment was conducted to investigate the influence of different seed priming techniques on performance of French marigold. For this purpose, different seed priming techniques: hydroprimng, 50 mM CaCl2, 100 mg L⁻¹ salicylic acid and 100 mg L⁻¹ ascorbic acid were assessed. Seeds without any treatment were considered as control. Priming with 50 mM CaCl2 was proved to be the most effective treatment in enhancing germination and seedling vigour among all other treatments including control as shown by higher final germination/emergence, germination energy and lower mean germination/emergence time. Furthermore, positive correlation between reducing sugars and dry weight and α-amylase activity and the concentration of reducing sugars indicates that enhancement due to priming could be attributed to higher reducing and total sugars as well as higher α-amylase activity in primed seeds.

PL

Słabe wschody to powszechny problem w produkcji aksamitki. Kondycjonowanie jest jedną ze strategii stosowanych w celu przyspieszenia wzrostu roślin, zwłaszcza kiełkowania nasion. Przeprowadzono więc eksperyment mający na celu zbadanie wpływu różnych technik kondycjonowania na rozwój aksamitki. Oceniono różne techniki kondycjonowania nasion: hydrokondycjonowanie, 50 mM CaCl2, 100 mg L⁻¹ kwasu salicylowego oraz 100 mg L⁻¹ kwasu askorbinowego. Kontrolę stanowiły nasiona bez żadnych zabiegów. Okazało się, że kondycjonowanie za pomocą 50 mM CaCl2 było najbardziej skutecznym zabiegiem wzmagającym kiełkowanie i żywotność siewek w porównaniu ze wszystkimi innymi zabiegami, łącznie z kontrolą, co było widoczne na podstawie wyższego końcowego kiełkowania/wschodów, energii kiełkowania oraz mniejszego czasu kiełkowania/wschodów. Ponadto, dodatnia korelacja między cukrami redukującymi a suchą masą i aktywnością α-amylazy a także stężenie cukrów redukujących wskazujące na wzmożony wzrost będący efektem kondycjonowania można przypisywać wyższej zawartości cukrów redukujących i całkowitej zawartości cukrów oraz wyższej aktywności α-amylazy w nasionach poddanych kondycjonowaniu.

2

Inducing salt tolerance in french marigold (Tagetes patula) through seed priming

86%

Afzal I. , Rahim A. , Qasim M. , Younis A. , Nawaz A. , Bakhtavar M. A.

Acta Scientiarum Polonorum. Hortorum Cultus

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2017

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tom 16

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nr 3

EN

The present study investigates the potential of seed priming for induction of salt tolerance in French marigold at early growth stage. Treatments were combination of priming techniques viz. hydropriming, halopriming (50 mM CaCl2), hormonal priming with salicylic acid (100 ppm) and ascorbate priming (100 ppm) each for 24 h. Primed seeds were exposed to salinity levels (0; 50 and 100 mM NaCl) during germination and emergence assays. All priming treatments hastened germination and emergence attributes under saline or non-saline conditions as compared to those of non-primed (control) seeds. Seeds of French marigold primed with ascorbate followed by CaCl2, salicylic acid and hydropriming enhanced final germination, speed of germination, root and shoot length and dry mass of French marigold seedlings. This was interpreted by minimized mean emergence time and time to 50% emergence. Additionally, it was also observed that all priming agents particularly calcium salt and ascorbate maintained ionic homeostasis in salt stressed seedlings. It is concluded that CaCl2, ascorbate and salicylic acid were the most effective priming agents to ameliorate the adverse effects of salinity in French marigold due to lower uptake of Na+ and higher uptake of K+ in the seedlings.

3

Experimental evaluation of a diesel engine for combustion, performance and exhaust emissions with fuel blends derived from a mixture of fish waste oil and waste cooking oil biodiesel

86%

Ghaos Qureshi M. W. , Khan Z. M. , Hussain M. , Ahmed F. , Shoaib M. , Qasim M.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 4

EN

The production of biodiesel fuel for diesel engines from waste oil resources resolves a triple-faceted problem: environmental, economic and waste management. This study aimed to extract oil from fish waste, to convert the extracted oil into biodiesel fuel through base catalyzed transesterification and to reduce waste disposal-related environmental problems. Various fuel blends (CBFM10, CBFM20, CBFM30, CBFM40 and CBFM50) were prepared from a 1:1 mixture of waste canola oil biodiesel (WCOB) and transesterified fish waste oil (TFWO) with different proportions of mineral diesel. The mixture was named as the composite blends of fuel mixtures (CBFM). The fuel mixtures were subjected to physicochemical properties like kinematic viscosity, density, flash point and calorific values that were found with the international standard limits of biodiesel fuel and comparable to those of petroleum diesel with an added benefit to be lower in price being derived from waste resources. The formulated fuel blends were run in a 5.5kW stationary diesel engine to investigate combustion, performance and emission characteristics. In comparison to petroleum diesel, slightly higher BSFC, marginally lower BTE and shorter ignition delay was observed with CBFM fuel blends. As compared to fossil fuel diesel carbon monoxide (CO) and hydrocarbons (HC) were found to decrease by 2.8-25.1% and 2.2-19.9%, respectively. In comparison to all tested fuel blends, CBFM10 has shown lower nitrogen oxide emissions. The tested fuel blends were found to have great potential to be utilized as cheap and easily handled alternative fuels for compression ignition (CI) engines without any modification in any part of the engine.

4

Magnetic stimulation of marigold seed

86%

Afzal I. , Mukhtar K. , Qasim M. , Basra S. M. A. , Shahid M. , Haq Z.

International Agrophysics

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2012

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tom 26

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nr 4

5

Improved cut flower and corm production by exogenous moringa leaf extract application on gladiolus cultivars

72%

Younis A. , Akhtar M. S. , Riaz A. , Zulfiqar F. , Qasim M. , Farooq A. , Tariq U. , Ahsan M. , Bhatti Z. M.

Acta Scientiarum Polonorum. Hortorum Cultus

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2018

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tom 17

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nr 4

EN

Bio-stimulants are in excessive demand for the sustainable production of floriculture crops. The current investigation was designed to find out the effect of naturally occurring growth stimulant moringa leaf extract (MLE) on the growth, flowering, post-harvest life and corm production of two gladiolus cultivars (cvs.) ‘Rose Supreme’ and ‘White Prosperity’. The research trial was laid out in the factorial arrangement under randomized complete block design. Corms were grown in the open field under local climatic conditions of Faisalabad, Pakistan. Potential of exogenously applied (MLE; 30 times diluted) was evaluated. Treatments including spraying MLE at 3 leaves, 5 leaves, floral bud stage, one combination of these three stages relative to control with no foliar application. Application of natural bio-stimulant produced maximum height in both cvs. against T4. Both cvs. gave maximum stalk length in response to T4. The number of florets spike–1 found the maximum (13) in T1 compared to control T0 which yield (9) florets. Maximum vase life in sucrose solution (13.33 days) was exhibited by T1 for both cvs. while minimum (10 days) in T0. In cultivar comparison earlier spike emergence was observed in ‘White Prosperity’. In ‘Rose Supreme’ maximum corm weight was attained in response to T3 (43.43 g) while minimum (30.33 g) in T0.‘White Prosperity’ produced maximum weight (40.33 g) against T4 whereas minimum by control. The cultivar mean comparison showed the superiority of cormel diameter in ‘Rose Supreme’ (10.93 mm) than ‘White Prosperity’ (9.13 mm). In treatment comparison, T4 produced maximum diameter (12.04 mm) in ‘Rose Supreme’ moreover, T2 induced maximum (9.57 mm) diameter in ‘White Prosperity’.