Tag Archives: biostimulant

xxx H. Maaroufi-Dguimi, S. Gamal Mohammed, A. Nasraoui Hajaji and H. Abdalgadir
Efficiency of seed priming and co-treatment strategies in salt effect mitigation using Nicotiana glauca leaf extract on tomato seedlings (Solanum lycopersicum L.)
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Efficiency of seed priming and co-treatment strategies in salt effect mitigation using Nicotiana glauca leaf extract on tomato seedlings (Solanum lycopersicum L.)

H. Maaroufi-Dguimi¹*, S. Gamal Mohammed¹, A. Nasraoui Hajaji² and H. Abdalgadir¹

¹Al-Baha University, Faculty of Science, Department of Biology, SA 65779-7738 Alaqiq, Saudi Arabia
²University of Carthage, National Research Institute in Rural Engineering, Forest Ecology Laboratory, Water and Forestry Bp 10, TN 2080 Ariana, Tunisia
*Correspondence: houda_maaroufi@yahoo.fr

Abstract:

The Al-Baha region suffers from soil salinity, negatively impacting agriculture. Current study examined aqueous extracts from Nicotiana glauca as plant-based biostimulants to alleviate salinity’s effects and reduce chemical fertilizer use. An aqueous extract of N. glauca, applied in ascending doses of 20%, 50%, and 100%, was being used. This biostimulant was applied using two methods: seed priming and co-treatment on the seeds of Solanum lycopersicum L. Results indicated that all tested doses, whether applied through seed priming or co-treatment, enhanced the final germination percentage (FGP) and reduced the mean germination time (MGT) under saline conditions. With priming, the 20% dose was most effective in reducing salt treatment effects on FGP, improving it by 5% compared to untreated salt-stressed seeds. In co-treatment, the 100% dose showed a 4.5% reduction in FGP decline referring to untreated and stressed seeds. For priming treatments, the 20% dose reduced MGT by 22%, while the 50% dose in co-treatment reduced it by 28% compared to untreated and stressed seeds. The priming strategy used in this study did not result in significant enhancements in growth parameters, particularly in the fresh weight (FW) and dry weight (DW) of the epicotyls. As priming, the 20% dose had the most significant mitigation effect on epicotyl FW, DW and chlorophyll (Chl) content by 15%, 10% and 30% referring to untreated and stressed seedlings, respectively. However, all tested biostimulant doses used as co-treatment proved effective in mitigating the negative effects of salt on epicotyl and root FW, DW, and Chl content. Seedlings treated with various strategies and doses showed a smaller increase in malondialdehyde (MDA) and proline (Pro) levels under salinity stress. As stress indicators, both Pro and MDA levels were significantly reduced when a co-treatment strategy was applied. Furthermore, the results indicated that the effectiveness of the N. glauca aqueous extract in alleviating salt stress could be attributed to its content of several phenolics, flavonoids, and tannins, which possess antioxidant properties that enhance the plant’s tolerance against salt-induced oxidative stress.

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496–506 I.V. Knyazeva, O.V. Vershinina, V.V. Gudimo, A.A. Grishin and A.S. Dorokhov
The effect of succinic acid on the productivity of Lactuca sativa L. in artificial agroecosystems
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The effect of succinic acid on the productivity of Lactuca sativa L. in artificial agroecosystems

I.V. Knyazeva*, O.V. Vershinina, V.V. Gudimo, A.A. Grishin and A.S. Dorokhov

Federal State Scientific Institution «Federal Scientific Agroengineering Center VIM», Department of Closed Artificial Agroecosystems for Crop Science, 1st Institutskiy proezd, 5, RU109428, Moscow, Russia
*Correspondence: knyazewa.inna@yandex.ru

Abstract:

The research of the effect of the biostimulant on the growth and development of plants of the ‘Robin’ lettuce variety was carried out in 2019–2020 in the department of closed artificial agroecosystems for crop production on the basis of the Federal State Budgetary Scientific Institution «Federal Scientific Agroengineering Center VIM», Moscow (VIM, Russia). Succinic acid was used at the stage of inoculation of seed and with constant drip irrigation of plants throughout the growing period. Lettuce plants were grown using a low-volume technology in a climatic chamber produced by VIM (Russia). According to the studies carried out, inoculation of seeds stimulates the development of plants at the initial stages, reducing the period from sowing to germination and increasing the rate of plant growth. As the lettuce plants grew, the leaf surface area increased from 221.0 to 1511.9 cm² with the addition of succinic acid to the hydroponic nutrient solution. The use of succinic acid under controlled growing conditions of ‘Robin’ lettuce plants allowed to increase the performance of the leaf apparatus in relation to the control. It was experimentally established that productivity directly depended on the value of photosynthetic potential and net productivity of photosynthesis, which is confirmed by a strong degree of dependence with a correlation coefficient of 0.98 and 0.77, respectively. Seed treatment and adding succinic acid to the hydroponic solution increases the accumulation of dry matter in lettuce plants. With this method of using succinic acid, significant differences in the accumulation of dry mass of plants were established. The share of the effect of the factor of inoculation of seeds with succinic acid was 17.5%, the addition of hydroponics to the nutrient solution was 50.1%. The use of succinic acid increases the accumulation of plant biomass, increases the total leaf surface area, and also contributes to an increase in the parameters of photosynthetic activity of the leaf apparatus of the ‘Robin’ lettuce plants under controlled conditions of the climatic chamber.

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