A pot experiment was carried out during two successive seasons (2014 and 2015) at Salinity and Alkalinity Soil Research Laboratory in Alexandria. The goal of this work was to study the response of rosemary (Rosmarinus officinalis L.) plants irrigated with saline water at 0, 2000 and 4000 ppm NaCl to the application of antistress agents (salicylic acid "SA" at 0 and 0.2 mM and diatomaceous earth "DDM" at 0 and 6 g/10 kg soil). The effect of these antistress agents on the vegetative growth, volatile oil percentage and its chemical composition were recorded. In general results indicated that irrigation with saline water and antistress agents (DDM and SA each of them solely) had a significant effect on vegetative growth expressed as plant height, number of branches/plant, herb fresh and air dry weights and volatile oil percentage as compared to control in most treatments in both cuts of the two seasons. Moreover the plants received diatomaceous earth (DDM) at 6 g/10 kg soil combined with irrigation with non saline water (tap water) recorded the highest values of vegetative growth and volatile oil percentage in both seasons at the two cuts. Also the highest camphor content was achieved with this treatment. Proline content was decreased with increasing the rate of diatomaceous earth followed by salicylic acid, this refers to the response of rosemary plants grown under salt stress to the application of antistress agents (DDM and SA).
Soil salinity is one of the major yield-limiting factors for crop production in many agricultural regions all over the world. Besides following efficient management practices at the field scale to reduce accumulation of salts in the effective root-zone, the effective use of treatments to alleviate the effects of salinity stress and improve crop salt tolerance is a promising solution to ensure crop production in such adverse conditions. A field experiment was carried out to investigate the effect of foliar spray with plant-based biostimulant (i.e. with and/or without 3% yeast extract), three levels of proline (0, 25, and 50 mM), and combined with potassium fertilizers, as potassium sulfate, 48% K 2 O (0, 50, and 100 kg/fed.) on growth promotion, chemical composition of garlic leaves, bulb quality parameters as well as yield and its components of garlic plant grown under moderate saline soil. Results revealed that the interaction between foliar spray with yeast extract at 3% and proline at 50 mM combined with proper K level at 100 kg/fed., was the best interaction treatment for increasing vegetative growth parameters, i.e. plant height, number of leaves per plant, and mineral contents (N, P, K, S, Ca and Mg in leaves), and proline content of garlic leaves after 135 days from planting time, total yield/fed., and garlic yield quality parameters at harvesting time. In conclusion, the detrimental effects of salinity stress can be alleviated by stress tolerance-inducing compounds, such as yeast extract and proline with proper application rate of K fertilization during the growing season of garlic crop.
The main aim of this study was to evaluate the effectiveness of nano-priming application on seed germination of maize under salt stress. Zea mays L. seeds were primed in saline water (6.5dsm -1 ) and mango peels nanoparticles (nMPs) at concentration of 1000mg/L. Nanoprimed and non-primed seeds were germinated in petri dishes with two round filter papers moistened with 5 ml distilled water and with 10 ml solutions of 5 salinity levels (0, 2.5, 6.5, 9.5 and 12.5 dSm −1 ). Increasing salinity levels significantly diminished radicle and plumule length, seedling fresh-dry weights, germination percentage and vigor index. Priming seeds in nMPs and saline water significantly improved germination percentage, vigor index, radicle, plumule length and total fresh weight. Such findings may serve as in vitro selection criteria for ameliorating salt stress in maize plants.
Salinity stress has a harmful effect on almost all cucumber growth stages especially germination stage. For this, nutrient seed priming in nanofertilizers may be a promising approach to cope the deleterious effects of salinity on plant growth and development. The present study aimed to evaluate the effect of cucumber seed priming in synthesized nanofertilizers under salt stress conditions. Cucumber (Cucumis sativus. L) seeds were primed in fresh water, bulkfertilizers of (NPK), and nanofertilizers (50%, 25%, and 12.5%) as a percentage of bulk fertilizers. Five salinity levels (freshwater: sea water) (0.7, 2.5, 5, 7.5, and 10dSm -1 ) were used to irrigate seedlings for 7 days. Obtained results revealed that increasing salinity levels significantly diminished radicle and plumule lengths, seedling fresh and dry weights, germination percentage, radicle surface area, radicle length reduction/ increase (RLR%), salt tolerance and vigor index. In contrast, the radicle radius was increased. Priming seeds in nanofertilizers improved percentage of seed germination, lengths of radicle and plumule seedlings, fresh and dry weights of seedlings, radicle surface area, RLR%, salt tolerance, and vigor index, while decreased radicle radius compared to fresh water and bulk fertilizers. Occurred results lead to concluded that, priming seeds in nanofertilizers decreased the harmful effect of salinity and it was successful technique in alleviating salt stress in cucumber seedlings through germination stage.
A pot experiment was carried out under greenhouse conditions to test the reaction of different wheat genotypes to salt stress. The seeds of 15 wheat genotypes were grown in pots containing sandy loam soil and later on the seedlings were subjected to 3 levels of saline irrigation water after 2 weeks of seed germination. The selected wheat cultivars included
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