Influenţa stresului salin asupra conţinutului de acid ascorbic (vitamina c) din fructele unor genotipuri de tomate din Nord-Estul României

Vitamin C or ascorbic acid is an organic acid with antioxidant properties, involved in a number of processes taking place in living cells. Through their efforts to adapt to the saline stress, plants have to increase the antioxidant level by increasing, mainly, the ascorbic acid. The research was conducted under greenhouse condition. The biological material was represented by seven local tomatoes populations collected from areas with saline soils from Moldavia region and compared with commercial type salt-tolerant tomato.Tomato genotypes in the study were subjected to salt stress for a period of 30 days is constantly wetted with saline solution to a concentration of 100 mM and 200 mM.The content of vitamin C in fruit was determined by using the titrimetric method. The research on the vitamin C content from tomatoes fruit showed that, as the concentration saline increases, the concentration of ascorbic acid raises too

The effect of biostimulants on the process of photosynthesis at the lettuce

This study followed the effect of two organic biostimulants on the photosynthesis process in two salad varieties grown in the greenhouse. At the same time, the aim was to establish the most effective way to apply biostimulants to increase production. Application of growth regulators was done every ten days by foliar spraying and root application. The first application being made at the appearance of the first leaves, and the last application was made ten days before harvest. The biostimulants used in this study were Wuxal Ascofol with a high content of algae extract and Black Jack based on humic acids. The photosynthesis process was evaluated by determining the total chlorophyll content and by evaluating the content of photosynthetic pigments in the leaves. The study showed that the applied organic treatments stimulated the photosynthesis process in both varieties of salad, which was correlated with an increase in head of salad. Chlorophyll content of 431 nm and chlorophyll b 453 nm, components of the absorption center that capture light energy and transfer it to the reaction center recorded the highest values in the variant treated with Wuxal Ascofol, which shows an intense transport of assimilated to foliar system. It was also noted that the foliar application of biostimulants to lettuce gives much better results than the application at the root level

The action of growth regulators on the process of photosynthesis in tomato plants

This research was conducted to determine the effects of two biostimulants on photosynthesis processes of two tomato cultivars, in greenhouse conditions. This study was carried in 2021 at the ICAM Iasi under greenhouse condition. The biological material was represented by two tomato cultivars (Drорs and Chiquitа). The bifactorial experience was conducted in a pots experiment in randomized blocks with three repetitions. The application of biostimulants (Bactamil and Agromax-Cap) was done every seven days by foliar spraying throughout the vegetation period. Research was focused on the influence of biostimulants on the photosynthesis process. It has been shown that the chlorophyll content of the leaves is closely related to the mineral nutrition of the plant. The value of chlorophyll content increases with the amount of nitrogen in the leaves, which is why the high values indicated by SРАD show a healthy growth from a nutritional point of view. Plants treated with biostimulants had higher values of the total chlorophyll content compared to the control group, which demonstrates an intensification of the photosynthesis process. The yield of the Agomax – Cap stimulator gives better results in terms of the increase in chlorophyll content in the varieties studied and as a result, will also increase the production efficiency.

The action of growth regulators on the process of photosynthesis in sunflower

One of the main physiological processes that are directly influenced by the action of biostimulants and which has a decisive factor in the quantity and quality of the crop is photosynthesis. That is why our study aimed to establish the main ways in which growth regulators intensify the process of photosynthesis. We followed the effect of some biostimulants on the intensity of the photosynthesis process in the sunflower crop, a crop that in recent years has remained in the top of UE countries with the largest cultivated land areas but also with high yields. The study was performed on the NK NEOMA sunflower hybrid, and the treatments were done with the biostimulants Atonik and Terra - Sorb in a concentration of 0.3%. Two treatments were made in two different phenophases: at the formation of the floral botton and before flowering. The evaluation of the intensity of the photosynthesis process was performed by: determining the total chlorophyll content (CCI) and by determining the content of photosynthetic pigments in the leaves, maintaining an interval of 7 days from the application of biostimulants. The results showed an intensification of the photosynthesis process in the flowering phenophase I for the variants treated with biostimulators. The group of plants treated with Terra Sorb is noted with the highest value, which coincides with the higher number of leaves/per plant recorded in the second phenophase studied. The obtained results demonstrate higher values of the chlorophyll a content for the variants treated with biostimulants, in both phenophases, the control group registering lower values

Biostimulants effects on photosynthesis process to basil plants

Biostimulants are natural or synthetic substances that can be applied to seeds, plants, and soil. These substances cause changes in vital and structural processes in order to influence plant growth through the improvement of tolerance to abiotic stresses and increase seed and/or grain yield and quality. In addition, biostimulants reduce the need for fertilizers. Sweet basil is one of the most widespread spices in the world. Its dried leaves are used commonly as a flavoring in many food products. Biostimulants have the capacity to improving quality and quantity of essential oils from basil plants by stimulating physiological processes such as photosynthesis. This research was conducted to determine the effects of two biostimulants on photosynthesis processes of two basil cultivars, in greenhouse conditions. This study was carried in 2021 at the ICAM (Research Institute for Agriculture and Environment) Iasi under greenhouse condition. The biological material was represented by two basil cultivars (Ocimum citriodorum and Ocimum basilicum var. gigante napoletano). The bifactorial experience was conducted in a pots experiment in randomized blocks with three repetitions. The application of biostimulants (Bactamin and Terra-Sorb) was done every seven days by foliar spraying throughout the vegetation period. Research was focused on the influence of biostimulants on the photosynthesis process. Plants treated with biostimulants had higher values of the total chlorophyll content compared to the control group, which demonstrates an intensification of the photosynthesis process. The yield of the Bactamin stimulator gives better results in terms of the increase in chlorophyll content in the varieties studied and as a result, will also increase the production in essential oil

Research on the influence of climate change on the photosynthesis process in maize

The general objective is the study of the photosynthesis process in corn plants, the necessary basis for the great adaptation capacity of plants to climate changes. These studies are important because they participate in the identification of solutions involved in increasing corn production and its quality. The experience was organized at the farm "Vasile Adamachi" within the USV Iasi, in the spring of 2021 and the analyzes on the collected physiological material were carried out in the plant physiology laboratory of the USV Iasi. The research material was represented by the hybrid DKC 4598 produced by the Bayer Group with the FAO 350-390 group. The analysis of the photosynthesis process in maize in the context of the climatic conditions specific to the growing season of 2021 was carried out by quantitatively determining of the content of photosynthetic pigments and chlorophyll fluorescence. The results obtained by the analyse of the photosynthesis process were correlated with the production obtained. The results obtained from the fluorescence analysis show us that the corn plants studied had the highest light quantification capacity in the 6 and 8 node phenophases. The recorded differences do not show an effort in the ability of the plants to adapt to the weather conditions of 2021 in North-Eastern Moldova