Relevance. Medicinal properties of celery (Apium graveolens L.) are connected to the most extent to high antioxidant status of plants.Material, methods and results. Comparative evaluation of polyphenols, ascorbic acid, flavonoids and photosynthetic pygments by leafy, stalk and root celery types, grown in similar conditions on experimental fields of Federal Scientific Center of Vegetable Production revealed several peculiarities, typical to each form. Antioxidant activity (AOA) of seeds, leaves and petioles composed a ratio: 2.7:1.74:1 for leafy form, 2.88:1.99:1 for stalk form, while root celery AOA of seeds, leaves, roots and petioles was characterized by a ratio 3.66:2.78:1.42:1. With practically no differences in leaves ascorbic acid content between different celery forms leaves:petioles ratio for ascorbic acid reached (5.31-5.57):1 for leafy and stalk forms whereas vitamin C distribution between leaves, roots and petioles of root celery was characterized by a ratio 8.1:1.1:1. Phenolics seeds:leaves:roots:petioles accumulation ratio for root celery was equal to 1.77: 1.77: 1.33:1, whereas leaves/petioles distribution of phenolicss in stalk andleafy forms reached 1.86:1 and 1.64:1 accordingly. Polyphenols content in seeds of leafy celery was 1.4-1.5 times lower than in leaves, contrary to stalk and root celery with equal concentrations of phenolics in seeds and leaves. Leaves/petioles ratio of flavonoids was the highest for Elixir (2.87) and Atlant culivars (2.41). Root and leafy celery Samuray cv demonstrated 1.54-1.71 appropriate values. The highest chlorophyll a and b content was typical for root celery. Celery antioxidant system was characterized by positive correlations between ascorbic acid, flavonoids, phenolics, zinc and total AOA and also between the AOA ratio seeds/petioles and leaves/petioles (r=+0.99; P<0.001) and a negative correlation between chlorophyll and phenolics and flavonoids accumulation levels. High nutritional significance of root celery leaves was estimated.

The advantages of pre-sowing seed soaking in phytoregulator solutions such as Hitofos, Phytohit, Cytohit and some foliar feeding were shown at the time of carrot plants grew. As it was revealed previously at Breeding Production Stations, Urus-Martanovskiy region, the «Gribovchanin» carrot cultivar had a yield characteristics and quality of root that became much higher after seed and plant treatment by physiologically active substances.

The bright yellow flowers are edible pumpkin - a good source of antioxidant compounds . The maximum level of  hydroxycinnamic acids  noted  in  the  half  parted flower . The remaining components were studied at the maximum in the unopened buds .  By the beginning of the flower opens flavonoids and carotenoids concentration  decreased gradually .  In  full disclosure of  the flower phase of the content of these components increases again, but it did not reach the initial level. A similar, but  less  pronounced  trend  of  the  observed and chlorophyll .

In recent years much attention is given to the search for new medicinal plants and an elaboration of preparation from plant raw material that is used in ethnomedicine  and for  production  of biologically active compounds (BAC). The forest herbaceous plants from Raifskiy district in Volgo-Kama National Park, and group of weed plants from urban and suburb places were exanimated for BAC content. In the group of herbaceous plants the flavonoid content varied from 1.10 to 15.85% in dry matter; the sum of chlorophylls content varied from 1.13 to 3.59 mg/g of dry matter. Among plant species exanimated: stone bramble, European wild ginger, eagle fern and white goosefoot were not regarded as pharmacopoeial plants, but they were characterized by significantly high content of flavonoids 2.74-4.26%.  Flavonoid and chlorophyll  contents  in the tissues of observed plants changed during of process  of  ontogenesis  in  most  species  and were highest in the phase at the beginning of flowering and during flowering time. It was shown that antioxidant and flavonoids contents increased while manmade load rose as noticed in birdweed (Polygonum aviculare L.). Thus, the examined different species of herbaceous plants can be regarded as promising sources of BAC.