1.Introduction: Several species of Apiaceae family are well known as a source of essential oils which are used for different purposes including nutrition, medicine, beverages, spices, repellents, staining, cosmetics, fragrances and industrial uses. The genus Anthriscus with 12 species growing in Europe, eastern North America, Africa, New Zealand and temperate ragions of Asia, belongs to the family Apiaceae. The chervil plants are generally well known for their strong and distinctive flavors and in some cases providing important nutrients which can fortify the consumer’s diet to enhance its nutritional value. Some of the Anthriscus species are used as flavoring agent and spice for culinary purposes. Wood vinegar is a liquid condensed from carbonized flue gas in producing biochar from agricultural and forestry waste under high temperature and hypoxia. It is a green and environmentally friendly biomass material with sterilization and insect control effects. The conducted analysis demonstrated that wood vinegar contains 10–20 % and more than 200 different types of organic compounds. Better understanding of relations between light quality and plants growth is highly important to produce crops with desired qualitative and quantitative characteristics. There are several studies conducted on the effect of light parameters on crops characteristics, and results have shown that changing the quality and quantity of light can significantly affect physiological, biochemical and productivity of agricultural plants. Studies demonstrated that photosynthesis rate, antioxidant compounds, growth parameters, nutritional value and medicinal characteristics are affected by quality and duration of light radiation. So, in the current study the effect of light quality and wood vinegar application on some of most important characteristics of chervil plant (Antriscus cerifolium) was investigated.   
2.Materials and Methods: In order to investigate the effect of light quality and wood vinegar application on some of most important characteristics of chervil plant, a factorial experiment was performed based on completely randomized design with 4 replications at Department of Horticultural Sciences, University of Mohaghegh Ardabili, Ardabil, Iran. The chervil seeds were sown on growing media (perlite + coco-peat) in plastic pots. Seeds were kept under dark condition for 3 days. After germination, pots were transferred to growing chamber with light intensity of 3000 lux, and 16/8 h day/night photoperiod. Pots were fertigated with hydroponic solution. Plants were subjected to different light quality conditions (white, red, blue, blue + red). Air temperature ranged between 18 to 20 ° Seedlings were sprayed with the concentrations of 0, 0.5 and 1 % of wood vinegar at a 7 days intervals. Morphological and physiochemical traits including survival rate, fresh weight, chlorophyll content, phenolic compounds, flavonoid content and antioxidant activity were evaluated after 4 weeks. Analysis of variance and mean comparisons (based on LSD test at 5 % probability level) were performed by SAS software.
3.Results and Discussion: Results showed that physiological and biochemical traits of chervil plant were significantly affected by light quality and wood vinegar application. According to the results, there was significant difference between plants treated with different wood vinegar concentrations and light qualities with respect to fresh weight, antioxidant activity, phenol content, flavonoid content, chlorophyll a and b content and survival rate. Results demonstrated that the highest survival percentage was for plants grown under white light condition (100 %). On the other hand, the lowest value of this trait was recorded in plants grown under blue light condition (13 %). Treatment with wood vinegar at the concentrations of 0.5 and 1 % led to a significant increase in survival rate of plants exposed to white light (33 %) and blue light (20 %). Results of the current study indicated that wood vinegar acted as a bio-fertilizer and improved different characteristics of chervil plant under different light quality conditions. Based on reports, wood vinegar has complicated structure, but phenols and acids are its main components. These compounds reduce the intracellular pH, increase cell activity and enhance plant growth. Some studies demonstrated that wood vinegar can act as a hormone-like compound with different effects on molecular and biochemical pathways of plant cells. Under different treatments of wood vinegar, the plants grown under white light condition showed the highest fresh weight. Also, the lowest fresh weight was recorded in control plants grown under blue light condition. Generally, treatment with wood vinegar at concentrations of 0.5 and 1 % increased plant fresh weight under different light qualities.
4.Conclusion: as described above, light quality affected the growth and biochemical performance of chervil plant. Results also showed a positive effect of wood vinegar on alleviating adverse effect of light stress under controlled condition.