The effect of temperature during seeds germination of some species of Umbelliferae vegetable crops has been studied. There is a different reaction of vegetable crops on the temperature factor: depending on crops and temperature, the number of days until the maximum rate of growth can varied from 7,6 to 22,8 days, and percentage of germinated seeds can varied from 7% to 88%. The effect of temperature on growth of seeds embryo has been studied in different crops. The «degree of underdevelopment of embryo» (DUE) characterized the morphological and anatomical features of embryo varied from 13 to 52%. The temperature coefficient (Q10) for the rate of germination of seeds of vegetable crops of Umbelliferae was 1,23 - 1,82.

Experiments were carried out at FGBNU VNIIO in 20112016. The aim of the study was to analyze the influence of different types of organic dormancy caused by various factors on seed quality of some representatives of umbellifer crops. The objects of the study were seeds: parsnip ‘Kulinar’ (Pastinaca sativa L.); carrot ‘Rogneda’ (Daucus carrota L.); root parsley ‘Ljubasha’ (Petroselinum crispum (Mill.) Nyman ex A.W. Hill.); root celery ‘Kupidon’ (Apium graveolens L.); coriander ‘Yantar’ (Coriandrum sativum L.) and dill ‘Kentavr’ (Anethum graveolens L.). In all seeds studied, the speed of embryo growth was decreased by 30% or0.03 mma day. Under influence of the induced dormancy caused by incubation in extract from dill seeds, the speed of embryo growth in all species was decreased by 94-97% on average. The process of germination of just picked seeds in all crops studied showed itself in reduction of germinated seed number by 54% as compared with control variant. Under the effect of incubation at high temperature the seeds of parsnip and root celery didn’t germinate, whereas the germination in the seeds of coriander, root parsley and carrot was decreased by 51%, 47% and 46%, respectively as compared with control. There is no germination observed in parsnip, carrot, root celery and coriander under influence of induced dormancy caused by incubation in extract from dill seeds. In this case, the germination of seeds of root parsley and dill was 8.1% and 15%, respectively. The Pearson correlation between the speed of embryo growth and percent of seed germination showed the significant and positive relationship in the range 0.706-0.952. Analysis of variance (ANOVA) showed that induced by temperature or allelopathic dormancy had impact on the speed of embryo’s growth in the crops studied, where factor effect was 89-86% depending on type of dormancy. Analysis of variance between the factors of dormancy and germination revealed that all types of dormancy analyzed had much influence on germination in these crops. The factor effects for primary, temperature induced, and induced allelopathic dormancy were 98% (F=1590.3; P=< 2x10-16), respectively.

In condition of Ramenskyi district (Moscow region) there was wide spreading of minstrel bug (Graphosoma lineatum L.), which is cause of yield loss of vegetable crops of Umbelliferae family. It was found up to nine mature insects per one plant. The larvae and imago feed mainly on buds, flowers, and seeds in all stages of its development. Because of damaging the seed productivity is decreased by 11-45%, the weight of 1000 seeds is decreased by 12-40%, germination energy is decreased by 13-100%, and germination ability is decreased by 10-82%. The germless seeds can range from 5% to 15 % and seeds without endosperm can range from 7% to 36 %.

The high-temperature stress during 5-20 days has a negative impact on activity of growth of embryo and inhibits the seeds germination of the Umbelliferae crops. The germination of the studied seeds of different species at low temperature contributes to the recovery of the embryo growth; however, growth is less intensive in comparison with the control. All studied Umbelliferae crops showed the differences in seed germination and development of embryos at various tempera6 tures and duration of heat treatment.