It was investigated the content of pigments in the leaves of species of the genus Hemerocallis L.: H. aurantiaca, H. citrina, H. dumortieri, H. esculenta, H. exaltata, H. fulva, H. graminea, H. lilioasphodelus, H. middendorffii at different phases of development under natural moisture. It was common to daylilies increase in the chlorophylls amount in the period of budding—beginning of flowering (up to 3,6—5 times in H. middendorffii) and a substantial its decrease at the end of development, with simultaneous increase in the level of carotenoids in the total balance of photosynthetic pigments. During budding and until the end of flowering for most species it was determined more intensive increase in chlorophyll b, as well as the content of chlorophyll a at the end of the growing season. The chlorophyll b part increased at the end of the growing season in H. aurantiaca, which in our climate conditions changing the phenoritmotype from evergreen on half-asleep. For H. fulva, H. esculenta, H. exaltata, H. graminea and at the end of growth it was typical a decrease in the quantity of both main and auxiliary pigments (40—60 %), which indicates a significant sensitivity of species and «stage of exhaustion». At the same time at the H. middendorffii, H. lilioasphodelus, H. aurantiaca and H. dumortieri, with a decrease in total chlorophyll content at 20—25 %, significant changes in the amount of carotenoids were not recorded. At the end of development in H. citrina the content of chlorophyll did not differ significantly, and the level of carotenoids was 120 % as compared to the initial phase of development, that indicates a high level of resistance of this species at introduction under the conditions of a steppe zone of Ukraine.
Keywords: Hemerocallis L., photosynthetic pigments, phase of development, drought
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