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The precises pot experiments were carried out in 1991 and 1992 year'. The mineral fertilization was the factor which affected crop of seeds, mass of shoots, seeds vessels and roots of Oenothera paradoxu Hudziok. The experiments showed that the highest crop of Oe. paradoxa raw material was obtained by using of nitrogen and in the next tum by combinations of nitrogen with other mineral elements (P, K, Ca and Mg). The content of y-linolenic acid of Oe. paradoxa seeds was differed under the influence of the mineral elements (7.7-8.3%). In spite of it the growth or reduce of yield of oil and 7-linolenic acid depended more on the high of the crops of Oe. paradoxa seeds than on the variants of mineral fertilization.
The paper shows changes in seeds germination of Oe. pciradoxa Hudziok during vernalization. The investigations included seeds from which substances were and were not rinsed with water.'The rinsed seed germination during the 42 days long period of vernalization remained unchanged (only after 21 days vernalization the germination was significant higher), whereas in the latter germination decreased considerably from 3 to 14 days and after 21 days of vernalization. The hypothesis has been suggested about germination inhibitor present in seeds, which is removed from seeds during rinsing with water or vernalization. The studies carried out on the influence of the temperature range from 15 til) 35°C on seed germination after 21 days of vernalization. Showed that, also the temperature 15°C auctally retarded germination yet, it did not decrease the final seed germination. The temperature 35°C, in comparison with temperature range from 15 till 25°C, decreased significantly germination of the Oe. paradoxu Hudziok seeds stored one month after vernalization and non-rinsed seeds investigated immediately after vernalization.
Anatomical and palynological features of E. algidum Bieb., E. palustre L., E. ponticum Hausskn., E. confusum Hausskn., E. hirsutum L. and E. montanum L. collected from NE Anatolia were examined and evaluated by numerical analysis in order to determine the taxonomic value of the observed internal peculiarities. Features related to pollen shape and ornamentation, idioblast distribution, number of palisade parenchyma rows and the presence and distribution of sclerenchyma fibers were found to be important in separating the examined taxa. Principal component analysis showed that the anatomical characters are more important than the palynological ones in explaining the total variation among the examined taxa.
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