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L. sativa L., were investigated as possible sources of genetic variability. L.
saligna L. and L. virosa L. represent only a part of the population related
to L. sativa L. Wild varieties of this species belong to the weed flora. After
crossing, viable achenes were obtained only in the crossing L. sativa L.
x L. saligna L. At initial crossings two populations of L. saligna L. were
used, one with and the other without anthocyanin. The seedlings of L.
saligna L. without anthocyanin were lost after brought out on the field.
In the process of the selection of F1 generation, 31 plants emerged. After
transplantation on the field, only 19 plants survived. In 9 plants the fertility
was provoked by colchicine, but the percentage of fertile achenes was low
as compared to the number of achenes that were not viable. By collecting
more genotypes of the species Lactuca sp. from spontaneous flora in the
locality of Pomoravlje and Sumadija and investigating the possibilities of
crossing with the cultivated lettuce ( Lactuca sativa L.), the selection pro-
grams of this kind would be improved. Eventually, the final aim is to ob-
tain the cultivar with the built-in genes of resistance to virus diseases and
acceptable morphological characteristics (ZDRAVKOVIC et al., 2003b).
Our investigation was based on the problem of anthocyanin and vitamin
C contents inheritance in F 1 progeny of lettuce. It was assumed that prog-
enies with increased contents of these substances could be obtained. Diallel
crossing of eight lettuce genotypes of different anthocyanin and vitamin C
contents, classifi ed into three varieties was performed. Parental and F 1 gen-
erations were investigated comparatively, and their mode of inheritance was
determined. Concerning the inheritance of anthocyanin, dominant genes
prevailed, and a higher content of this substance was succeeded in F 1 gen-
eration. Concerning the inheritance of vitamin C content, dominance mode
of inheritance was recorded, when it was compared to the parents with the
lower vitamin C content. Apart from the dominance mode of inheritance,
signifi cant additive gene effects in inheriting vitamin C content was also
recorded (ZDRAVKOVIC et al. 2002a; ZDRAVKOVIC et al. 2002b).
10.4 CONCLUSION
Irreplaceability of plants in human diet as well as negative urban and in-
dustrial development impact on ecosystems imposes the need for planning
 
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