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Genetic analysis of selected tomato (Lycopersicon esculentum Mill.) traits in crosses between cultivated lines and the nor mutant

100%

Seroczynska A.

Journal of Applied Genetics

1998

vol. 39

issue 3

259-273

The aim of the study was to investigate the delayed ripening caused by the nor gene and its possible interaction with selected traits observed in two combinations, namely, Dw4 x nor and C36 x nor. The lines Dw4 and C36 differed from each other in the majority of examined characters. There was no significant effect of reciprocal crosses on these characters (total yield, number of fruits, fruit weight, locule number, earliness and fruit shelf life). In Dw4 x nor fruit weight was inherited with incomplete dominance of small fruit, while in C36 x nor the inheritance proved to be intermediate. This important statement made it possible to distinguish the hybrids characterised by fruit weight intermediate in relation to the parental forms. The experiments attested to the high significance of additive effects for fruit weight, periods from sowing to ripening and from flowering to ripening in both combinations and for locule number in Dw4 x nor. It was also found that the nor gene slightly delayed the onset of fruit ripening but did not affect such traits as total yield, number and weight of fruits, locule number and period from sowing to flowering. In its homozygous state the nor gene totally inhibited fruit ripening. However, as a heterozygote it revealed an intermediate action, slowing down fruit ripening and prolonging shelf life 2-3 times as compared with standard tomato. The expression of the nor gene was also found to be dependent on the genetic background. Line C36 positively influenced the flavour and firmness of hybrid fruits, while Dw4 had a negative effect on fruit quality.

Ag-banded karyotypes in six species of jewel-beetles (Coleoptera, Buprestidae)

100%

Karagyan G.

Folia Biologica

2001

vol. 49

issue 1-2

43-47

The male karyotypes of six species of the buprestid genera Sphenoptera (two species) and Acmaeoderella (four species) were studied after Ag-banding. The following karyotypes were found in individual species: n=19-23, with predominance of 23, in Sphenoptera scovitzi Fald., 2n = 24 (22 + Xyp) in Sphenoptera mesopotamica Mars., 2n = 18 (16 + Xyr) in Acmaeoderella flavofasciata Pill. & Mitt., Acmaeoderella gibbulosa Men., Acmaeoderella boryi Brulle, Acmaeoderella vetusta Men. In Sph. scovitzi, two chromosome pairs were found to display stable argentophilous blocks. In Sph. mesopotamica, NOR-bearing is one of the large autosomal bivalents. In all species of the genus Acmaeoderella, a nucleolus-like argentophilous body is placed between the X and y chromosomes.

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1 Folia Biologica

1 Journal of Applied Genetics

1 2001

1 1998

1 Karagyan G.

1 Seroczynska A.

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Genetic analysis of selected tomato (Lycopersicon esculentum Mill.) traits in crosses between cultivated lines and the nor mutant

Ag-banded karyotypes in six species of jewel-beetles (Coleoptera, Buprestidae)