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Triploids in cucumber: V. The effect of the homo- and heterozygous states on some traits of triploids grown in the field and under cover

Daw A. Sarreb, Henryk O. Mackiewicz, Stefan Malepszy, Elżbieta Bolesta

Department of Plant Genetics, Breeding and Biotechnology
Faculty of Horticulture, Warsaw Agricultural University
Nowoursynowska 166, 02-787 Warszawa, Poland

Triploids of seven cucumber lines in homo- and heterozygous states were compared with each other under two cultivation methods in the field and under plastic cover. The efficiency of obtaining triploids by embryo culture in vitro varied according to the cross. Triploids were stable only in a few cases endopolyploids being detected. General observation indicated that endopolyploids did not differ phenotypically from the pure triploids.

The female flower set varied from homo- to heterozygous lines grown under both conditions. Triploids grown in the field demonstrated stronger femaleness than their analogues grown under plastic cover with a rate 0.04 to 1.9 and 0.2 to 1.2 times greater in homozygous and heterozygous lines respectively. In some cases a small number of hermaphroditic flowers was observed among plants grown under plastic cover.

The length of the main shoot(s) of homozygous plants grown in the field did not significantly differ from heterozygous ones while the number of their main and lateral shoots varied according to the line and cross. However, all homozygous plants grown under cover (except line 601) had shorter main shoots with a smaller number of lateral shoots.

Heterozygous plants set a larger number of fruits with an average 1.1 to 1.8 times greater than homozygous ones. The commercial yield, length, and width of fruits and their soluble sugar content varied. The percentage of fruits with a cavity in the flesh zone and a non-commercial yield did not significantly differ. After open pollination, only a small number of normally developed (plump) seeds were produced.

Sarreb D.A., Mackiewicz H.O., Malepszy S., Bolesta E., 2000. Triploids in cucumber: V. The effect of the homo- and heterozygous states on some traits of triploids grown in the field and under cover. Folia Horticulturae 12/1: 85-98.