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.